This gas piping schematic details the distribution from the gas meter through a Koso earthquake valve and into main lines sized at three inches. The network feeds two boilers designated B-1 and B-2 at twenty-hundred MBH each, a make-up air unit at five-hundred MBH, a gas water heater designated GWH-1 at two-hundred fifty MBH, and a kitchen connection at thirty-hundred MBH. Each boiler branch includes a pressure-reducing valve rated for one pound per square inch inlet and ten inches water column outlet at twenty-hundred cubic feet per hour. The gas water heater branch incorporates a pressure-reducing valve rated for one pound per square inch inlet and seven inches water column outlet at two-hundred fifty cubic feet per hour. Piping sizes range from one-half inch at equipment drops to three-quarters inch, one inch, two inches, and three inches along main branches.
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