Regulators for liquified petroleum gas shall be adjusted to 2.5 to 3 kPa
(10 to 12 inches of water column). 10 to 12 inches of water column.
Pressure relief for liquified petroleum gas shall be set at 4 kPa (16
inches of water column). 16 inches of water column. Regulator shall have
single port with orifice diameter no greater than that recommended by the
manufacturer for the maximum gas pressure at the regulator inlet.
Regulator valve vent shall be of resilient materials designed to withstand
flow conditions when pressed against the valve port. Regulator shall be
capable of regulating downstream pressure within limits of accuracy and
shall be capable of limiting the buildup of pressure under no-flow
conditions to 50 percent or less of the discharge pressure maintained under
flow conditions. Regulator shall have a self contained service regulator.
Regulator pipe connections shall not exceed 50 mm (2 inch) 2 inchsize.
2.4
METERS
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NOTE: Provide gas meters for each service line to
every building. Where meters have a maximum
anticipated demand of less than 28 cubic meters/hour
(1000 SCFH), require the meter to meet a design
working pressure of 690 kPa (100 psi).
Delete mounting and special features that are not
required. Retain strainer upstream of meter only if
installed upstream of pressure regulator. Delete
pulse switch and pulse requirements except for Air
Force projects or when required by other users. Air
Force Engineering Technical Letter Number 87-5
"Utility Meters in New and Renovated Facilities"
provides guidance for when to exclude meters from
Air Force new and major renovation projects. Review
the requirements for gas meters in TI 800-01 Design
Criteria and 10 CFR 435.
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Meters shall conform to AGA B109.2. Meters shall be [pipe] [pedestal]
mounted [and be provided with a strainer immediately upstream]. [Meters
shall be provided with [over-pressure protection as specified in ASME B31.8
] [tamper-proof protection] [frost protection] [fungus-proof protection].]
Meters shall be suitable for accurately measuring and handling gas at
pressures, temperatures, and flow rates indicated. Meters shall have a
pulse switch initiator capable of operating up to speeds of 500 pulses per
minute with no false pulses and shall require no field adjustments.
Initiators shall provide the maximum number of pulses up to 500 per minute
that is obtainable from the manufacturer. It shall provide not less than
one pulse per 2.83 cubic meter (100 cubic feet) 100 cubic feet of gas.
2.5
EARTHQUAKE ACTUATED AUTOMATIC GAS SHUTOFF SYSTEM
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NOTE: Include earthquake actuated automatic gas
shutoff system if the facility is either essential
or hazardous and is located within Seismic Zone 3 or
4. The designer will determine the classification
of the facility per TM 5-809-10 and provide a detail
on the drawings showing this system.
ASCE has developed a "Public-Approved Version" of
SECTION 02556A
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