Section: FUEL GAS SUPPLY
12
LGPS
HGPS
S
(IF USED)
DRIP LEG
BURNER
METER
MSC
SSOV1
PRSSOV
MLTC
U
TC
U
TC
TC
U
PG
REGULATOR
GAS UTILITY PIPING
FACILITY PIPING
GAS TRAIN
BURNER
ABBREV.
HGPS
LGPS
MSC
MLTC
PG
S
SSOV1
TC
U
PRSSOV
ITEM DESCRIPTION
HIGH GAS PRESSURE SWITCH
LOW GAS PRESSURE SWITCH
MAIN SHUTOFF COCK
MAIN LEAK TEST COCK
PRESSURE GAUGE
STRAINER
SAFETY SHUTOFF VALVE #1
TEST COCK
UNION
PRESSURE REGULATING SAFETY
SHUTOFF VALVE
Figure 8 –
Typical Gas Piping Layout
The gas supply system must be sized to deliver at least
the minimum required pressure to the gas train inlet.
Contact your local gas utility for verification of gas
pressures, allowable pressure drops, and any local piping
code requirements.
If using current facility piping already in place, verify
the following:
|
Piping design meets all applicable codes.
|
Piping and components are inspected and in good
working condition.
|
Piping is sized correctly to supply required gas
pressure to the burner and any other gas appliances
in the facility.
|
Any new branches in the supply piping must
be pressure tested as outlined in ANSI Z223.1 /
NFPA 54.
For new facility piping, follow the pipe sizing methods
and tables for pipe sizing as outlined in ANSI Z223.1 /
NFPA 54.
All gas piping installation must
comply with the latest edition
of the National Fuel Gas Code ANSI Z223.1 (NFPA
54) and other applicable local codes.
Explosion, Fire, and Gas
Leak Hazard
•
Do not disassemble gas valve.
•
Valve must be installed with the gas flow in the
same direction as the arrow.
Explosion, Fire, and Gas
Leak Hazard
Do not use Teflon tape on gas piping. Damage
to gas valve cutoff seals and valve bodies could
cause gas leaks.
•
Pieces of tape can be cut loose during
installation and lodge in gas valves causing cutoff
seal problems.
•
Teflon tape ‘lubricates’ pipe threads, allowing
iron pipes to penetrate too deeply into aluminum
valve bodies causing distortion and leakage.
•
Use only pipe sealant compounds that are
resistant to the gas being used.
Explosion, Fire, and Gas
Leak Hazard
A Drip Leg is required in gas supply piping.
Foreign matter could lodge in gas valve cutoff
seals, resulting in gas leak-through, explosion
or fire.
Install a full-size drip leg or dirt pocket in the piping
directly ahead of the main shutoff valve to capture
foreign matter.
New facility piping must be pressure tested in
accordance with ANSI Z223.1 / NFPA 54.
A leak test must be performed on supply piping
immediately after gas is turned back on. Any leaks must
be fixed before continuing with the installation.
