sufficient capacity to prevent overpressuring the system, and be adjusted
to ensure that [a pressure increase shall not cause unsafe operation of
connected and properly adjusted gas utilization equipment in a low-pressure
distribution system] [maximum pressure shall not exceed maximum allowable
operating pressure plus 41 kPa (gage) 6 psig in a high pressure system].
Each pressure relief valve shall meet the performance standards set forth
in ASME PTC 25.3, and shall be steel or cast iron.
2.3.2.3
Strainer
Provide to remove particulate matter from the gas stream and have a steel
or cast iron housing with a removable stainless steel strainer basket with
a mesh sized to remove particles that would interfere with regulator valve
operation.
2.3.3
Valve Boxes
Provide each valve on buried piping with a plastic or cast-iron valve box
of a size suitable for the valve. Valve box shall have a round cover with
the word "Gas" cast on it. Valve boxes shall be provided with lock-type
covers that require a special wrench for removing. Each cast-iron box
shall be given a heavy coat of bituminous paint.
2.3.4
Drips
Install at low points where indicated. Conform to details indicated or
provide commercial units of the same capacity and type as those indicated.
2.4
GAS SERVICE LINE VALVES AND ACCESSORIES
**************************************************************************
NOTE: When gas main valve paragraphs are not
included in the job, include the applicable
information from those paragraphs in this paragraph.
**************************************************************************
**************************************************************************
NOTE: When valves are to be installed in RTR or PE
pipe or tubing, the project drawings shall include a
detail showing the anchors to be installed and the
technique to be used to ensure that no turning
torque is imposed on the pipe.
**************************************************************************
2.4.1
Valves
Provide plug or ball valves for service lines as specified for gas main
valves.
2.4.2
Valve Boxes for Curb Cocks
Provide each valve on buried piping with a valve box as specified for gas
main valves.
2.5
CASING PIPE
ASTM A 53, Grade A, Schedule [20] [30] [40] [60]. Coat as specified in
paragraph entitled "Shop-Applied Coatings for Buried Steel Pipe and
Fittings."
SECTION 02551N
Page 16
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