Gas PipingQuestion 95 of 120
Which practice is correct when pressure testing a fuel gas piping system?
a.Use oxygen so the test medium is dry and clean
b.Leave appliance regulators connected so they are tested with the piping
c.Use air, nitrogen or another inert gas and isolate appliances and regulators from the test
d.Test with the fuel gas itself and check joints with an open flame
Explanation
The test medium must be air, nitrogen, carbon dioxide or another inert gas, and any equipment or regulator that cannot withstand the test pressure must be disconnected or isolated with a valve. Oxygen is prohibited because it reacts violently with pipe oils, appliance regulators are damaged by test pressures well above their rating, and locating leaks with a flame is never acceptable.
Law Reference: IFGC §406.4Practice all 120 questions free — no signup required.
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