July 22, 1994

Contract #TW0592

SPECIAL SPECIFICATION

SECTION 15K-S

[COMPRESSED GAS PIPING - INTERIOR]{.underline}

Page

15k-01 SCOPE 2

15K-02 MATERIALS 2

15K-03 EQUIPMENT 4

15K-04 PIPING INSTALLATION. 4

15K-05 PIPE CLEANING. 6

15K-06 COMMISSIONING 6

15K-07 TESTS. 6

SPECIAL SPECIFICATION

SECTION 15K-S

[COMPRESSED GAS PIPING - INTERIOR]{.underline}

# 15K-01. SCOPE

a\. [Included:]{.underline} Materials and operations required for the
installation of interior medium to low pressure compressed gas piping
systems, including argon (AR), , nitrogen (N~2~), Deuterium exhaust
(D2), , and acetylene piping , fittings, valves, equipment, joints, and
tests. Helium piping shall be provided as specified on Drawings.

b\. [Submittals]{.underline}:

\(1\) Make submittals according to this Section, Section 01300, and
Section 15010.

\(2\) Submit product data on relief valves and regulators for approval.
Submit product data on valves that differ from specified valves.

\(3\) Submit installation instructions for relief valves and regulators.

# 15K-02. MATERIALS. Materials shall be as follows unless otherwise indicated on the applicable contract drawings. Pipe and fittings to be used for modifications or additions shall be the same material (steel or copper) as the existing systems being modified but shall conform to the following unless otherwise indicated on the applicable contract drawings.

a\. Argon, and Nitrogen Systems (100 psig and under):

\(1\) [Piping]{.underline}: Type L, hard drawn copper tubing, ASTM
B88-72, or schedule 40 Type 316 stainless steel, seamless or welded,
ASTM A316 .

\(2\) [Fittings]{.underline}: Wrought copper and bronze solder-joint,
ANSI B16.22-63; or 2000 pound forged steel socket weld, ANSI B16.11-80 .

\(3\) [Valves]{.underline}:

> [Ball]{.underline}: Worcester No. 416T, brass body, stainless steel
> ball and stem, teflon seat, 250 p.s.i. maximum working pressure.

b\. [Oxygen Systems (50 psig and under)]{.underline}: NOTE: Oil and
oxygen may combine with explosive violence.

\(1\) [Piping]{.underline}: Type L hard drawn copper tubing, ASTM B88-72
or Schedule 40 black steel, seamless, ASTM A120-72a.

\(2\) [Fittings]{.underline}: Wrought copper and bronze solder-joint,
ANSI B16.22-63; or 2000 pound forged steel socket weld, ANSI B16.11-66
(cast iron not permitted).

\(3\) [Valves]{.underline}:

> [Ball]{.underline}: Worcester No. X416T, brass body, stainless steel
> ball and stem, teflon seat, cleaned and packaged for oxygen service,
> 250 p.s.i. maximum working press.

c\. [Acetylene Systems (15 psig and under)]{.underline}: NOTE: Contact
between acetylene and unalloyed copper should be avoided, since the
explosive compound, copper acetylide, might be formed.

\(1\) [Piping]{.underline}: Schedule 40 black steel, seamless Grades A
or B, ASTM A53-72a.

\(2\) [Fittings]{.underline}: 2000 pound forged steel socket weld, ANSI
B16.11-66. (Cast iron not permitted).

\(3\) [Valves]{.underline}: Crane No. 1652 (Underwriters\' Approved) 15
p.s.i. rating, 180° F. maximum.

d\. Deuterium Exhaust (Atmos)

\(1\) [Piping]{.underline}: Schedule 40 black steel, seamless Grades A
or B, ASTM A53-72a.

\(2\) [Fittings]{.underline}: 2000 pound forged steel socket weld, ANSI
B16.11-66.

\(3\) [Valves]{.underline}:

[Ball]{.underline}: Worcester No. 416T, brass body, stainless steel ball
and stem, teflon seat, 250 psi maximum working pressure. [15K-03.
EQUIPMENT.]{.underline} All major items of equipment required for
installation on this contract shall be as specified on the applicable
contract drawings and shall be furnished complete with all accessories
normally supplied with the catalog item listed and all other accessories
necessary for a complete and satisfactory operating system.

a\. [Relief Valves]{.underline}: Shall be ASME constructed and stamped.
Size, capacity and setting shall be as indicated on the drawings.
Discharge from relief valves shall be piped full size and extended to
the outside where required.

b\. [Regulators]{.underline}: Size, capacity, and setting shall be as
indicated on the drawings.

## [15K-04. PIPING INSTALLATION.]{.underline}

a\. [General]{.underline}: Piping installation shall be coordinated with
respect to space available with heating, ventilating and electrical
installation. In every instance where there is a conflict in the routing
of the piping and the ducting, the routing of the ducting shall govern.
Installed piping shall not interfere with the operation or accessibility
of doors or windows; shall not encroach on aisles, passageways, and
equipment; and shall not interfere with the servicing or maintenance of
equipment. Pipe shall be cut accurately to measurements established at
the construction site and shall be worked into place without springing
or forcing, properly clearing all openings and equipment. Cutting or
weakening of structural members to facilitate piping installation is not
permitted. Pipes shall have burrs removed by reaming and shall be so
installed as to permit free expansion and contraction without damage to
joints or hangers. Piping above ground shall be run parallel with the
lines of the building unless otherwise noted on the drawings.

> Piping connections to equipment shall be in accordance with details
> shown on the drawings. Service pipe, valves, and fittings shall be
> kept a sufficient distance from other work to permit finished covering
> not less than 1/2 inch from such other work, and not less than 1/2
> inch between finished covering on the different services.

b\. [Reducers]{.underline}: Reduction in pipe sizes shall be made with
one-piece reducing fittings. Bushings reducing at least two pipe sizes
will be acceptable only when there is no room for reducing couplings or
swagged nipples.

c\. [Unions]{.underline}: All piping unions shall be of the ground joint
type constructed from materials equivalent in alloy composition and
strength to other fittings specified with which they are used. Union
pressure classes and end connections shall be the same as the fitting
used in the lines with the unions.

> Steel unions shall have hardened stainless steel seating surfaces on
> both faces.

d\. [Installation of Valves]{.underline}: Valves shall be installed at
the locations shown on the drawings and where specified. All valves
shall be installed with their stems horizontal or above.

e\. [Pipe Hangers]{.underline}: Unless otherwise noted on the drawings,
horizontal overhead runs of pipe shall be hung with adjustable
wrought-iron or malleable-iron pipe hangers, spaced not over 8 feet
apart. Tubing shall have hangers spaced not over 5 feet apart. Chain
strap, perforated-bar, or wire hangers will not be permitted. Trapeze
hangers may be used in lieu of separate hangers on pipes running
parallel to each other and close together. All hangers shall have short
turnbuckles or other approved means of adjustment, and should be
suspended from structural members. Hangers and collars shall be of a
size proportionate to the weight of the pipe supported. Seismic pipe
restraints are required as specified on the Pipe Support Drawings..
Copper pipe hangers shall be copper or copper plated. Piping in tunnels
or chases shall be supported on Unistrut or approved equal, as indicated
on the drawings.

f\. [Joints]{.underline}:

\(1\) [Screwed Joints]{.underline}: Screwed pipe joints shall have
American Standard Taper Pipe Threads ANSI B2.1-68. Burrs formed when
cutting pipe shall be removed by reaming. Care shall be taken that the
inside of pipe is thoroughly clean and free of cutting oil and foreign
matter before installation. Joints shall be made perfectly tight by the
use of Teflon tape or approved Teflon thread sealing and lubricating
compound.

\(2\) [Solder-Joints]{.underline}: Tubing shall be cut square and burrs
removed. Both inside of fittings and outside of tubing shall be well
cleaned with steel wool or wire brush before sweating. Care shall be
taken to prevent annealing of fittings and hard drawn tubing when making
connections. Joints for sweated fittings on low pressure piping (150
psig and below) shall be made with a noncorrosive paste flux and solid
wire solder composed of 95 percent tin and 5 percent antimony. Cored
solder will not be permitted.

\(3\) [Welded Joints]{.underline}: Joints between sections of pipe and
between pipe and fittings may be welded using either gas or electric
welding equipment. All pipe surfaces shall be thoroughly cleaned before
welding. Each joint, except socket-weld joints, shall be beveled before
being welded. The Contractor shall provide an asbestos mat or blanket to
protect the structure and adequate fire protection equipment at all
locations where welding is done. All elbows shall be long radius where
space conditions allow. Wherever tee connections are made to piping
systems on the main run, welding sockets or weldolets may be used in
lieu of reducing outlet tees for branch connections up to one-half the
size of the main run. On connections larger than one-half the size of
the main run, welding tees shall be used. The use of fittings formed
from welded pipe sections will not be permitted. All welding shall
conform with \"General Material and Work Requirements, Mechanical\"
section of these specifications.

## [15K-05 PIPE CLEANING.]{.underline}

Unless otherwise amended on the drawings, the requirements in this
section pertain with one exception: if refrigeration grade piping is
utilized, these cleaning requirements are limited to oxygen systems
only.

a\. [Before Installation]{.underline}: All piping, tubing, valves and
fittings are to be thoroughly cleaned as follows:

\(1\) Copper lines (unless furnished precleaned and capped) shall be
washed in a solution of tri-sodium phosphate (1 pound to 3 gallons of
water, rubber gloves required). Scrubbing to be employed as required to
assure removal of dirt, metal filings, oil and grease. After washing,
materials to be rinsed in clear, hot water. After drying, materials
shall be plugged or capped until assembly.

\(2\) Black steel lines, before assembly, shall be hammered to loosen
scale and wire brushed inside as required. Following scale removal pipe
shall be cleaned and stored as described for copper until assembly.

b\. [After Installation]{.underline}: Completed oxygen piping systems
shall be thoroughly flushed internally with a solution of tri-sodium
phosphate (1 pound to 3 gallons of water, rubber gloves required) to
remove any traces of oil due to piping assembly, flush-rinsed with clear
hot water, dried and capped.

[15K-06 COMMISSIONING]{.underline}

a\. Provide labor, material, equipment, etc., required to facilitate the
commissioning process. Perform form tests and verification procedures
required by the commissioning process when requested by the
commissioning Authority and directed by the General Contractor. See
Section 15995.

## [15K-07l. TESTS.]{.underline}

a\. [General]{.underline}: All piping, equipment, and accessories
installed under this contract shall be inspected and tested by the
Contractor in the presence of the Inspector, and approved before
acceptance. All labor, material, and equipment required for testing
shall be furnished by the Contractor. The Contractor shall be
responsible for all repairs and retesting as required. All instruments
and other equipment whose safe pressure range is below that of the test
pressure shall be removed from the line or blanked off before applying
the tests.

b\. [Testing]{.underline}: Compressed gas piping shall be tested at the
test pressures specified and shall not exceed the following drop in
pressure in a 24 hour period. Use F-12 and an electronic leak detector
to locate leaks in systems that allow no press drop in a 24 hour period.
All other system leaks shall be located by soap testing.

[Compressed Gas]{.underline} [Test Pressures]{.underline} [Test
Gas]{.underline} [Max. Pressure Drop]{.underline}

(24 hrs)

[Nitrogen Systems]{.underline} 150 psig Nitrogen 5 p.s.i.

[Argon Systems]{.underline} 150 psig Argon 5 p.s.i.

[Oxygen Systems]{.underline} 150 psig Argon 5 p.s.i.

[Acetylene Systems]{.underline} 200 psig Nitrogen None

[Deuterium Exhaust Sys]{.underline} 50 psig Nitrogen None