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Gas supply piping is to be sized and installed properly in order to provide a
supply of gas sufficient to meet the maximum demand without undue loss of
pressure between the meter and the boiler. Consult with the National Fuel Gas
Code ANSI Z223.1 for proper sizing of gas piping for various lengths and diameters.
Locate a drop pipe adjacent to, but not in front of the boiler. Locate a tee in the
drop pipe at the same elevation as the gas inlet connection to the boiler. Extend the
drop line with a nipple towards the floor and cap to form a sediment trap. Install a
shut off valve before the tee with sediment trap and a union after the tee before the
combination gas valve.
When installing the boiler, make sure a pipe compound resistant to the action of
liquefied petroleum is used. Check piping for leaks. Always check leaks with a water
and soap solution. DO NOT USE A FLAME FOR CHECKING GAS LEAKS
The boiler and its individual shut-off valve must be disconnected from the gas
supply piping during any pressure testing of that piping at test pressures in excess of
1/2 psi.
To check for gas
leaks, use a gas detec-
tor or apply a soap
solution to the joints.
DO NOT USE AN
OPEN FLAME!
Direction of flow
Manual Shutoff Valve
Height of shutoff valve above ground
level to conform to local codes, if any.
Note: Massachusetts state code requires
gas shutoff to be a tee handled gas cock.
Pressure Gauge Port
(1/8” NPT plugged)
1” X 1” X 3/4” Tee
Male Union 3/4” NPT
Burner Gas Train
Pipe Cap
3” MINIMUM
9. Gas Line Piping
INSTALLATION OF SEDIMENT TRAP AND BURNER SUPPLY