Project Name
Project Number
UEPH Complex
Statement of Work
26 November 2001
her responsibility.] Provide a gas distribution system, connected to existing systems and
designed in accordance with local codes, utility company requirements, or installation
regulations, whichever is more stringent. Gas distribution systems shall comply with the
requirements of ASME B31.8. Connection to existing gas distribution system shall be made at
the location shown on the enclosed RFP drawings. When connecting to existing steel piping
system, provision shall be made to ensure that the integrity of the cathodic protection is not
compromised. Shutoff valves shall be provided on the exterior of each building. A gas regulator
and provision for future installation of an individual gas meter to monitor fuel use shall be
provided for each building structure. The building service entrance shall be installed at a height
sufficient to allow for future installation of the gas meter. Existing lines that are to be
abandoned shall be either removed or physically disconnected from all gas sources and purged.
Abandoning existing gas piping shall be done in accordance with ANSI B31.8, Gas
Transmission and Distribution Piping Systems. Installation of gas piping will be in accordance
with ANSI B31.8 and 49 CFR 192.
4-14.1 Materials. Materials and appurtenances shall be free of defects and suitable to
accomplish the stated objectives of gas distribution systems. Pipe shall be polyethylene or steel
as described below.
4-14.1.1 Polyethylene pipe. Shall conform to ASTM D2513, Standard Specification for
Thermoplastic Gas Pressure Piping Systems, with fittings complying with either ASTM D2513 or
ASTM D2683, Standard Specification for Socket-Type Polyethylene Fittings for Outside
Diameter-Controlled Polyethylene Pipe and Tubing. Connections to metal pipe shall comply
with ANSI B16.5, Pipe Flanges and Flanged Fittings, or manufacturer's recommended
standards.
4-14.1.2 Steel pipe. Shall conform to ASTM A 53, Grade A or B, Type E or S, Schedule 40.
Furnace butt welded pipe may be used in sizes 40 mm [1-1/2 inch] and smaller. Fittings 40 mm
[1-1/2 inch] and smaller shall conform to ASME B16.11. Pipe flanges and flanged fittings larger
than 40 mm [1-1/2 inch], including bolts, nuts, and bolt patterns shall be in accordance with
ASME B16.5, Class 150. Butt weld fittings shall be in accordance with ASME B16.9. Weld
neck flanges shall be used.
4-14.2 Testing. Prove that the entire system of gas mains and service lines is gas-tight by an air
test, in accordance with ANSI B31.8. The test shall continue for at least 24 hours between
initial and final readings of pressure and temperature.
4-14.3 Drips. Unless high pressure natural gas is used, drips shall be installed at the low
points, immediately following reduction from high pressure to medium pressure (at supply
points) and at occasional low points throughout the system to provide for blowing out the lines.
4-14.4 Valves. Plug valves shall be installed at intersections of mains and other locations so
that interruptions to service can be confined to no more than one building.
4-14.5 Mains and service lines. Lines shall not be placed under any buildings. Lines shall be
placed with a minimum of 0.6 m [2 ft] of earth cover. Protective casings shall be provided to
protect lines from superimposed street or heavy traffic loads.
4-15
HEATING HOT WATER [AND CHILLED WATER] DISTRIBUTION. [Insert
"DELETED" if not applicable and delete remainder of text in all paragraphs.] Prefabricated
piping system shall be installed to supply and return heating hot [and chilled] water to
mechanical equipment rooms. Metallic pressure pipe, fittings, and piping accessories shall
conform to the requirements of ASME B31.1 and shall be types suitable for the temperature and
pressure of the water.
SOW-94
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