Riva Plus Manual
28
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.
Direction of flow
B
A
F
E
D
C
Figure 11.1
A) Manual T-handle Shutoff Valve
B) Pressure Gauge Port
C) Flexible Gas Line to Burner
D) Male Union ¾” NPT
E) Pipe Cap
F) 1” X 1” X ¾” TEE
Note: Height of valve above ground level to
conform to local codes, if any.
Massachusetts statecode requires
gas shut off to be a tee handled gas
cock.
Locate a drop pipe adjacent to, but not in front of the boiler. Locate a tee (F) 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 (E). Install a shut off valve (A) before
the tee with sediment trap and a union after the tee before the combination gas valve (D).
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.
The boiler and its gas connection must be leak tested before placing the boiler in operation.
The boiler and its individual shutoff valve must be disconnected from the gas supply piping
system during any pressure testing of that system at test pressures in excess of 1/2 psi (3.5
kPa).
11. Gas Pipe Connections
WARNINGS
DO NOT USE A FLAME FOR CHECKING GAS LEAKS
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