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Sediment Traps
Contaminants in gas lines can
cause fire or explosion.
• Clean all gas piping before
installation.
• Install drip leg in accordance
, _ , with NFPA 54.
Contaminants in the gas lines may cause improper operation
of the gas control valve that may result in fire 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.
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 fitting with a capped
nipple in the bottom outlet or other device recognized as an
effective sediment trap. If a tee fitting is used, it shall be installed
in conformance with one of the methods of installation, shown
in Figures 19 and 20.
GROUND JOINT -__T_(
UNION GAS CONTROL
(OPTIONAL) VALVE
rnm)_ DRIP LEG
3" MIN. _ (SED_F_(76.2
CAP
FIGURE 19. GAS PIPING WITH FLEXIBLE CONNECTOR.
UNION BLACK PIPE
(OPTIONAL)
3" MIN, ' DRIP LEG
(76.2 mm) (SEDIMENT TRAP)
GAS
CONTROL
VALVE
CAP
FIGURE 20. GAS PIPING WITH ALL
BLACK IRON PIPE TO GAS CONTROL,
17