installation. When valves, gas pressure regulators,
and related devices are required in the contract,
ensure that all necessary equipment will comply with
the requirements of the gas company, and revise
these paragraphs as required. Provide a detail of
each regulating station and the following data for
each pressure regulator: materials of construction,
flow rate, type and specific gravity of the gas,
inlet and outlet pressures, accuracy of control, and
size and type of connections.
**************************************************************************
Valves shall be suitable for shutoff or isolation service and shall conform
to the following:
2.2.1
Steel Valves
Steel valves 40 mm (1-1/2 inches) 1-1/2 inches and smaller installed
underground shall conform to ASME B16.34, carbon steel, socket weld ends,
with square wrench operator adaptor. Steel valves 40 mm (1-1/2 inches)
1-1/2 inches and smaller installed aboveground shall conform to ASME B16.34,
carbon steel, socket weld or threaded ends with handwheel or wrench
operator. Steel valves 50 mm (2 inches) 2 inches and larger installed
underground shall conform to API Spec 6D, carbon steel, buttweld ends,
Class [_____] with square wrench operator adaptor. Steel valves 50 mm (2
inches) 2 inches and larger installed aboveground shall conform to API Spec
6D, carbon steel, buttweld or flanged ends, Class [_____] with handwheel or
wrench operator.
2.2.2
Steel Valve Operators
Valves 200 mm (8 inches) 8 inches and larger shall be provided with worm or
spur gear operators, totally enclosed, grease packed, and sealed. The
operators shall have Open and Closed stops and position indicators.
Locking feature shall be provided where indicated. Wherever the lubricant
connections are not conveniently accessible, suitable extensions for the
application of lubricant shall be provided. Valves shall be provided with
lubricant compatible with gas service.
2.2.3
Polyethylene Valves
Polyethylene valves shall conform to ASME B16.40. Polyethylene valves, in
sizes 15 mm to 150 mm (1/2 inch to 6 inches), 1/2 inch to 6 inches, may be
used with polyethylene distribution and service lines, in lieu of steel
valves, for underground installation only.
2.3
PRESSURE REGULATORS
**************************************************************************
NOTE: Coordinate this paragraph with the specified
requirements in paragraph VALVES.
**************************************************************************
Regulators shall have ferrous bodies, shall provide backflow protection,
and shall be designed to meet the pressure, load and other service
conditions.
SECTION 02556A
Page 14
Previous Page
