State GS6 75 URRBS - Manual (Page 15)

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Use pipe joint compound or tefl on tape marked as being resistant
to the action of petroleum gases.
The water heater and its gas connection must be leak tested before
placing the appliance in operation.
The water heater 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 (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.
SEDIMENT TRAP
SEDIMENT TRAP
FIGURE 13. GAS PIPING WITH FLEXIBLE CONNECTOR.
FIGURE 14. GAS PIPING WITH ALL
BLACK IRON PIPE TO GAS CONTROL.
SEDIMENT TRAPS
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 sediment trap must
be incorporated in the piping. The sediment trap 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.