**November 21, 1997**

**Contract \# TW-0928**

**SPECIAL SPECIFICATION**

**SECTION 15475-S**

**[LAB CYLINDER GAS SYSTEMS]{.underline}**

[Page]{.underline}

[PART 1 - GENERAL]{.underline}

1.01 Description. 2

1.02 Submittals & Substitutions.. 2

[PART 2 - PRODUCTS]{.underline}

2.01 Stainless Steel Tubing. 3

2.02 Tube Fittings. 3

2.03 Ball Valves. 4

2.04 Cylinder Gas Manifolds. 4

2.05 Gas Pressure Regulators 4

[PART 3 - EXECUTION]{.underline}

3.01 Installation 5

3.02 Cleaning. 5

3.03 Testing. 5

**SPECIAL SPECIFICATION**

**SECTION 15475-S**

**LAB CYLINDER GAS SYSTEMS**

[PART 1   GENERAL]{.underline}

1.01 [DESCRIPTION OF WORK]{.underline}

> A. Work under this section of the specification shall consist of
> providing all labor, material, and equipment necessary for the
> complete and satisfactory installation of laboratory cylinder gas
> systems in accordance with the Contract Documents.

B.  Piping systems supplied from cylinders shall be Type 316 stainless
    steel with stainless steel fittings and valves.

1.02 [SUBMITTALS & SUBSTITUTIONS:]{.underline}

> A. Make submittals according to this Section, Section 15010-S, and
> Section 01300-S.

B. [Substitutions]{.underline}: only under provisions of Section 1600-S.

[PART 2   PRODUCTS]{.underline}

2.01 [STAINLESS STEEL TUBING]{.underline}

> A. Materials: Fully annealed, high quality, Type 316 seamless,
> stainless steel tubing, ASTM A-213. Hardness not to exceed Rb 80.
>
> B. Tubing shall be suitable for bending and flaring, and shall be free
> from scratches.
>
> C. Minimum wall thickness:
>
> Tubing Size Wall Thickness
>
> [(Inches)]{.underline} [(Inches)]{.underline}
>
> 1/4   0.035
>
> 5/16   0.049
>
> 3/8   0.049
>
> 1/2   0.065

2.02 [TUBE FITTINGS]{.underline}

> A. Manufacturer: Swagelok Co.; Solon, Ohio
>
> B. Description: Fitting shall be two ferrule flareless design.
> Forgings and straights shall have a machined shoulder or hex to allow
> for gaging of fitting.
>
> C. Materials: Stainless steel, Type 316 with carbon content limited to
> .05%. Stainless steel straights shall be machined from bar stock
> material procured to ASTM A-276. Shapes shall be manufactured from
> forgings or blanks. Stainless steel forgings shall be made from hot
> rolled material in accordance with ASME SA-182.
>
> D. Design: The fittings shall be of a \"grip type\" or \"swage type\"
> design. Fittings shall not substantially reduce wall thickness, torque
> the tube during make-up, or require disassembly for inspection after
> make-up. Tube fitting shall consist of four machined pieces. The
> sealing and gripping power of the installed fitting shall be such that
> a compensating action between ferrules will overcome commercial
> variations in tubing wall thickness, hardness, and diameter
> specifications.
>
> E. Gageability: Fittings shall allow for inspection for proper
> pull-up, after initial make-up, by the use of a precision \"no-go\"
> gage or spacer between the fitting nut and body. This gage shall be
> designed and manufactured by the manufacturer of the tube fittings.

2.03 [BALL VALVES]{.underline}

> A. Manufacturer: Whitey Co.; 318 Bishop Road; Highland Heights, Ohio.
>
> B. Type: Whitey Series 60, Type 316 stainless steel body, stem and
> ball. Provide with Swagelok tube fitting end connections.
>
> C. Design: A metallic coned disc spring shall load the ball seats to
> compensate for wear, and temperature and pressure changes. A support
> ring shall be used to contain the seat materials to protect against
> seat bulge, premature wear, and cold flow. Design of the valve shall
> insure against stem blow-out. The stem packing shall be two-piece,
> live-loaded chevron design. It shall be self-adjusting to compensate
> for packing wear and temperature and pressure changes. All seals shall
> be 100% tested by the manufacturer. Seat leakage shall not exceed 0.1
> scc/min at 1000 psig (68 bar). External leakage shall be tested at
> 1000 psig (68 bar) using a liquid leak detector. No observable leaks
> will be permitted. Valves shall be of three piece design. Removal of
> one body bolt shall allow the center body to swing out to facilitate
> welding, cleaning, and maintenance.

2.04 [CYLINDER GAS MANIFOLDS]{.underline}

> A. Cylinder gas manifolds shall be Owner furnished, Owner installed.

2.05 [GAS PRESSURE REGULATORS]{.underline}

> A. Gas pressure regulators shall be Owner furnished, Owner installed.

[PART 3   EXECUTION]{.underline}

3.01 [INSTALLATION]{.underline}

> A. Piping and valves shall be furnished and installed under this
> section. Piping shall terminate at the gas supply area with a cap.
> Cylinders will be Owner furnished and Owner installed. Piping system
> shall terminate at point of use as indicated on the Drawings.

B.  All joints in the tubing, except those at valves or equipment
    requiring screwed connections, shall be made of Swagelok fittings.
    Suitable adapters shall be used for installation of valves and other
    equipment provided with threaded connections. Do not use any
    compound such as pipe dope or white lead on screwed joints. Teflon
    tape may be used.

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c.  Fuel gas vents from regulators or PRVs shall be run full size ( min.
    ½ inch ) in non copper containing steel lines to the exterior of the
    building where they will terminate in a 90 degree fitting turned
    down to prevent the entry of water.

3.02 [CLEANING]{.underline}

> A. Gas systems are high purity systems. Cleaning shall be necessary to
> obtain the required gas quality. Piping, fittings and valves shall be
> factory cleaned to standards required for medical oxygen type piping
> and shall be sealed before shipment from the factory.
>
> B. Particular care must be exercised in the handling of all material
> and tools used in cutting or reaming to prevent oil and grease being
> introduced into the pipe, tube, or fitting. Where such contamination
> has occurred, the items affected must be replaced.

3.03 [TESTING]{.underline}

> A. The piping shall be tested for systems of maximum purity. The
> Contractor shall employ preliminary pressure tests outlined below.
>
> B. After erection of the tubing, but before installation of outlet
> valves, the line shall be blown clear by means of dry nitrogen.
>
> C. After installation of outlet valves, each section shall be subject
> to a test pressure of at least 1‑1/2 times the maximum working
> pressure, but not less than 50 pounds per square inch by means of dry
> nitrogen. This test pressure shall be maintained until each joint has
> been examined for leakage by means of Oxweld No. 23 Leak Test Solution
> or other nonfrothing solutions approved for this purpose.
>
> D. After completing the joint test, a final check for leakage shall be
> made by allowing the pressure to remain in the piping for at least
> 24 hours. This test shall include measurement of the temperature of
> the piping at the beginning and end of the test for accurately
> evaluating the relation of final initial pressures as a measure of the
> leak tightness of the piping. No pressure changes, other than that
> caused by temperature change, will be permitted.

END OF SECTION