Sediment Traps; Gas Piping - Lochinvar COMMERCIAL GAS WATER HEATERS Instruction Manual

Use pipe joint compound or tefl on tape marked as being resistant
to the action of petroleum [Propane (L.P.)] gases.
The appliance and its gas connection must be leak tested before
placing the appliance in operation.
The appliance and its individual Shut-off valve shall be disconnected
from the gas supply piping system during any pressure testing of
that system at test pressures in excess of 1/2 pound per square inch
FIGURE 13. GAS PIPING WITH
FLEXIBLE CONNECTOR.

SEDIMENT TRAPS

(3.5 kPa). It shall be isolated from the gas supply piping system
by closing its individual manual Shut-off valve during any pressure
testing of the gas supply piping system at test pressures equal to
or less than 1/2 pound per square inch (3.5 kPa).
Connecting the gas piping to the gas control valve of the water
heater can be accomplished by either of the two methods shown in
Figures 13 and 14.
FIGURE 14. GAS PIPING WITH ALL
BLACK IRON PIPE TO GAS CONTROL.
A sediment trap shall be installed as close to the inlet of the water
heater as practical at the time of water heater installation. The
sediment trap shall be either a tee fi tting with a capped nipple in the
bottom outlet or other device recognized as an effective sediment
trap. If a tee fi tting is used, it shall be installed in conformance with
one of the methods of installation shown in Figures 13 and 14.
Contaminants in the gas lines may cause improper operation of the
gas control valve that may result in fi re or explosion. Before attaching
the gas line be sure that all gas pipe is clean on the inside. To trap any
dirt or foreign material in the gas supply line, a drip leg (sometimes
called a sediment trap) must be incorporated in the piping. The drip
leg must be readily accessible. Install in accordance with the "Gas
Piping" section. Refer to the current edition of the National Fuel Gas
Code, ANSI Z223.1/NFPA 54.
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