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DRAFT GUIDELINE ON DOMESTIC GAS PIPING SYSTEM
American Society of Mechanical Engineers Standards:
ASME B31.8 – Gas Transmission and distribution piping systems
(The code covers the design, fabrication, installation, inspection, testing,
and safety aspects of operation and maintenance of gas transmission and
distribution systems, including gas mains and service lines up to the
outlet of the customer’s meter set assembly.)
PLANNING FOR PIPED GAS SYSTEM
When planning or designing the gas piping or reticulation system, the following aspects
must be determined or verified in advance in order to ensure the system meets all safety
and technical requirements of the legislation and standards as well as it is able to deliver the
required quantity of gas:
o For natural gas supply systems, confirmation on the availability of gas distribution line
infrastructure and the required supply pressure must be obtained from the licensed
gas supplier.
o Total gas consumption volume of gas appliances (maximum gas volume per hour)
must be determined based on existing and anticipated future appliance demands.
o Operation pattern of gas appliances (coincidence factor)
o Supply pressure required for the proper operation of the gas appliance.
o The locations of gas appliances.
o Suitable space or compartment in the housing area, building and users’ premises that
is required for the gas piping system installation.
o The land or space in the housing area or building that is required for natural gas
regulating station or LPG storage system.
o When the additional piping is to be connected to existing piping, the existing piping
must be checked to determine if it has adequate specifications and capacity for the
new demand.
GAS DEMAND DETERMINATION
The volume of gas accounted for shall be determined from either the manufacturer’s input
rating, gas supplier, equipment manufacturer or a competent personnel. Estimation on
equipment’s rating is as shown below (Table 11, MS 930).
Minimum Demand of Typical Gas Appliances in BTUs Per Hour
Appliance Demand in BTU/hour
Barbecue (residential) 50,000
Domestic Clothes dryer 35,000
Domestic Gas Range 65,000
Domestic Recessed Oven Section 25,000
Gas Refrigerator 3,000
Storage Water Heater up to 30 gallon tank 30,000
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