64659-001 REV. A 07/06/18
10
Sizing and Inspection of Gas Piping
The gas piping must be properly sized to deliver adequate gas pressure to the burner during operation
of the burner and any other gas appliances. The information supplied herein is to be used as a guideline
for the proper sizing and configuration of the gas piping system. All piping must comply with local codes
and ordinances or the National Fuel Gas Code ANSI Z223.1/NFPA No. 54. A sediment trap or drip leg
must be installed in the supply line to the burner. A union shall be installed in the gas line upstream
from the control manifold and downstream from the sediment trap or drip leg (See Figure 4). A 1/8” NPT
plugged tapping port accessible for test gauge connection shall be installed immediately upstream of the
gas supply connection for the purpose of determining the gas supply pressure to the burner. A manual
shutoff valve shall be installed in the gas supply line external to the appliance (See Figure 3).
The piping should be so installed as to be durable, substantial and gas tight. It should be clear and free
from cutting burrs and defects in structure or threading. Aluminum tubing should not be used for
the main gas supply. Joint compounds (pipe dope) should be used sparingly on male threads only and be
approved for all gases.
Manual Shutoff Valve
Liquefied petroleum gas is heavier than air. All connections should be checked for leaks using a
soapy solution applied to gas connections. Leaking gas will settle in low lying areas such as
basements and trenches. Failure to comply with the precautions and instructions, can result in
death, serious bodily injury or burns, property damage or loss from fire or explosion, and/or
asphyxiation due to lack of adequate air supply or carbon monoxide poisoning.
GAS LEAK HAZARD
Floor Level
Figure 3 - Manual Shutoff Valve
Figure 4 - Pipe Union and Fittings
