Estimated Accuracy of Calibration

of Some Membrane-Type LSMG

Transport Tanks

W. C. Haight, R. J. Hccken, B. R. Borchardt, C. L. Carroll,

R. G. Hartscck, C. P. Reeve, F. E. Scire and R C. Veale

Automated Production Technology Division

National Engineering Laboratory

U.3. Department of Commerce

National Bureau of Standards

Washington, DC 2C234

February 1 280

Issued January 1 381

/ W \

o \

f ]_QQ

3E PA RTMENll)F COMME RC

E

. U56

80-2141

1981

c l

MAL BUREAU OF STANDARDS

National Bureau of standards

Library, £*01 Admin. Bldg.

APR 1 1981

NBSIR 80-2141

noESTIMATED ACCURACY OF CALIBRATION

OF SOME MEMBRANE-TYPE LNG

TRANSPORT TANKS

mo

t.*

W. C. Haight, R. J. Hocken, B. R. Borchardt, C. L. Carroll,

R. G. Hartsock, C. P. Reeve, F. E. Scire and R. C. Veale

Automated Production Technology Division

National Engineering Laboratory

U.S. Department of Commerce

National Bureau of Standards

Washington, DC 20234

November 1 980

Issued January 1981

U.S. DEPARTMENT OF COMMERCE, Philip M. Klutznick, Secretary

Jordan J. Baruch, Assistant Secretary for Productivity, Technology, and Innovation

NATIONAL BUREAU OF STANDARDS, Ernest Ambler, Director
6id :a . , U!ti » 4 .iiciti; ;

;

,i. fO-i .i'o

rser « «qA
Estimated Accuracy of Calibration of

Some Membrane-Type LNG Transport Tanks

W. C. Haight, R. J. Hocken, B. R. Borchardt, C. L. Carroll,

R. G. Hartsock, C. P. Reeve, F. E. Scire and R. C. Veale

Automated Production Technology Division

National Engineering Laboratory

National Bureau of Standards

Washington, DC 20234

February 1980

These reports prepared for:

The LNG Custody Transfer Measurements Committee

and

The Maritime Administration of the

Department of Commerce

Table of Contents

Section Title Page

I. Introduction 1

II. The Tanks 1

III. Tank Calibration Methods 1

IV. Results 2

References 3

Appendices: Tank Calibration Reports

A. Calibration Reports for the Six Tanks A-l

of the El Paso Southern

B. Calibration Reports for the Six Tanks B-l

of the El Paso Arzew

C. Calibration Reports for the Six Tanks C-l

of the El Paso Howard Boyd

Estimated Accuracy of Calibration of

Some Membrane-Type LNG Transport Tanks

W. C. Haight, R. J. Hocken, B. R. Borchardt, C. L. Carroll,

R. G. Hartsock, C. P. Reeve, F. E. Scire and R. C. Veale

I. Introduction

The National Bureau of Standards supported by the Department of Commerce

Maritime Administration did some preliminary studies to establish an upper

limit for the tank volume uncertainty of a spherical transport tank calibrated by photogrammetry [1]. Additional support from the Maritime Administration and the LNG Ship Custody Transfer Committee [2], has made possible

a considerably expanded study of the calibration uncertainties of LNG

transport tanks. The tank calibrations examined in this work are those of

the three LNG Transports built by Newport News Shipbuilding and Drydock

Company for El Paso Marine Company.

II. The Tanks

3 The cargo tanks on these 125000 m (approximate) capacity ships are membrane types of the Technigaz design described in reference [3]. The tanks

are ten-sided prismatic solids and rectangular in horizontal cross section.

The walls are all plane surfaces. The end walls are vertical as are the

side walls. The side walls are connected to the horizontal floor and ceiling

by sloping chine planes. All eight of the longitudinal planes are parallel

to the longitudinal axis of the ship. The supporting walls of the tanks

are the inner hull of the ship. Layers of insulation are attached to these

walls and the internal surfaces of the insulation are covered with a liquidtight 1.2 mm stainless steel membrane. This membrane has corrugations

stamped into it forming a waffle pattern.

III. Tank Calibration Methods

The measurements used to calculate the tank volume were generally made

after the membrane installation was complete but before the removal of the

construction scaffolding since it is needed to provide access to the tank

surface. Briefly, the calibration method used by the calibration contractor

consisted of measuring horizontal cross sectional areas of the tank at

intervals from the bottom to the top of the tank. The products of these

areas and the separation from the area immediately below summed to the

level gives the volume to that level. This method is discussed in reference [4], The cross sectional areas of these tanks were determined by

measuring short distances to the wall from the sides of a horizontal rectangle of known dimensions defined by laser beams.

A calibration method developed at NBS and reported in reference [5] was used by NBS to assess the accuracy of the method used by the calibration

contractor. The method used by NBS consists, in brief, of inscribing with

laser planes a slightly smaller closed volume with the same shape as the

tank. The dimensions of this laser-plane-defined volume are accurately

measured. Perpendicul ar distances from the laser planes to the tank walls

are measured at several hundred specified points distributed around the

tank. The integration method used to determine volume as a function of

height is also outlined in reference [5].

1
IV. Results

The calibration reports for each of the six tanks of the three ships, the

El Paso Southern, the El Paso Arzew and the El Paso Howard Boyd, appear in

Appendix I, II, and III respectively. Each individual tank report supplies

the following information:

a. A calibration report or a report of test describing the measurement

technique, measurement conditions, and error estimate.

b. A summary main gaging table showing tank volume as a function of gage

height.

c. Summary list and trim correction tables to supplement the main table

under expected conditions of ship list and trim.

d. A plot comparing the NBS main gaging tables at selected intervals to

the gage books for each tank provided by the calibration contractor.

The staging was removed in four of the tanks before the NBS measurements

were made; hence the calibration check was done only to the height accessible

from the bottom of the tank.

The calibration accuracy required by the ship owner is +0.2% of total tank

volume. The NBS results range in accuracy from +0.05% to +0.1% as indicated

in the Reports of Calibration. In every case, the calibration contractor's

results are well within +0.2% of the NBS results. It therefore appears that

the accuracy requirement has been achieved for the tanks at ambient temperature.

The tank volume tables at ambient temperature are used by the transporter to

determine LNG volume at operating temperature because the tank dimensions have

been assumed independent of cargo temperature. This assumption is based on the

fact that the shape of the tank is determined by the external tank wall which is

the inner hull of the ship. The membrane wall is supported by this wall via

the insulation. The corregated design of the membrane allows the membrane to

shrink on cooling without altering the internal volume.

In actual operation, the external tank wall might be as cold as 0°C depending

on weather conditions. The temperature of the interior of the tanks was as high

as 30°C during calibration of the tanks. Provided the external tank wall reached

temperatures that high, the difference between the calibration and operating

temperature could be as large as 30°C.

The thermal expansion coefficient of iron as well as^iron containing small

quantities of nickel [6] is approximately 11.6 x 10 m/m°C. This contraction

only affects the length and width of the tank with regard to calibration since

the liquid height is determined by the level gage rather than the tank height.

Thus the tank volume change between the calibration and operating temperature

could be as much as

AV/V =- (2 X 30 X 11 . 6)/l 00

=-0.07%

2
The shrinkage af the balsa wood insulation upon cooling (since the balsa is

not a rigid body) as well as any bulging of the tank sides counteract the

reduction in volume due to cooling the walls. The balsa shrinkage contributes

a negligible change in tank volume. If this is also true with respect to tank

wall bulging due to hydrostatic head, then the maximum systematic error introduced into the tank calibrations due to coolina is estimated to be no more than

-0.07%.

References

[1] Jackson, R.H.F. et al. 1979. Custody Transfer Systems for LNG Ships: Tank

Survey Techniques and Sounding Tables. NBSIR 79-1751.

[2] The members of the committee are: Ivan W. Schmitt, Chairman, El Paso

Marine Company; Bland Osborn, Columbia LNG Corporation; Howard S. Joiner,

Consolidated Systems LNG Company; and Ed Crenshaw, Southern Energy Company.

[3] Jackson, R. G. and Kotcharian M., 1968, Testing and Technology of Models of

Integrated Tanks for LNG carriers. Paper No. 35, Session 6, First International

Conference on LNG, Chicago, April.

[4] Jelffs, P.A., 1972. "Calibration of Containers and Gages" J. Inst. Pet.

Vol . 58, p. 117.

[5] Hocken, R. J. and Haight, W. C., 1978. "Multiple Redundancy in the

Measurement of Large Structures" Annals of the International Institution of

Production Engineering Research (CIRP), Volume 27, p. 1.

[6] LNG Materials and Fluids User's Manual, 1977. D. B. Mann, Editor, National

Bureau of Standards, Boulder, CO.

3

Appendix A

Calibration Reports for the Six Tanks of the El Paso Southern

A-l
FORM NBS-441

(REV. 12-45)

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANDARDS

WASHINGTON, D.C. 20234

REPORT OF CALIBRATION

For: Tank #1 on the LNG Tanker

El Paso Southern

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 1 of the liquefied natural gas tanker El Paso Southern while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull. Both the measurement method

and the computational algorithms are outlined in the paper "Multiple Redundancy in the Measurement of Large Structures," Annals of the International

Institution of Production Engineering Research (CIRP), Volume 27/1, 1978.

The tank was measured empty while at an average temperature of 9.0°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

The measurement method used includes geometrically redundant cross checks

which allow assessment of the random error in the measurement process. For

this tank, the total volume, excluding the vapor domes, was 12566.0 nr with

an uncertainty of 1.3 m^ (0.01% of total volume) at the three standard

deviation limit of random error. Including an analysis of probable systematics by adding the absolute magnitude of the error sources, we estimate

that the total uncertainty, at the 99% confidence level, is + 0.05% of the

total volume. No estimates of the errors in the individual table entries

are included, since without an estimate of the height error introduced by

the liquid level gage such estimates would of necessity be incomplete.

For the Director,

Rufssell D. Young, CbjSef ^

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: August 17, 1979

A-2
EL PASO SOUTHERN

MAIN VOLUME VS. HEIGHT TA8LE

TANK NO. 1

GAGE HEIGHT VOLUME

(METERS) (CUBIC METERS)

0.000

. 050

. 100

.200

• 30 0

. LOG

.500

1.000

2.000

3.000

4.000

5.000

6.000

7. 0C0

3 • 0 C 0 9.GC0

1C. 000

11.000

12.000

13.000

14.000

15.000

16.000

17.000

18.000

19.000

20.000

21.000

22. COO

22.500

23.000

23.500

24.000

24.500

25.000

25.5QC

3.3

13.6

34.4

66.5

99.0

132. 0 165.5

339. 9

724.3

1156.1

1 635.1

2144.

7

2654.7

3164.

7

3674.7

4184.

7

4694.

6

5204.5

5 714,4

6224.3

6 73 4.1

7243.9

7753.6

8263.3

8773.

C

9282.7

9792.3

10 301.

9

10311.4

11 C 66.

2

11321.0

11575.7

11825.6

120 6 3. 7

12289.8

12504.

1

A-3
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A-4
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limits.
FORM N&S-U1

(REV. lt~*S)

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

WASHINGTON, D.C. 20234

REPORT OF CALIBRATION

For: Tank #2 on the LNG Tanker

El Paso Southern

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 2 of the liquefied natural gas tanker El Paso Southern while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull. Both the measurement method

and the computational algorithms are outlined in the paper "Multiple Redundancy in the Measurement of Large Structures," Annals of the International

Institution of Production Engineering Research (CIRP), Volume 27/1, 1978.

The tank was measured empty while at an average temperature of 15.4°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

The measurement method used includes geometrically redundant cross checks

which allow assessment of the random error in the measurement process. For

this tank, the total volume, excluding the vapor domes, was 24858.8 nr with

an uncertainty of 2.5 m^ (0.01% of total volume) at the three standard

deviation limit of random error. Including an analysis of probable systematics by adding the absolute magnitude of the error sources, we estimate

that the total uncertainty, at the 99% confidence level, is + 0.05% of the

total volume. No estimates of the errors in the individual table entries

are included, since without an estimate of the height error introduced by

the liquid level gage such estimates would of necessity be incomplete.

For the Director,

L&dk

Russell D.

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: August 17, 1979

A-6
EL PftSO SOUTHERN

MAIN VOLUME VS. HEIGHT TA8LE

TANK NO. 2

GAGE HEIGHT

(METERS)

VOLUME

(CUBIC METERS)

0.000 4.5

.050 43. 1

.100 84.0

• 200 166.1

. 300 243.9

• 400 332.3

.500 416.3

1.000 846. 0 2. 000 1752.4

3.000 2721.8

4.000 3754.1

5.000 4827.4

6.000 5901.4

7.000 6975.5

3.000 8049.5

9.000 9123.5

10.000 10197.5

11. GOO 11271.5

12.000 12345.5

13.000 13419.4

14.000 14493.4

15.000 15567.3

16.000 16641.3

17.000 17715.2

18.000 18773.

7

19.000 19734.5

20. 00C 20726.8

21.000 21605.4

22.000 22420.4

22. 500 22804. 1 23.000 23171.9

23.500 23523.8

24.000 23859.8

24.500 24179.9

25.000 24484.1

25 • 50 Q 24772.4

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FORM NK5-U4

(REV.

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

WASHINGTON, D.C. 20234

REPORT OF CALIBRATION

For: Tank #3 on the LNG Tanker

El Paso Southern

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 3 of the liquefied natural gas tanker El Paso Southern while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank’s capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull. Both the measurement method

and the computational algorithms are outlined in the paper ."Multiple Redundancy in the Measurement of Large Structures," Annals of the International

Institution of Production Engineering Research (CIRP), Volume 27/1, 1978.

The tank was measured empty while at an average temperature of 16.4°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

The measurement method used includes geometrically redundant cross checks

which allow assessment of the random error in the measurement process. For

this tank, the total volume, excluding the vapor domes, was 27655.0 nr with

an uncertainty of 5.5 m^ (0.01% of total volume) at the three standard

deviation limit of random error. Including an analysis of probable systematics by adding the absolute magnitude of the error sources, we estimate

that the total uncertainty, at the 99% confidence level, is + 0.10% of the

total volume. No estimates of the errors in the individual table entries

are included, since without an estimate of the height error introduced by

the liquid level gage such estimates would of necessity be incomplete.

For the Director

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: August 17 , 1979

A- 1 0
EL PASO SOUTHERN

MAIN VOLUME VS, HEIGHT TABLE

TANK NO. 3

GAGE HEIGHT VOLUME

(METERS) (CUBIC METERS)

0.000

• 050

• 100

. 200

.300

• 4G 0

• 500

1.000

2.000

3. 000

4.000

5.000

6.000

7.000

8.000

9.000

10.000

11.000

12.000

13.000

14.000

15.000

16. 000

17.000

18.000

19.000

20.000

21.000

22.000

22.500

23.000

23.500

24.000

24.500

25.0G0

25.500

1.4

43.1

90.0

184.4

279.5

3 75.2

471.6

963.7

1998.1

3099.5

4267.9

5480.

7

6694.4

7908.2

9121.8

10335.4

11548.

9

12762.4

13975.8

15189.2

16402.

5

17615.7

18823.9

20G3G.7

21170.7

22242.9

23247.4

24184.

2

25053.2

25462.4

25854.

5

26229.8

26533.1

26929.4

27253.9

27561.4

A-n
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00 i 1 1 • 1 1 » • • 1 1 or i t LU i • 1 o 1 ro ro X) OJ ro OJ 33 CM t-4

X

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Vol

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-

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Contractor

Vol.)/Tank

Vol.

Dashed

lines

are

+0.2%

and

“0.2%

error

limits.
FORM NB5-259

(3-ee)

U.S. Department of Commerce

NATIONAL. BUREAU OF STANDARDS

WASHINGTON, D.C. 20234

REPORT OF TEST

For: Tank #4 on the LNG Tanker

El Paso Southern

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 4 of the liquefied natural gas tanker El Paso Southern while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull.

The tank was measured empty while at an average temperature of 10.0°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

These tables are not based on a complete survey of the tank, since

scaffolding necessary for complete interior access was not present at the

time of measurement. As a consequence, geometrically redundant cross checks

reported of tanks 1, 2 and 3 were not made on this tank to assess random

measurement errors. The estimated uncertainty of the tables is instead

based on the comparison of measurements on tanks 1 , 2 and 3 against their

respective nominal construction dimensions. These comparisons showed

measured dimensions were in general within 0.2% of the nominals so an estimated uncertainty of + 0.2% of total volume is assigned to the tables.

For the Director,

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: August 17, 1979

A- 14
EL PASO SOUTHERN

MAIN VOLUME VS. HEIGHT TABLE

TANK NO. 4

GAGE HEIGHT VOLUME

(METERS) (CUBIC METERS)

0.000 0.0

. 350 11.2

. 1QG 23.4

.200 43.0

. 300 72.5

.40 0 97. 0 .500 121.6

A-l 5
i 1 in 1 in r

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A- 16
o

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b.

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Vol

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Vol

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Dashed

lines

are

+0.2%

and

-0.2%

error

limits.
FORM NBS-259

C3-45)

U.S. Department of Commerce

NATIONAL. BUREAU OF STANDARDS

WASHINGTON. D.C. 20234

REPORT OF TEST

For: Tank #5 on the LNG Tanker

El Paso Southern

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 5 of the liquefied natural gas tanker El Paso Southern while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull.

The tank was measured empty while at an average temperature of 6.4°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions . The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

These tables are not based on a complete survey of the tank, since

scaffolding necessary for complete interior access was not present at the

time of measurement. As a consequence, geometrically redundant cross checks

reported of tanks 1, 2 and 3 were not made on this tank to assess random

measurement errors. The estimated uncertainty of the tables is instead

based on the comparison of measurements on tanks 1, 2 and 3 against their

respective nominal construction dimensions. These comparisons showed

measured dimensions were in general within 0.2% of the nominals so an estimated uncertainty of + 0.2% of total volume is assigned to the tables.

For the Director,

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: August 17, 1979

A- 1
EL PASO SOUTHERN

MAIN VOLUME VS. HEIGHT TABLE

TANK NO. 5

AGE HEIGHT

(METERS)

VOLUME

(CUBIC METE

0.000 8.5

.050 37. 8

.100 83.9

.203 178.6

• 300 274.0

• 400 37C.1

.500 466.9

1. 000 960.6

2.000 1993.2

3. 000 3102.5

4. 000 4273.5

A-l 9
GAGE

CORRECTION

IN

MILLIMETERS » Lf\ 1 <0 p^ in o 1 • 1 • • • • 1 ro 1 *J3 O' CM o 1 •¥ 1 in CO J- rl _ 1 1 i 1 t4 CM

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l— 1 • o 1 • 1 • • • • oo 1 1 1 1 t-4 ^-4 CM (T» • LTi 1 t-4 a l0 p». • 4» t P'- in CM

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ct 1 1 1 O' CO CO CO 1 LUX LU 1 in CD o o — 1 1 1 O o t— 1 a CM in 1 1 1 <r H-* IU 1 • • • • 1 A 1 1 o Ld z 1 1 (— tn 1 CO O a o 1 X —

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A-20
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A-21

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=

100*(NBS

Vol.

-

Ca

lib.

Contractor

Vol

.

)/Tank

Vol

.

Dashed

lines

are

+0.2%

and

_

0.2%

error

limits.
form N BS-2S9

(3-«8)

U.S. Department of Commerce

NATIONAL BUREAU OF STANDARDS

WASHINGTON, D.C. 20234

REPORT OF TEST

For: Tank #6 on the LNG Tanker

El Paso Southern

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 6 of the liquefied natural gas tanker El Paso Southern while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank- This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull.

The tank was measured empty while at an average temperature of 3.8°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

These tables are not based on a complete survey of the tank, since

scaffolding necessary for complete interior access was not present at the

time of measurement. As a consequence, geometrically redundant cross checks

reported of tanks 1, 2 and 3 were not made on this tank to assess random

measurement errors. The estimated uncertainty of the tables is instead

based on the comparison of measurements on tanks 1 , 2 and 3 against their

respective nominal construction dimensions. These comparisons showed

measured dimensions were in general within 0.2% of the nominals so an estimated uncertainty of + 0.2% of total volume is assigned to the tables.

For the Director

Russell D. Young, Cha'ef

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: August 17, 1979

A-22
£L PASO SOUTHERN

MAIN VOLUME VS • HEIGHT TABLE

TANK NO. 6

GAGE HEIGHT

(METERS)

VOLUME

(CUBIC METERS)

3.000 • 6

. 050 34.3

. 100 81.1

.200 175.1

• 30 0 269.9

. 400 365.3

.500 461.4

1.000 951.9

2.300 1983.5

3.000 3082.5

4.000 4248.9

A-23
EL

PASO

SOUTHERN

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in 1 N- 1*0 CM j- in • 1 • • • • • •

1*3 • Ja J- <T> O' O' l l in CM CD O CD 1 i CM CM CM 11 1 1 • 1 a •1 U) UJ J- UJ UJ S. • | • • • • • • m I J- (X O' O' O' O' + 1 1 d- N- N. N. 1 i H *4 11 i 1 i 1

in 11 <T> UJ <33 N- i*. N. • | • • • • • « 00 1 J- SO CM O' cn O' * 1 1 J- J- j" -3- 1 < H tH 11 < i 1 » a 11 tO CD <33 *> SO <D • t • <M 1 J- N. CM O' O' O' 1 1 J- CD 1 1 H tH 11 i 1 1 i

in 1t UJ in O' so O' O' • 1 • • • • • • t -T j- UJ O' O' O' + I 1 j- <33 <33 <33 <33 11 < 1 1 1 1

CD 11 J- SO O' O' O' O' • | t • • • • « t-4 » -r O' cn O' O' O'

4r i i nd in in in in il t i 1 i l O i1 1*0 CD a O • a 1 33 1 O CD CD

in i1 <M CD o CD • | • • • • • • o 1 H O CD o a CD 1 1 1*0 1

1*0 1*3 fn 1*3 1*3

CD 11 u> o CD • 1 • -u 1 a CD CD CD CD

O 1 1 UJ 1 UJ U3 U) UJ UJ

in 1t H CM • i • 1 CD CD O O CD CD 1 t O' <T> O' O' O' O'

>— oo

ujx ay CO O UJ

<3 t—< l—

CD UJ UJ X X

a

a o o o o

in cja o a o o -r-c (M ifl o o

•h j- • o 1 O' in t*» O' CsJ O' i • i • • • • • • a | OJ 1 ao UJ O' CM CM

C/3 1 + 1 H O' in

UJ i 1 -*H UJ 1 1 O' 1 1 UJ 1 1 UJ 1 in • UJ S- UJ CO CD U) a i • | • • • • • • *» i 1 UJ J- tH <33 O' <33 • + 1 <33 U) 1*3 O 1 1 cy i 1 <3 1 1 o • t CQ 1 a 1 O' N. UJ <33 O' O'

cy i • 1 • • • • • • <X 1 1 3 1*3 SO t— i I in 1*3 00 I i 1 o » ii b~ 1 LTk l a UJ O' O' o> O' 1 • 1 • • • • • • (— 1 CD • J- u> CO 1 + 1 CM 1 o 1 CM •4 a H o o 1 • 1 • »1 o i n~ i o o CD 11 in i1 -3* m <33 N- N- in 1 • | • • • • • • 1 O 1 CM CM 1 1 1 l 11 i 1 CO 1 11 o 11 CM J- J" 1*3 C\J 1 • | • • • • • • 00 1 H 1 CM CD CD 1 1 1 UJ 1 i 1 UJ j' UJ | 1 ry i 1 O 1 1 UJ 1 in • in <33 O' H CM O' O 1 « | • • • • • • w \ 1 CM O' 1*3 H tH 1 1 1 O' U) 1*3 V— 1 t ay i 1 O 1 1 a. i 1 l CD 1 !*~ J" u> O' O' in O 1 • | • • • • • • U | CM 1 f*3 O ro fO PM i 1 1 CM CD UJ i— i 1 H

CO

00

i- cy

UJX UJ

UJ

O t—

<r

h uj o uj x X — o a

a

a

a

if\ o o o a O i-4 (\J in a

-H JA-24

000
(%) 8 ‘NOIl VI A3Q

E

lI

(D

LU

X

LU

a

<

o

A-25

<5

=

100*(NBS

Vol

.

-

Calib.

Contractor

Vol

.

)/Tank

Vol

.

Dashed

lines

are

+0.2%

and

_

0.2%

error

limits.

Appendix B

Calibration Reports for the Six Tanks of the El Paso Arzew

B-l
FORM N&S-Ui

(REV. U-*»)

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANDARDS

WASHINGTON, D.C. 20234

REPORT OF CALIBRATION

For: Tank #1 on the LNG Tanker

El Paso Arzew

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 1 of the liquefied natural gas tanker El Paso Arzew while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull. Both the measurement method

and the computational algorithms are outlined in the paper "Multiple Redundancy in the Measurement of Large Structures," Annals of the International

Institution of Production Engineering Research (CIRP) , Volume 27/1, 1978.

The tank was measured empty while at an average temperature of 23.0°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

The measurement method used includes geometrically redundant cross checks

which allow assessment of the random error in the measurement process. For

this tank, the total volume, excluding the vapor domes, was 12571.8 m"

v with

an uncertainty of 6.3 m^ (0.05% of total volume) at the three standard

deviation limit of random error. Including an analysis of probable systematics by adding the absolute magnitude of the error sources, we estimate

that the total uncertainty, at the 99% confidence level, is + 0.10% of the

total volume. No estimates of the errors in the individual table entries

are included, since without an estimate of the height error introduced by

the liquid level gage such estimates would of necessity be incomplete.

For the Director,

Russell D. Young, Ch±4f

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: August 16 1979

B-2
EL PASO ARZEW

MAIN VOLUME VS. HEIGHT TABLE

TANK NO. 1

GAGE HEIGHT VOLUME

( METERS) (CUBIC METERS)

Q.000

• 050

.100

• 200

. 300

• 400

.500

1.000

2.000

3.000

4.000

5.000

6.000

7.000

8.000

9.000

10.000

11.000

12. 000

13.000

14.000

15.000

16.000

17.000

13.000

19.000

20.000

21.000

22.000

22.500

23.000

23.500

24.000

24.500

25.000

25.500

2.4

17.8

33.6

65.7

98.3

131.3

164.8

339.3

723.9

1155.8

1634.9

2144.

2

2654.1

3164, 0 3673.8

4183.7

4693.6

5233.4

5713.3

6223.1

6732.9

7242.7

7752.6

8262.4

8772.2

9282.0

9791.8

10 301.6

10811.4

11066.3

11321.2

11576.1

11825.

9

12064.1

12290.4

12504.9

B-3
1 in 1 a CM in 03 CD

H CD r4 ro 1 m t X SO in X 03 r- N- s- r^ f- 1 + 1 CM X) CM J- J- -S’ J" J- J- 1 1 1 1 r0 tH t-4 t-4 r4 W r4 t-4 00 1 • 1 i 1 i i i 1 i i O' 1 1 UJ 1 1 i o 1 in j' O'

X

X ro CM ro CM J- t— 1 1 i • 1 • • • • • • • • • • UJ 1 a 1 X in CD N. N- o tH CD t4 ro i CM 1 O' S3 X X CM CM CM CM CM ro z 1 • 1 • • • • • • • • • • • CO » 4- i j- CM i 1 ro 1 in 03 10

in in

X 03 03 03XX UJ i 1 1 + I CM 03 t-4 CM CM CM CM CM CM CM CM UJ i 1 z 1 1 1 1 t^ T"4 t-4 r4 t-4 t-4 t-4 or i 1 a; 1 1 1 i 1 i • i i i i o i 1 UJ 1 1 UJ i in 1 N. -3 CM CD ro

X

X

X r>-

X

u- 1 1 Q i • 1 00 1 1 w i t-4 1 CM

X s -3- j- T^ t4 T-4

tH t-4 t4 1 in 1 T^ CM CM O' S3 o 4 t-4 CD tH CM i 4- • ro t-4 i >- 1 • 1 Q i 1 en 1 ni 1 in J- CM j- J" in in in in in in CkT i 1 • 1 CM in CD CD CD CD o CD CD o CD <3 i 1 z 1 i 1 i H t-4 t-4 T-4 t-4 T^ t-4 t-4 o i 1 t-4 1 1 < i i i • i < • i CO • o 1 r*» r^ CM t-4 ro CM T^ CM CM t-4 ro ac 1 1 Ct: i • 1 y— 1 1 *3 i 1 «o in CM CM CM t-4 t-H t4 r4 t4 l 1 1 1— i 1 t4 1 a 1 in 03 S3 a <T> O ^4 t-4 CD •r-t t-4 CO » I 00 1 • 1 i 1 QL 1 CM < o CO j- CO j- J- .r J’ j- o i 1 tH UJ 1 1 CM 03 S3 S3 03 03 03 03 03 X X h* t in 1 ~t CD O' X CD X X r^ X X CM K 1 » 1 1 1 1 1 1 1 1 1 1 1 i • 1 • UJ 1 1 y— i a 1 X tH T^ o z 1 < CO i 4» 1 z 1 1 HC • 1 -1 1 in 1 X in O' O' o a H a O -J i 1 v: -1 1 • 1 • • • • • • • • • • • i 1 z h-4 1 1 ro j- CM CM ro PO ro ro fO ro ro « CD • CD CM t4 CD tH tH t-4 t-4 CD t-4 C3

<z z 1 •+- 1 CM in

X 03 03 03 03 03 03

X

X i • 1 i— 1 1 i i I » 1 1 I « 1 1 1 < a 1 a

O i CD t CD z 1 1 i 1 HH 1 1 i 1 3 z t CD 1 O' 03 O' O' O' o t-4 t-4 o t-4 CD i in 1 in T^ CM ro t-4 X s- X X N. a

LlI o 1 • 1 i • 1 fsl h-4 1 H 1 t-4 CD T^ tH CM CM CM CM CM CM • o 1 O' I 1 1 • 1 1 1 i 1 t4

O' *— 1 +• 1 C\J J- j- -* J- J- J- J- J- -3" i « t i <x CO 1 1 1 1 « 1 • 1 1 1 1 t 1 i 1 UJ 1 1 i 1 o or 1 • i • 00 <z 1 1 i a 1 CM 03 o t-4 CM t-4 CM tH CM CM X

<3 o » CD 1 a CM o t4 t-4 t-4 T^ CD t-4 CD A, • • 1 Q_ o 1 • 1 CO i tH 1 N- ro

a i t-4 t-4 t4 r4 t-4 CM 1 CD 1 o a < O i CD UJ i i 1 t-4 i i i i i 1 UJ 1 1 UJ i 1 UJ o C 1 QC • I 1 » (J3 i • o 00 1 in I H H CD CVJ CD t-4 O' T-4 CD O' O UJ i X 1 r*. O' tH X T^ X X X X CD

(V 1 • 1 a i • 1 UJ • o 1 H tH t-4 -4 t-4 CD t-4 t4 CD t-4 *-* i t-4 1 CD ro t-4 t-4 t-4 t-4 t-4 t-4 t-4

X

t— 1 i 1 CM CM CM CM CM CM CM CM CM CM CM i 1 1 ro t-4 i 1 1 i • i UJ 1 1 t— i 1 z 1 » a: » 1 w 1 I o i 1 1 a 1 CD CM r-4 T-4 T"4 O' t4 CD O' O' 0. i 1 3 1 • 1 i O 1 GO ro O t-4 X CM J- CM ro •j- t4 O 1 t-4 » (M CM CM CM CM CM t-4 CM CM t-4 t-4 o i • 1 CO • i 1 J- J- j- J- J” j- H* i CM J -r X X CM CM <M CM CM CM CM GO I » i 1 I j- CM 1 1 • 1 1 i >- 1 1 H i i m 1 1 CO i 1 1 in 1 CO CM t-4 CM CM -H tH tH o 4 O t—4 i <*«* • z 1 • I _i » X 1 -4 1 t-4 1 to ro CO ro ro ro ro ro ro ro ro t 1— IY 1 CD a CD CD CD CD O CD CD CD CD

QC « i 1 x

X lO 03 03 03 03 03

X

XX i Ul

X UJ f X

a CDO CD CD

a CD CD CD CD 1 • i X X V— 1 CD tH CM X CD O o CD CD CD CD 1 • i <r l—t UJ 1 1 1 i o Ul z ( tH X CD X CD ro X 1 y— 00 1 CD CD CD CD CD o CD CD CD CD o i X W 1 t-4 t4 CM CM (M 1 UJ X <Y 1 in o CD CD CD a CD CD CD O a 1 O o UJ t CD «r4 CM in CD CD CD CD CD CD CD 1 «S >-4 V— 1 1 O UJ UJ 1 t-» in O tn CD ro in 1 X z 1 t-4 T^ CM CM CM 1

T-* 1

B-4
VO

' r

CM6

O

CO

o

CM H

I

O

LU

X

111 o

<

a

CMo 0

1 (%)$ ‘N0llVIA3a

B-5

6

=

100*(NBS

Vol.

-

Cal i

b.

Contractor

Vol.)/Tank

Vol

.

Dashed

lines

are

+0.2%

and

“0.2%

error

limits.
FOAM NBS-UI

(rev. ti-ts)

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

WASHINGTON, D.C. 20234

REPORT OF CALIBRATION

For: Tank #2 on Che LNG Tanker

El Paso Arzew

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 2 of the liquefied natural gas tanker El Paso Arzew while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull. Both the measurement method

and the computational algorithms are outlined in the paper "Multiple Redundancy in the Measurement of Large Structures," Annals of the International

Institution of Production Engineering Research (CIRP), Volume 27/1, 1978.

The tank was measured empty while at an average temperature of 23.5°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

The measurement method used includes geometrically redundant cross checks

which allow assessment of the random error in the measurement process. For

this tank, the total volume, excluding the vapor domes, was 24885.3 nr with

an uncertainty of 12.4 m^ (0.05% of total volume) at the three standard

deviation limit of random error. Including an analysis of probable systematics by adding the absolute magnitude of the error sources, we estimate

that the total uncertainty, at the 99% confidence level, is + 0.10% of the

total volume. No estimates of the errors in the individual table entries

are included, since without an estimate of the height error introduced by

the liquid level gage such estimates would of necessity be incomplete.

For the Director,

Russell D. Young, Chpef

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: August 16, 1979

B-6
EL PASO ARZEW

MAIN VOLUME VS. HEIGHT TA8LE

TANK NO. 2

GAGE HEIGHT VOLUME

(METERS) (CUBIC METERS)

0.000

.050

• 100

• 200

. 300

• 400

.500

1.000

2.000

3.000

4.000

5.000

6.000

7.000

3.000

9. 0Q0

10.000

11.000

12.000

13.000

14.000

15.000

16.000

17.000

18.000

19.000

20.000

21.000

22.000

22.500

23.000

23.500

24.000

24.500

25.000

25.500

6.3

45.3

86.1

168. 1

250.8

334.2

418.1

847.5

1754.1

2724.3

3753.1

4832.5

5907.5

6982.

6

8057.8

9132.9

10208.1

11283.3

12358.5

13433.8

14509. 1

15534.4

16659.8

17735.1

18799.6

19805.9

20748.6

21627.9

22443.6

22827.6

23195.7

23548.

0

23834.4

24204.9

24509.5

24798.

2

B-7
GAGE

CORRECTION

IN

MILLIMETERS 1 LA 1 N. LA O' ro •3" 03 CO 03 ro -3- 1 • 1 • • • • • • • • • • • 1 A 1 LA 0 cr» O' O' O' O' O' CD O CD 1 ¥ 1 CM A- a O' O' O' O' O' 0 0 0 A 1 1 1 1 H H H -r-4 CM CM CM

oo 1 4 1 • I 1 1 1 1 1 1 az 1 1 LU » 1 4- 1 • LU • O 1 A a 0 O AJ *o AJ A A A

2: » • 1 W • A 1 LA O'

a 4 T-

r4 -H

H r4 1 1 AJ A ro A- A- A- A- A A A A z 1 1 1 I r4 r4 *-4 QZ 1 1 1 1 1 1 1 • 1 • 1 LU 1 t t— 1 1 in t • 1 LA t O' N. AJ LA IA A- A A CD CD V 4 • 1 • • • • • • • • • • • CD 1 fSJ 1 A- -3- CM CM CM AJ AJ AJ ro ro 1 + 1 AJ A AJ J- Lf Jt J- .3 •3- -3- X 1 » 1 f -4 H M 1 1 1 1 1 1 1 1 1 1 1 az 1 » K 1 1 1 CD 1 J- CD CM AJ AJ ro ro AJ 1 • 1 • • • • • • • • # • • 1 CM 1 LA O' -3- -3- -3- .3- -3- J- t + 1 CM A O tH H t4 'r-4 r-4 H 1 1 1 1 H 'H r4 11 1• • 1 1 1 1 1 1 1 1 11 LA 1t J- A LA A A- A A A A A 1 • 1 • • • • • • • • • • • 1 H 1 a LA LA LA A A A A A A 1 + 1 AJ a 03 CO 00 CO CO 00 A A A 11 11 1 1 1 1 » 1 4 1 1 1 1 11 CD 11 cr> CD w H t-4 1 11 AJ A- A- N» N* A- A A A A 1 -4- 1 AJ LA LA LA A A A A A A A 11 11 1 1 1 1 4 1 1 1 1 1 1 11 O 11 CD CD O CD O a CD CD a O CD 11 O «1 H O O CD CD CD 0 CD CD CD O 1! 11 m 1 LA 1 O A LA A A A A A A A A

az • • 1 • • • • • • • • • • • LU • O 1 O' 03 03 CO 03 03 03 CO A A aO h~ 1 | 1 AJ AJ AJ AJ AJ AJ CM AJ AJ CM AJ LU 1 1 X 1 1 w 1 1 1 CD 1 LA CM t-4 H H a CD tH 3 1 • I 0 1 1 N- A- A. A- A- A A A A

CD 1 1 I LA LA LA LAA

A

A

A

A

A

A

>~ 1 1 CD » 1 • LA I 03 CO CO AA

A

A

A

A JX 1 • 1 • • • • • • • • • • •

»—

1 1 A LA IA LAAA

A

AA

A

A

a: 1 1 1 CO 03 03 CO ao CO 03

A

A

A

A

H- 1| 1 1 1 1 4- m 1 CD CD CD

OO CD CD CD CD CD

O 1 LU X QZ I LA CD CD CD O O CD CD CD a O 1 <J> tn !U 9 CD AJ LA CD CD 0 CD CD CD O 1 <r H 1 4 O LU LU 1 r4 A O A CD ro A 1 X X 1 CM OJ CM • >90 1 • O l A

A

A

AO -S' jA

A 1 • 1 • • • • • • •- • • • • *» 1 AJ 1 J- ro O' AJ A J’ -3- -3- J- Al

00 1 4. 1 a <0 -3-

H r4 4 4 4 LU 1 1 LU 1 • az 1 » 0 1 t UJ 1 A 1 CM CD -3- O A A A O' A CM a 1 • 1 • • • • • • • • • • • w 1 w4 1 A A A A A A A A H 4 1 1 4. 1 A A AJ | a 1 4 (X 1 4 «o 1 1 O i 1 CO t a 1 A CD CD A A CM AJ AJ AJ A A

IX 1 • 1 • • • • • • • • # • • < 4 H 1 A A A -3- AJ f\J AJ 1 4— 1 4» 4 AJ 00 1 1 0 11 I1 h- 1 A 1 AJ A A A A •H J- A A 1 • 4 4— I O 1 O' A *-4 t*4 H

00 I 1 4—4 t 4 _j 1 1 1 CO 1 CD CD

O CD CD CD

O CD CDO

O 1 • 4 11 CD <1 CD CD O CD 0 0 O O O CD •1 A 14 O' A A A A H A J- j- 1 • 1 4 O 4 A CM 4 4 4 H H 11 1 •1 4 1 4 1 • 1 11 CD •4 O CM ro AJ AJ AJ AJ A A. j*

a 1 • 1 • • • • • • • • • • • 00 1 4 CM ro CM 4 1 AJ AJ CM A A

IU 1 1 1 LJ- AJ 4 1 1 4 4 4 LU 1 1 a: 1 1 A 1 1 LU 1 A 4 A A A A A m ro CD O' CM

CD 1 • 4 I H 4 O'

A

AH

A ro

AA

A

A 1 < 4 A H 4 1 4 4 4 4 4— 1 1 az 1 1 0 t 1 CL * 4 1 CD 1 A A A A J" 3- J- A a fw 0 1 • I 4- 1 CM 1 A A H ro A J- AJ —4 A 1 1 1 O' A j- 4 4 1 4 4— 1 4 4 1 00 I 1 4-1 I 1 _J 1 m 4 » 4- az 4 CD CD CD CD CD <D CD CD O CD CD 1 LU X LU 4 A O O 0 O CD CD CD CD CD O * A A 4- 1 O H AJ A C3 CD O CD 0 CD O 1 d 1—1 LU 4 1 A LU X 4 T-J A CD A O A A 1 X 1 AJ Al AJ

B-8
El

Paso

Arzew

-

Tank

2

T

o

o

o

o

o

o

o

o

o

o

o

CM H

X

o

LLI

HI

O

2 O

! ° !

! o !

1 §>—oi 1 o

Tf CM O CM o o' o o i

i (%)S ‘N0I1VI A3Q

B-9

&

=1

00* (

NBS

Vol

.

-

Calib.

Contractor

Vol

.

)/Tank

Vol

.

Dashed

lines

are

+0.2%

and

“0.2%

error

limits.
FORM NBS—44J

(REV. !i-*S)

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

WASHINGTON, D.C. 20234

REPORT OF CALIBRATION

For: Tank #3 on the LNG Tanker

El Paso Arzew

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 3 of the liquefied natural gas tanker El Paso Arzew while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to

the six sets of draft marks on the ship's hull. Both the measurement method

and the computational algorithms are outlined in the paper ‘"Multiple Redundancy in the Measurement of Large Structures," Annals of the International

Institution of Production Engineering Research (CIRP) , Volume 27/1, 1978.

The tank was measured empty while at an average temperature of 23.5°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

The measurement method used includes geometrically redundant cross checks

which allow assessment of the random error in the measurement process. For

this tank, the total volume, excluding the vapor domes, was 27646.0 m^ with

an uncertainty of 13.8 m^ (0.05% of total volume) at the three standard

deviation limit of random error. Including an analysis of probable systematics by adding the absolute magnitude of the error sources, we estimate

that the total uncertainty, at the 99% confidence level, is + 0.10% of the

total volume. No estimates of the errors in the individual table entries

are included, since without an estimate of the height error introduced by

the liquid level gage such estimates would of necessity be incomplete.

For the Director,

Russell D. Young, Chief

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: August 16, 1979

B-l 0
EL PASO ARZEW

MAIN VOLUME VS. HEIGHT TABLE

TANK NO, 3

GAGE HEIGHT VOLUME

(METERS) (CUBIC METERS)

0.000

• 050

• 100

• 20 0

• 300

.400

.500

1.000

2.000

3.000

4.000

5.000

6 . 000

7.000

8.000

9.000

10.000

11.000

12. 000

13.000

14.000

15.000

16.000

17.000

19.000

19.000

20.000

21.000

22.000

22.500

23.000

23. 500

24.000

24. 500

25.000

25.500

13.1

59.3

106.1

200.

3

295.1

390.7

486.9

978.1

2011.6

3113.1

4282.6

5494.8

6707.

7

7920.7

9133.7

10346.

8

11559.9

12773.

1

13986.3

15199.6

16412.9

17626.3

18839.7

20040.3

21178.3

22248.7

23251.6

24186.8

25054.4

25462.9

25854.4

26229.1

26586.8

26927.7

27251.6

27558.7

B-n
GAGE

CORRECTION

IN

MILLIMETERS 1 in 1 ro in in in

O 0 O J- in 10 1 • 1 • • • • • • • • • • • 1 ro 1 ro N. n- (M (VI ro ro ro ro ro ro 1 + 1 ro N. J- 4-4 •r-4 4-4 4*4 4-4 4*4 r4 4-4 4-* 1 1 1 1 4-4 CM CM CM CM CM CM CM CM

GO 1 » 1 1 1 1 1 1 1 1 1 On 1 1 UJ 1 1 1 0 1 4*4 ro CM CM N. r^ ao ro -3- CM »- 1 1 I • 1 • • • • • • • • • • • UJ 1 o 1 cn CM ro ro in in M3 cn cn CD 1 CM 1 0 cn in ro ro ro ro ro in ro CM £ 1 « t • • • • • • • • • • • GO t + 1 44 CO in 4-4 4-4 • l 1 1 ro 1 CM M3 CD CM CM CM CM CM CM CM ro UJ 1 1 4-4 1 4- 1 ro r«- j- CO <D aO CD eo 03 CD (D UJ 1 1 Z 1 t y | 4-4 4—4 4*4 4H 4H 4-4 4-4 4-4 ^4 on 1 1 on 1 1 i 1 1 1 1 1 1 1 1 in 1 1 UJ 1 1 UJ I in 1 in in in CM ro <D ID CO ro CM in b- 1 1 0 1 • 1 • • • • • • • • • • • in 1 1 ** 1 4-4 1 CD ao 03 (D CO CM CM (VJ CM 4t4 1 1 in t in -3- cn cn CM CM CM Jr J- 1 4- 1 r>- in CM 1 1 >• 1 • J • • • • • • • • • • • 0 1 1 m 1 M 1 CM j- —4 4-4 CM CM CM CM (VJ CM (£ » 1 1 + 1 ro s- ro in in in Lf\ in in in in et 1 1 £ 1 1 1 i 4-4 4—4 4-4 4-4 4-4 r4 4-4 4-4 4-4 O « 1 H4 1 1 1 1 1 1 1 1 1 1 1 03 1 O 1 ao in O •3- cn cn cn in 0 ro an 1 1 QC • • 1 b- 1 t <r 1 1 N. cn CO 4 4 ^4 4 1 a 1 1 t- 1 1 J- CM 1 o CT> CO ro in in CO rw N- cn cn 03 to 1 1 1 nj 1 4-4 H M3 4*4 4-4 4-4 4-4 4-4 4-4 4-4 ^4 0 11 1 1 + 1 ro r- CM CM CM CM CM CM CM CM b- 1 m 1 in md r«- M3 r>* <

9 9 ro in in 1 1 » i 4"4 4-4 t4 4-4 4-4 4"4 4-4 4-H 4-4 1 « 1 1 1 1 1 1 1 1 1 1 1 t 1— 1 0 1 03 in 4-4 4-4 4-4 1 t GO I 1 4-4 1 1 h-4 1 1 1 in 1 4-4 CM CM CM CM ro ro ro ro -3- 3- -1 1 1 1 W 1 r4 r- 4 •4-4 4-4 4-4 4-4 4-4 -4 4—1 4-4 1 CD 9 0 0 0 O CD 0 a 0 O 0 O 1 4- 1 ro lO cn cn cn cn O' cn cn cn cn 1 • i 11 11 ' 1 1 1 • l 1 l 1 « l >1 O 11 0 a 0 0 a 0 0 O O 0 O 11 o »1 N- in cn aO <T> cn cn <n ao 03 11 in 1• cn r^ in in in cn CD cn in ro CM 1 • 1 • • • • • • • • • • • • • 1 • • • • • » • • 1 cn in CD O CD CD CD O CD O CD 1 0 1 j- CM 1 1 | 1 4-4 t 4-4 4-4 4-4 1 4" 1 CM in in md in in iC M3 in M3 in 1 i t 4-4 1 1 1 1 t1 11 i ( i i 1 i 1 1 1 • < •1 11 11 11 11 a 11 cn CM CD CM CO cn cn O J- CM 1 cd 1 cd a o O CD 0 CD a CD O O a 1 • 1 • • • • • • • • • • • 1 • • GO 1 • CM J- ro CD 4-4 4-4 4-4 ro ro 1 o 1 a cd CD CD CD CD O 0 O O CD tlJ 1 1 1 -3" CM 1 1 t 1 1 l 1 1 UJ 1 1 1 1 an 1 • 1 • <n 1 1 in 1 tn 1 in in in in j- .3- -± j- j- UJ 1 in « in H eo cn CD CO 03 lO 03 ry 1 • 1 • • • • • • • • • m • 0 1 • 1 • • • • • • • • • • • UJ 1 a 1 CD ra o CD a CD O 0 CD CD CD w 1 4 1 CM CM 4-1 4-4 4-4 CM CM CM r- in in 1 i 1 ro ro ro ro ro ro ro ro ro ro ro 1 1 1 s- in CM 1 1 1 1 1 1 UJ 1 1 b- I • £ 1 1 on 1 » W 1 1 0 1 1 1 o 1 LD cn cn cn CD CT> <n cn QO CO 03 Q_ » 1 £ 1 • 1 • • • • • • • • • • • 1 0 1 CO r^ O in 03 N- N- (O ro j- CM O 1 4-4 1 CD O o O 0 CD O O CD O 1 • » cn 1 i 1 M3 M3 in vO >n iC iO in in in in t— 1 CM 1 CM 4-4 r^ J- ro ro ro CM 0 cn • 1 1 1 1 a 03 -3- | 1 » 4-4 4-4 1 V » ) H 1 1 4-4 1 1 cn 1 1 GO 1 1 1 in 1 in j- -3- 4- ro ro ro 4-4 O 4 (-> 1 1 £ 1 • 1 ~J 1 GO 1 *—

1 H 1 4-4 H ^4 r4 4-4 t-4 4-4 v4 4-4 H 4-4 « b- on t 0 CD a CD CD CD CD O CD CD CD

or 1 i 1 cn cn <n cn cn <T> cn cn cn cn cn « UJ

X UJ 1 in

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O CD

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1 1 0 IU £ < 4"4 in CD in

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B-l 2
B-l 3

&

=

100*(NBS

Vol

.

-

Calib.

Contractor

Vol

.

)/Tank

Vol.

Dashed

lines

are

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~0.2%

error

limits.
FORM NBS-253

( 3-««)

U.S. Department of Commerce

NATIONAL. BUREAU OF STANDARDS

WASHINGTON. D.C. 20234

REPORT OF TEST

For: Tank # 4 on the LNG Tanker

El Paso Arzew

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 4 of the liquefied natural gas tanker El Paso Arzew while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull.

The tank was measured empty while at an average temperature of 27.3°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

These tables are not based on a complete survey of the tank, since

scaffolding necessary for complete interior access was not present at the

time of measurement. As a consequence, geometrically redundant cross checks

reported of tanks 1, 2, 3, 5, and 6 were not made on this tank to assess random measurement errors. The estimated uncertainty of the tables is

instead based on the comparison of measurements on tanks 1, 2, 3, 5, and 6

against their respective nominal construction dimensions. These comparisons

showed measured dimensions were in general within 0.2% of the nominals so an estimated uncertainty of + 0.2% of total volume is assigned to the tables.

For the Director,

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: August 16, 1979

B-l 4
EL PASO ARZEW

MAIN VOLUME VS. HEIGHT

TANK NO. 4

TABLE

GAGE HEIGHT

(METERS)

VOLUME

(CUBIC METERS)

0.000 • 1

.050 11.4

.10 0 23.7

.200 43.2

• 300 72.8

• 400 97.3

.500 121.9

8-1 5
GAGE

CORRECTION

IN

MILLIMETERS 1 in 1 C\J in CP O' 1 * • • • • • 1 fO 1 in cp N- p» 1 • *4 4- UJ i0

«•» 1 1 i l 1 1 (S) 1 1 O' 1 1 UJ 1 1 i o f U3

a CD <33 H- 1 1 i • 1 • • • • UJ 1 o 1 N. N- (VI (VI i (VI 1 V0 in f\J in £ 1 • 1 • • • • (Si i + 1 CO UJ PO w t ro 1 4- UJ <33 ao UJ i 1 1 + • 4 4" in in UJ i 1 £ 1 • i 1 i i Of i 1 O' 1 1 o i 1 UJ 1 1 UJ t in 1 *4 4- in J- - 1 1 i • 1 • • • •

IS) 1 1 i fH 1 ro (VI j- J- 1 in 1 t4 in in in i + I i0 4-

>- I • 1 • • • • o i 1 cd 1 (VI 1 J- (VI CO ao O' i 1 1 1 W 4- 4- i 1 £ 1 1 1 i i 1 o • 1 r-t 1 1 CD l CD 1 O' O' O' O' O' 1 1 ar 1 • f • • • • t— 1 1 <c t H 1 O' o fO (VI 1 1 *— » + 1 ro (VI 1 o f (VI CP <53 P- (Si • I 1 • 1 • • • • i 1 1 CVI 1 ro 4- aO <33 o i 1 1 + 1 *"4 ro ro ro H- i in « o O' ** 4- 1 1 < 1 1 i i • 1 • • * • 1 1 f— i o 1 P- ro 1 1 IS) i 4* 1 4 1 « 1—

i 1 1 in 1 O' a o o 1 1 1 • 1 • • • • i 1 1 tH 1 4 CP CP CP t O I 4 CD 1 + 1 t4 CVI (VI (VI i • 1 • • • • 11I t1a 1 1 ‘ 1 •ii o 11• l 1 O V11 o 1•• in ro ro in ii in 111 V0 p» v£ in 1 • l • • • • i • 1 • • • • 1 l in CP CP CP i o 1 V0 *4 t4 ^4 1 • i *4 t4 i l 1 •4 | 1 •1 i1 1 1 i ii 1t 11 li ii a 1»

-»“4 (VI cn

O 1 o 1 4- ^-4 4 o «•» i • 1 • • • • 1 • 1 • • • lSi i ^4 1 ao <33 ro 1 o l 1 1 o UJ i l 1 ro *4 1 1 1 l UJ i 1 1 i O' i 1 1 l LS ( 1 (S) 1 in i CD U) p- UJ UJ i in 1 r^ ro in or I • i • • • • a i • 1 • • • • UJ 1 o t o CP CP CP «» i 1 O' <33 CO 4" i- 1 1 i 4 i 1 • in ro 1 UJ 1 • u i 1 £ 1 i QC » 1 «» 1 1 O i 1 1 o l K 4- ro 4 0. « 1 £ 1 « 1 • • • • i O 1 p* 4 in o O • ^4 l CP CP <P <p o i • 1 • • • • CD 1 1 1 *-4 t4 r— i (VI 1 *-4 CP UJ » 1 i 1 I <33 in (\j 1 >- 1 1 b- » 1 CD • l on i 1 1 in » J- a T-t v4 »-» 1 1 £ 1 • 1 • • • • _i 1 to 1 t-t 1 i CP CP CP O' » t- Q£ 1 CD <CJ CD o

QC 1 1 1 (VI (VI (VI CVI i UJ £ UJ I m

a CD o

*— 1 1 i UJ UJ 1— 1 CD r4 rvj in 1 1 1 < l-H UJ 1 • • • • 1 —* i i UJ Id £ 1 1 *— on 1 o o o CD i £ • 1 UJ £ or i in a o o 1 <U> UJ u 1 o t4 (VI in 1 <x >-4 »— l • • • » 1 o UJ UJ i 1 £ £ • 1 -*« 1

B-16
00

CO I

O

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HI

o

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(

D

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1

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<5

=

100*(NBS

Vol

.

-

Calib.

Contractor

Vol.)/Tank

Vol

.

Dashed

lines

are

+0.2%

and

~0.2%

error

limits.
FOAM NBS-U1

(REV. li-fcS)

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANDARDS

WASHINGTON, O.C. 20234

REPORT OF CALIBRATION

For: Tank #5 on Che LNG Tanker

El Paso Arzew

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 5 of the liquefied natural gas tanker El Paso Arzew while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull. Both the measurement method

and the computational algorithms are outlined in the paper "Multiple Redundancy in the Measurement of Large Structures," Annals of the International

Institution of Production Engineering Research (CIRP) , Volume 27/1, 1978.

The tank was measured empty while at an average temperature of 27.1°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

The measurement method used includes geometrically redundant cross checks

which allow assessment of the random error in the measurement process. For

this tank, the total volume, excluding the vapor domes, was 27622.9 m

J with

an uncertainty of 13.8 m^ (0.05% of total volume) at the three standard

deviation limit of random error. Including an analysis of probable systematics by adding the absolute magnitude of the error sources, we estimate

that the total uncertainty, at the 99% confidence level, is + 0.10% of the

total volume. No estimates of the errors in the individual table entries

are included, since without an estimate of the height error introduced by

the liquid level gage such estimates would of necessity be incomplete.

For the Director

Russell D. Young, Chief

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: August 16, 1979

B-l 8
EL PASO ARZEW

MAIN VOLUME VS. HEIGHT TABLE

TANK NO. 5

GAGE HEIGHT

(METERS)

VOLUME

(CUBIC METERS)

Q.000 14.4

. 050 59.7

• 10G 106.5

• 200 200.8

. 300 295.7

.400 391. 3

.500 487.5

1.000 979. C

2.000 2012.8

3.000 3114.2

4.000 4283.3

5.000 5495.1

6.000 6707.6

7.000 7920.2

8. 000 9132.7

9.000 10345.2

la.ooo 11557.8

11.000 12770.3

12.000 13982.9

13.000 15195.5

14.000 16408.1

15.000 17620 .

7

16.000 18833.4

17.000 2 G 0 3 3. 0 18. QCQ 21170.

0

19.000 22239.2

20.000 23240 .9

21.000 24174.

9

22.000 25041.3

22.500 25449.

1

23.000 25840.0

23.500 26214.

0

24.000 26571.1

24.500 26911.3

25.000 27234.5

25.500 27540.9

B-l 9
EL

PASO

ARZEW

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NO

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cn

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to i * 1 t I 1 1 • 1 I 1 X » 1 UJ i • I a 1 ao

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>- i • J— • 3 H i 1 3 m i 1 00 1 1 i LA 1 A- «y J- j- J- AJ to AJ •*4 CD l-t t 1 X i • • -1 » to 1 V-4 i 1 44 44 H 44 44 44 r4 44 4 r4 » J- X 1 CD CD CD o CD CD CD CD a CD

or i i 1 cn cn cn cn cn cn cn cn cn cn O' 1 UJ

X UJ 3 LA CD CD CD CD

a o o a CD o

t— • 1 1 UJ UJ >— 3 CD r4 AJ LAa CD CD

a CD CD CD i 1 » <* UJ 1 i A 1 1 u> UJ X 3 H LA O LA CD to LA i h- 00 1 CD CD O CD CD CD o CD O CD CD 1 X 1 r4 4-4 AJ AJ AJ • UJ X X 1 LA CD CD o O O CD CD CD a CD • uj uj UJ • CD AJ la CD CD CD CD CD CD CD i <r »—4 H— 1 i uj LU LU 1 4 LA CD LA CD to LA i X X 1 •r-4 4 AJ AJ AJ • 1

B- 20
El

Paso

Arzew

-

Tank

5

o

o

o

o

o

o

o

o

o

o

o

CO

o

CM E

h-

(%)8 ‘N0I1VIA3Q

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0

1

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B-21

=

100*(NBS

Vol

.

-

Calib.

Contractor

Vol.)/Tank

Vol.

Dashed

lines

are

+0.2%

and

“0.2%

error

limits.
FORM NRS-UJ

(REV. 1»-M)

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANDARDS

WASHINGTON, D.C. 20234

REPORT OF CALIBRATION

For: Tank. #6 on the LNG Tanker

El Paso Arzew

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 6 of the liquefied natural gas tanker El Paso Arzew while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull. Both the measurement method

and the computational algorithms are outlined in the paper "Multiple Redundancy in the Measurement of Large Structures," Annals of the International

Institution of Production Engineering Research (CIRP) , Volume 27/1, 1978.

The tank was measured empty while at an average temperature of 29.0°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

The measurement method used includes geometrically redundant cross checks

which allow assessment of the random error in the measurement process. For

this tank, the total volume, excluding the vapor domes, was 27639.1 m

J with

an uncertainty of 13.8 m^ (0.05% of total volume) at the three standard

deviation limit of random error. Including an analysis of probable systematics by adding the absolute magnitude of the error sources, we estimate

that the total uncertainty, at the 99% confidence level, is + 0.10% of the

total volume. No estimates of the errors in the individual table entries

are included, since without an estimate of the height error introduced by

the liquid level gage such estimates would of necessity be incomplete.

For the Director,

Russell D. Young, Chief

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

77

Date: August 16, 1979

B - 22
EL PASO ARZEW

MAIN VOLUME VS. HEIGHT TABLE

TANK NO. 6

GAGE HEIGHT

(METERS)

0.000

.050

.100

.200

. 300

• 40 0

.500

1.000

2.000

3.000

4.000

5.000

6.000

7.000

3. 000

9.000

10.000

11.000

12.000

13.000

14.000

15.000

16.000

17.000

18.000

19.000

20.000

21.000

22.000

22.500

23.000

23.500

24.000

24.500

25.000

25.500

VOLUME

(CUBIC METERS)

0.0

12.6

55.6

149.4

243.9

339.1

435.0

924.6

1954.4

3052.0

4217.4

5423.6

6641.1

7853.7

9066.3

10279.0

11491.8

12704.6

13917.5

15130.5

16343.5

17556.6

18769.7

19972.2

21113.4

22187.1

23193.2

24131.7

25CC2.6

25412.

7

258C5.9

26182.2

26541.6

26884.1

27209.6

27518.3

B - 23
GAGE

CORRECTION

IN

MILLIMETERS 1 LO 1 in

H US CD CM CP CP as in US as t • 1 • • • 9- • •• • • • • • 1 po • O' US CM »< CM CM OJ CM PO PO PO 1 + 1 H CM a -H H tH T-l H •H 4 i-4 « 1 1 rH CM CM CM CM CM CM CM CM

go 1 1 • 1 1 » gg 1 g

g 1 1 UJ 1 1 g 0 g -S' p- PS PO O' PO PO -S’

a 4 2

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B-24
o

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Vol

.

Dashed

lines

are

+0.2%

and

~0.2%

error

limits.
'

.
Appendix C

Calibration Reports for the Six Tanks of the El Paso Howard Boyd

C-l
FORM NOS-UJ

(REV. lJ-M)

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

WASHINGTON, D.C. 20234

REPORT OF CALIBRATION

For: Tank #1 on the LNG Tanker

El Paso Howard Boyd

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 1 of the liquefied natural gas tanker El Paso Howard Boyd while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull. Both the measurement method

and the computational algorithms are outlined in the paper "Multiple Redundancy in the Measurement of Large Structures," Annals of the International

Institution of Production Engineering Research (CIRP), Volume 27/1, 1978.

The tank was measured empty while at an average temperature of 22.6°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

The measurement method used includes geometrically redundant cross checks

which allow assessment of the random error in the measurement process. For

this tank, the total volume, excluding the vapor domes, was 12554.3 nr with

an uncertainty of 6.3 m^ (0.05% of total volume) at the three standard

deviation limit of random error. Including an analysis of probable systematics by adding the absolute magnitude of the error sources, we estimate

that the total uncertainty, at the 99% confidence level, is + 0.10% of the

total volume. No estimates of the errors in the individual table entries

are included, since without an estimate of the height error introduced by

the liquid level gage such estimates would of necessity be incomplete.

For the Director,

Russell D. Young, Chief

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: September 14 1979

C-2
EL PASO HOWARD BOYO

MAIN VOLUME VS* HEIGHT TABLE

TANK NO. 1

GAGE HEIGHT VOLUME

(METERS) (CUBIC METERS)

0.000

.050

• 100

• 20 0 .30 0 .400

.500

1 . 000

2.Q0C

3.000

4.000

5.000

6.000

7.000

3.000

9.000

13.000

11.000

12.000

13.000

14.000

15.000

16.000

17.000

13.000

19.000

20 .000

21.000

22.000

22.500

23.000

23.500

24.000

24.500

25.000

25.500

.5

15.6

31.4

63.4

95.9

123 . 3

152.3

336.5

720.3

1151.4

1629.7

2133.6

2648.

1

3157.6

3667.1

4176.5

4686.0

5195.4

5704.8

6214.2

6723.6

7233.

0

7742.4

8251.8

3761.1

9270.4

9779.7

10289.1

10798.

3

11 05 3.0

11307.6

11562.3

11811.9

12049.8

12275.

8

12490 .

0

C-3
1 in 1 CO o% in in 6 9 O'

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to 1 1 i i i i i i i • i O' 1 1 UJ 1 1 1 a 1 3 7 ao 9 l r- 9 8 CO 8 9

t— 1 1 1 • 1 UJ 1 CD 1 O' y r4 p- 9 6 o T-4 O t4 CO 1 CM 1 O' CD ao in in *3- 2 1 • 1 to 1 1 y CO i W 1 CO 1 CP r4 CO in in in 03 03 03 M3 03 UJ 1 1 1 + 1 4 M3 CM CM CM CM CM CM CM CM UJ 1 1 2 1 1 1 1 ^4 r4 r4 t4 r4 t4 H r4 H ct 1 1 ct 1 1 i i i i i 1 i i i CD 1 1 UJ 1 ( UJ 1 in • CO in 03 y y in S- 03 03 03 03 h— 1 1 a I • 1 • • • • • • « • • • • 00 1 1 1 w 1 y co CO CO CM 1 in 1 J- CO CO s. 03 O' CD T-4 o tH CM 1 • CO t-4 I >• 1 • 1 • • • • • • • • • • • Q 1 1 m 1 M t O' O' r4 J- Mf J- in in in in in a: 1 1 1 + • in O a CD CD CD CD CD CD CD <r 1 1 X 1 I 1 l r4 t-4 r4 H 4 t4 t-4 t-4 r4 o 1 1 »—4 1 1 i i i • i • i i < m t CD 1 03 CM 03 ® c- CO in y y y o

O' 1 1 a? 1 • 1 *— 1 1 <t 1 T*4 1 CD v0

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a 1 • 1 • • • • • • • • • • • UJ 1 a 1 CD H 4 H •H a t-4 t-4 r4 CD CD t t-4 1 CO in t-4 t-4 t4 i i 1 1 | ro 1— » l • CM CM OJ CM CM CM CM CM CM CM CM 1 i 1 ro t-4 • UJ 1 1 1 1 X 1 1 c^ 1 1 w 1 1 o 1 1 1 a 1 o H 4 CM 4 T“4 CD O' C3 O' O' a. 1 1 2 1 • » 1 o 1 y 03 y CM y O' n- <o CO ao 03 o 1 tH • CM CM CM CM CM CM CM *“4 CM t-4 ^4 o i • 1 • • • • • • 0 • 0 • • m « i 1 y y y J- J- y y y y y y P- 1 CM 1 s. «3 03 CO ro i i 1 1 | 03 • 1 1 1 1 y CM 1 V 1 ( W 1 » CD 1 1 to 1 1 1 m 1 CO CM CM CD T-4 CD a O' t-4 O' l-t • A 1 X 1 • » • • • • « • • • • • • _) 1 to • h-4 1 r4 • ro co CO CO PO PO CO CO (M CO CM 1 1- Ct 1 CD CD CD o CD CD O CD o CD o

ct I i 03 M3 03 M3 03 03 M3 03 03 M3 M3 1 UJ

X UJ I in CD CD o CD CD

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a CD CD o — 1 I 1 o CD 1— 1 O r4 CM in CD O CD o o CD rD 1 1 1 <y t-t UJ 1 » » 1 o UJ X 1 t-4 m CD in CD ro in • t— 00 ( CD CD CD CD CD CD CD CD CD o CD 1 X W » t-4 t-4 CM CM » UJ X ct » in CD CD O CD CD CD CD CD CD CD • o (J5 UJ t CD CM in CD CD CD CD O CD CD 1 <3 H l— 1 1 cd UJ UJ t t-4 in CD in a CO in 1 X X 1 t-4 t-4 CM CM CM

C-4
e

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=

100*(NBS

Vol.

-

Calib.

Contractor

Vol.)/Tank

Vol.

Dashed

lines

are

+0.2%

and

"0.2%

error

limits.
FORM NBS-4U

(REV. 1J-4S)

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

WASHINGTON, D.C. 20234

REPORT OF CALIBRATION

For: Tank 1H on the LNG Tanker

El Paso Howard Boyd

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 2 of the liquefied natural gas tanker El Paso Howard Boyd while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull. Both the measurement method

and the computational algorithms are outlined in the paper "Multiple Redundancy in the Measurement of Large Structures," Annals of the International

Institution of Production Engineering Research (CIRP) , -Volume 27/1, 1978.

The tank was measured empty while at an average temperature of I5.2°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

The measurement method used includes geometrically redundant cross checks

which allow assessment of the random error in the measurement process. For

this tank, the total volume, excluding the vapor domes, was 24844.4 nr with

an uncertainty of 12.4 m^ (0.05% of total volume) at the three standard

deviation limit of random error. Including an analysis of probable systematics by adding the absolute magnitude of the error sources, we estimate

that the total uncertainty, at the 99% confidence level, is + 0.10% of the

total volume. No estimates of the errors in the individual table entries

are included, since without an estimate of the height error introduced by

the liquid level gage such estimates would of necessity be incomplete.

For the Director,

Russell D. Young, chief

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: September 14, 1979
EL PASO HOWARD BOYO

MAIN VOLUME VS. HEIGHT TABLE

TANK NO. 2

GAGE HEIGHT VOLUME

(METERS) (CUBIC METERS)

0.000

.050

. 100

• 200

. 30 0

• 40 a .500

1.000

2.000

3. COO

4.000

5.000

6.000

7.000

8.000

9.000

10.000

11.000

12.000

13.000

14.000

15.000

16.000

17.000

13.000

19.000

20.000

21.000

22.000

22.500

23.000

23.503

24.000

24.500

25.000

25.500

5.7

45.6

86.4

168.3

250.9

334.1

417. 9

846.7

1751.9

272C.5

3752.7

4825.8

5899.7

6973.6

8047.4

9121.3

10195.1

11269.0

12342.

9

13416.7

14493.

6

15564.5

16633.3

17712.2

18774.9

19779.5

2072C.5

21593.0

22412.1

22795.

3

23162.6

23514.

0

23849.6

24169.3

24473.1

24761.

C-7
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f>

=

100*(NBS

Vol

.

-

Calib.

Contractor

Vol

.

)/Tank

Vol

.

Dashed

lines

are

+0.2%

and

~0.2%

error

limits.
FORM NBS-tU

(REV. I1-4S)

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANDARDS

WASHINGTON, O.C. 20234

REPORT OF CALIBRATION

For: Tank #3 on the LNG Tanker

El Paso Howard Boyd

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 3 of the liquefied natural gas tanker El Paso Howard Boyd while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull. Both the measurement method

and the computational algorithms are outlined in the paper "Multiple Redundancy in the Measurement of Large Structures," Annals of the International

Institution of Production Engineering Research (CIRP) , Volume 27/1, 1978.

The tank was measured empty while at an average temperature of 15.0°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

The measurement method used includes geometrically redundant cross checks

which allow assessment of the random error in the measurement process. For

this tank, the total volume, excluding the vapor domes, was 27615.6 nr with

an uncertainty of 13.8 m^ (0.05% of total volume) at the three standard

deviation limit of random error. Including an analysis of probable systematics by adding the absolute magnitude of the error sources, we estimate

that the total uncertainty, at the 99% confidence level, is + 0.10% of the

total volume. No estimates of the errors in the individual table entries

are included, since without an estimate of the height error introduced by

the liquid level gage such estimates would of necessity be incomplete.

For the Director,

Russell D. Young, y

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: September 14, 1979

C-10
EL PASO HOWARD BOYO

MAIN VOLUME VS, HEIGHT TABLE

TANK NO. 3

GAGE HEIGHT VOLUME

(METERS) (CUBIC METERS)

O.QGO

.050

.100

• 200

.300

• LC0

.500

1.000

2.000

3. 000

4.000

5.000

6.000

7.000

8.000

9.000

10.000

11.000

12.000

13.000

14.000

15.000

16.000

17.000

18.000

19.000

20 .000

21.000

22.000

22.500

23. 000

23. 500

24.000

24.500

25.000

25.500

• 1

40.2

87.0

181. 0

275.8

371.2

467.3

957.9

1989.7

3089.

2

4256.

5467. 6

6680.1

7892.5

9104.9

10 31 7.3

11529.

7

12742.1

13954.5

15166. 9

16379.

3

17591.7

18804. 1

20004.

3

21142.3

22212.6

23215.3

24150.3

25017.7

25426.

0

25817.4

26191.9

26549.5

26890.2

27213.9

27520.8

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FORM NBS-UJ

(REV. 12-43)

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANDARDS

WASHINGTON, D.C. 20214

REPORT OF CALIBRATION

For: Tank. #4 on the LNG Tanker

El Paso Howard Boyd

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 4 of the liquefied natural gas tanker El Paso Howard Boyd while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull. Both the measurement method

and the computational algorithms are outlined in the paper "Multiple Redundancy in the Measurement of Large Structures,” Annals of the International

Institution of Production Engineering Research (CIRP), Volume 27/1, 1978.

The tank was measured empty while at an average temperature of 25.8°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

The measurement method used includes geometrically redundant cross checks

which allow assessment of the random error in the measurement process. For

this tank, the total volume, excluding the vapor domes, was 6249.3 nr with

an uncertainty of 3.1 m^ (0.05% of total volume) at the three standard

deviation limit of random error. Including an analysis of probable systematics by adding the absolute magnitude of the error sources, we estimate

that the total uncertainty, at the 99% confidence level, is + 0.10% of the

total volume. No estimates of the errors in the individual table entries

are included, since without an estimate of the height error introduced by

the liquid level gage such estimates would of necessity be incomplete.

For the Director

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: September 14, 1979

C-l 4
EL PASO HOWARD BOYO

MAIN VOLUME VS. HEIGHT TABLE

TANK NO. 4

GAGE HEIGHT VOLUME

(METERS) (CUBIC METERS)

0.000

.050

• 100

• 200

.300

.400

.500

1.000

2.000

3.000

4.000

5.000

6.000

7.000

3.000

9.000

10.000

11.000

12.000

13. 000

14.000

15.000

16.000

17.000

13.000

19.000

20.000

21.000

22 . 000

22.500

23.000

23.503

24.000

24.500

25.000

25.500

• 1

10.2

22.5

47 . 0

71.6

96.2

120.7

243.5

489.2

734.8

980.4

1226.0

1471.6

1717.2

1962.

7

2203.3

2453.9

2699.4

2945.0

3190.5

3436.1

3681.6

3927.2

4172.

7

4413.2

4663.7

4909.2

5154.7

5400.2

5522.9

5645.7

5763.4

5888.8

600 3.

6

6112.7

6216.

0

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1 Lf\ 1 N- ^i 03 cn 03 CO CO CO cn S3 CD 1 • 1 • • • • • • • • • • » 1 1 ro 1 O UJ r— N. n- N. N- n- N» S3 t +• 1 ti J" UJ UJ vO U3 U3 UJ vO UJ vO 1 1 t 1 1 1 1 1 | 1 i 1 1 00 1 4 (X 1 1 UJ 1 1 1 O 1 S3 o S3 5 6 n- n- UJ O' T-i 4- 1 1 • • 1 • • • • • • • • • • • UJ • CD 1 CVJ in vi CVJ vi T-i CVJ ^i -3- 1 CVJ 1 CD in in in in in in in in 1 z 1 • 1 CO 1 + 1 O' r- ro w 1 ro 1 o ro CO CO CO S3 <33 CO S3 S3 S3 UJ 1 1 1 1 T-i ur in in in in in in in in in UJ 1 1 z » 1 i i i t i i i i i • 1 1 1 or 1 I o 1 1 UJ 1 1 UJ 1 in 4 CVJ CVJ vO tU cvj cvj ro CVJ J ro o 1 — • 1 o 1 • 1 • • • • • • • • • • • co 1 1 1 tH 1 S3 s- N- -3- J* ur -3- Jr j T-i 1 in 4 O j- -3- j- -3- j- .3- in j- in 1 4- 1 U3 J- >- 1 • • • • • • • • • • • • • o 1 • 03 1 C\J 4 O' CD CO S3 S3 CO <33 CO S3 S3 03 (Z 1 I 1 4» 1 4 j- J- -3- J- J- J- j- J J

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FORM NBS-tU

(REV. 11-43)

U.S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS

WASHINGTON, O.C. 20234

REPORT OF CALIBRATION

For: Tank #5 on the LNG Tanker

El Paso Howard Boyd

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 5 of the liquefied natural gas tanker El Paso Howard Boyd while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank's capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship's hull. Both the measurement method

and the computational algorithms are outlined in the paper "Multiple Redundancy in the Measurement of Large Structures," Annals of the International

Institution of Production Engineering Research (CIRP), Volume 27/1, 1978.

The tank was measured empty while at an average temperature of 22.2°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

The measurement method used includes geometrically redundant cross checks

which allow assessment of the random error in the measurement process. For

this tank, the total volume, excluding the vapor domes, was 27637.4 nr with

an uncertainty of 13.8 m^ (0.05% of total volume) at the three standard

deviation limit of random error. Including an analysis of probable systematics by adding the absolute magnitude of the error sources, we estimate

that the total uncertainty, at the 99% confidence level, is + 0.10% of the

total volume. No estimates of the errors in the individual table entries

are included, since without an estimate of the height error introduced by

the liquid level gage such estimates would of necessity be incomplete.

For the Director,

Russell D. Young, Chl-^f

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: September 14, 1979

C-l 8
EL PASO HOWARD BOYD

MAIN VOLUME VS. HEIGHT TABLE

TANK NO. 5

GAGE HEIGHT VOLUME

(METERS) (CUBIC METERS)

0.000

.050

. 100

• 20 0

• 300

. 400

.500

1.000

2*000

3. COO

4.000

5.000

6.000

7.000

8.000

9. 000

10.000

11.000

12. 0 C 0 13. GOO

14.000

15.000

16. 000

17.000

18.000

19.000

20.000

21.000

22.000

22.500

23.000

23.500

24.000

24.500

25.000

25.500

4.0

48.3

95.1

189. 2

284. 0 379.5

4 75 .6

966.4

1998.8

3093.

9

4256.8

5478.

6

6691.3

7904.0

9116.

7

10 329.4

11542.1

12754.8

13967.5

15180.2

15392.9

17605.6

18813.3

20018.8

21157.1

22227.

8

23230.8

24166. 3

25034. 2

25442.8

25834.4

26209.2

26567.1

26908.

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27232.2

27539.4

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FORM NBS-Ut

(REV. I1-4S)

U.S. DEPARTMENT OF COMMERCE

NATIONAL. BUREAU OF STANDARDS

WASHINGTON, D.C. 20234

REPORT OF CALIBRATION

For: Tank #6 on the LNG Tanker

El Paso Howard Boyd

Requested by: El Paso Marine Company

2919 Allen Parkway

P. 0. Box 1592

Houston, TX 77001

The following tables have been calculated from dimensional measurements on tank number 6 of the liquefied natural gas tanker El Paso Howard Boyd while

berthed at Newport News Shipbuilding and Drydock Company, Newport News, VA.

These tables represent the volume of a liquid enclosed in the tank as a function of the height of the liquid surface, measured along a straight

line, fixed with respect to the tank. This line is defined as being located

at the longitudinal center line of the tank’s capacitance gage. Secondary

tables are also presented which allow correction of the main tables for

specific angles of ship orientation with respect to gravity, as referred to the six sets of draft marks on the ship’s hull. Both the measurement method

and the computational algorithms are outlined in the paper "Multiple Redundancy in the Measurement of Large Structures," Annals of the International

Institution of Production Engineering Research (CIRP), Volume 27/1, 1978.

The tank was measured empty while at an average temperature of 20.6°C. The

tabulated volumes and the error estimates apply to the tank under these

conditions. The volumes have also been corrected for the volume occupied by

the corregations (deadwood) which was measured in the laboratory using a hydrostatic displacement technique.

The measurement method used includes geometrically redundant cross checks

which allow assessment of the random error in the measurement process,. For

this tank, the total volume, excluding the vapor domes, was 27631.2 m with

an uncertainty of 13.8 m^ (0.05% of total volume) at the three standard

deviation limit of random error. Including an analysis of probable systematics by adding the absolute magnitude of the error sources, we estimate

that the total uncertainty, at the 99% confidence level, is + 0.10% of the

total volume. No estimates of the errors in the individual table entries

are included, since without an estimate of the height error introduced by

the liquid level gage such estimates would of necessity be incomplete.

For the Director,

Mechanical Processes Division

Center for Mechanical Engineering

and Process Technology

Date: September 14, 1979

C- 22
EL PASO HOWARD BOYD

MAIN VOLUME VS. HEIGHT TABLE

TANK NO. 6

GAGE HEIGHT VOLUME

(METERS) (CUBIC METERS)

o.ooo

.050

.100

.200

• 300

.400

.500

1.000

2.000

3.000

4.000

5.000

6.3C0

7.000

3.QG0

9.000

10.000

11.000

12. 000

13.000

14. 000

15.000

16.000

17. COG

IS. COO

19.000

20.000

21.000

22.000

22.500

23.000

23.500

24.000

24.500

25.000

25.500

0.0

25.6

72.3

166.3

260.9

356.2

452.2

942.3

1973.3

3071.

9

4238.2

5449.5

6661.9

7874.4

9086.8

10299.3

11511.9

12724.4

13937.

0

15149.6

16362.2

17574.9

18787.6

19988.8

21128.5

22200.5

23205.0

24142.0

25011.3

25420.

7

25813.1

26138.6

26547.3

26889.0

27213.9

27521.8

C- 23
GAGE

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IN

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C-24
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NBS-114A (REV. 9-78)

U.S. DEPT. OF COMM.

BIBLIOGRAPHIC DATA

SHEET

1. PUBLICATION OR REPORT NO. NBSIR 80-2141

4. TITLE AND SUBTITLE 5. Publication Date Estimated Accuracy of Calibration of Some Membrane

Type LNG Transport Tanks. S. Performing, Organization Code

MPS**s& .iL

7. AUTHOR(S) w> Haight> R# j. Hocken, B. Borchardt, C._ L.

Carroll, R. G. Hartsock, C. P. Reeve, F. Scire, R. Veale

8. Performing Organ. Report No.

9. PERFORMING ORGANIZATION NAME AND ADDRESS

NATIONAL BUREAU OF STANDARDS

DEPARTMENT OF COMMERCE

WASHINGTON, DC 20234

it No.

11. Contract/Grant No.

12. SPONSORING ORGANIZATION NAME AND COMPLETE ADDRESS (Street, City, state,, ZIP) 13. Type of Report & Period Covered

14. sponsoring Agency code

' ^

' -

: ( ; - . ( "

IS. SUPPLEMENTARY NOTES

I | Document describes a computer program; SF-185, FIPS Software Summary, is attached.

16. ABSTRACT (A 200-word or less factual summary of most significant information . If document includes a significant bibliography or

literature survey, mention it here,) The .National Bureau of Standards has completed a study on the calibration un- certainty of ship cargo tanks used to transport Liquid Natural Gas (LNG) . The data

from measurements made on 18 such tanks is presented, along with a comparison to

measurement determined from an independent technique. Calibration reports for each

tank measured by NBS are presented, including tables that relate tank volume to

liquid level in the tank. The measurement technique used was accurate to +0.05% of

total volume and agreed with the independent measurement data to +0.2%.

17. KEY WORDS (six to twelve entries; alphabetical order; capitalize only the first letter of the first key word unless a proper name;

separated by semicolons)

Laser; LNG; tanks; ships; volume; dimensions.

18. AVAILABILITY £ Unlimited

| | For Official Distribution. Do Not Release to NTIS

| j Order From Sup. of Doc., U.S. Government Printing Office, Washington, DC

20402, SD Stock No. SN003-003-

| j Order From National Technical Information Service (NTIS), Springfield, VA. 22161

19. SECURITY CLASS

(THIS REPORT)

UNCLASSIFIED

20. SECURITY CLASS

(THIS PAGE)

UNCLASSIFIED

21. NO. OF

PRINTED PAGES

79

22. Price $$9.50

USCOMM-DC
*