Sediment Traps
cause fire or explosion.
|
| • | Clean | all | gas | piping before |
|
|
| installation. |
|
| |
|
|
| Contaminants in gas lines can | |||
|
| • | 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.
UNION |
| GAS CONTROL |
(OPTIONAL) |
| VALVE |
GROUND JOINT |
| |
(763".2MIN. | _ | (SED F |
rnm)_ |
| DRIP LEG |
| CAP |
|
FIGURE 19. GAS PIPING WITH FLEXIBLE CONNECTOR.
UNION | BLACK PIPE |
(OPTIONAL)
GAS
CONTROL
VALVE
3" MIN, ' | DRIP LEG |
(76.2 mm) | (SEDIMENT TRAP) |
| CAP |
FIGURE 20. GAS PIPING WITH ALL
BLACK IRON PIPE TO GAS CONTROL,
17
