-7 NATIONAL BUREAU OF STANDARDS REPORT

NBS PROJECT NBS REPORT

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IMPORTANT NOTICE

NATIONAL BUREAU OF STAF

intended for use within the Gc

to additional evaluation and rev

listing of this Report, either in the Office of the Director, Nati( however, by the Government af to reproduce additional copies

gress accounting documents Approved for public release by the alb Published it is subjected

, XT • • r

production, or open-iiterature

Director of the National Institute of n is obtained in writing from Standards and Technology (NIST) ich permission is not needed, on October 9, 2015.

U. S. DEPARTMENT OF COMMERCE

NATIONAL BUREAU OF STANDARDS
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bulkhead assemblies were gub4#etsd to

a standard fire test# The two differed as to

thickness of marine board itnd joint details*

B.ach served as a barrier to flam© p-assage for

tlw rt^ulr@4 SO min, but neither prevented ©excessive temperature rise on the unexposed surface wlthiii the initial min*

1* Introduction

At the request of the d* S. Coast Guard (letter of

16 January I%2, 2C4t, JJ/l6^*00SAi), two bulkhead speeimoas

were subjected to fire test- la eomplisaco with Suhpart

i6^.00S-3(b; of Specifications for Bulkhead famia for

^lerchant ¥©ssei$.

2. Test w^pcclmeas

t The specimens were submitted by the Jaisa Asbestos and

Rubber Company*- The mat«sriais were delivered to the Satioaal

Bureau of Btaadards where they were assembled by representatives of the submitter* .Each speciaen, when assembled, consisted of tw© pieces of Inarcohoiprd 36 with'h vertical Joint

between, a metal Joint meitaber system, mms a metal frame* The

vertical edges of the mriae boards were sanded to a slight

taper to prevent a binding fit in the metal components*

details of the assemblies are shown in Figure 1*

.measurements made on each piece of the marine board

when received indicated the followings
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a 95-31/32 29-31/32 .865 36.S

Leagtii aad .wldtM average of 5 a^easurfeaeats to nearest

1/32 in., taiekn^es average of 15 aieroiaater readings.

Pieces i''‘enfil 5 were used in tha wldtli received | pieces

3 and 7 were cut to 17-lA in. width. The mmTlm boards were

white and moderately hard.

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The speciffteas were mounted «: in two opeaiiigs of a test fraiae

arranged to perrslt the siaultaneous fir© exposure of three

bulkheads in the test furnace, fh# third opeiiiEg was

filled with an insulated me tai'- panel.

Care was taken that each specimen was restraiae4 against

vertical movement, so that the only relief from thermsl expansion would be that provided for in the design and fabrication

of th© speclaeas. - . Tii© peripheral joints between the franc of

each specimen and the test frame opening were sealed with a

fillet of piasUx. This plaster fillet coYered ail metal on

the exposed surface except the vertical ioiat memhet between

the two pieces of tfnarceboard 36 .
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Eight thesrmocouples were placed on the imexposed surface

of each specimen, distributed as shoim in Figure X, Each

thermocouple Junction and several inches of its lead Viires

were covered by a 6^* by 6- by 0.4**ln* felted asbestos pad.

i'weive thermoGoupies, encased in porcelain insulators and

Iron, piiies, were distributed within the furnace chasiber.

The furnac© fires were controlled to produce average furnace

temperatures as close as feasible to those of the standard

time-teiHperature carve of 4SfM E-Ilf, which includes 1000

at 5 siin, 1300®F at 10 sd.n, at 30 min and 1700^F at

1 hr.

h. Hesuits

The test was conducted on February 15, 196-2 and witnessed

by tli© followings

Paul c1-ibson, USCu

David J. Lime, 03CG

W. K. Dempsey, MA

A . M* i^Qompt @

L. hanbury, FFC

1. h. ffaender, TJnion Asbes.Co.

W. f. Glnciair,

A. ¥. 3u«ers

a. Wilde

A. F. Buquor, Martin Parry Co.

Throughout the test, the flames In the furnace were lumi

nous and well distributed. The first cracks, observed at

28 min, were across tha botto® corners of the wide piece of

7/8 in. -thick board. By 31 iiiin, there were iia,tehiiig cracks

on the unexposed and exposed surfaces, but the former were

very fine and remined so for the rest of the test. There

were no further changes and, the test was stopped after the

60-mlaute temperature readings.

Both specliaens continued as satisfactory barriers to

flame passage throughout the 1-lir test, there having been

o.nly two hairline cracks in the 7/8-in. thick specimen and

none in the 3/k-in. thick speci,men. The liraitlag temperature

rise of 250®F, at ai3y thermocouple o,n tha unexposed surface

of the mari.ne board, was reached at IQ. 2 mimtes for the

3/4-in. board and at 13. v minutes for the //3^in. board. The

fire exposure severity was 100.2 percent. Additional temperature dat-a are represented in Figure 1.
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The results of the test indicated a^e^berrier

r-artlcular speciraens tested was a satisfaetor/ ilaSie Darner

lironftoul bit that the inciting

ranched at l^.2^ain for the 3A-in. board and at i, . 3,/. _;,4a

for tiie 7/8-in. board.

^ NeithSr the contents of tMs report

the tests were aade at the flationai bureau of ot^andaros snail

be- used for advertising or promotioxiax purposes.

For the Director

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by

A. F. Bober t son. Chief

Fire Hesearch Section

TG 10230-21 5 FR3611

i%rch 12, 1962

J, V. Ryan

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