LP-Gas Serviceman’s Manual

Leak Testing the Installation
B. Gauge Adapter Method (High Pressure Testing Procedure)
Step 1. Inspect all connections and appliance valves to be sure
such connections are wrench tight and that all appliance valves are
closed including the pilot valves.
Step 2. Install 2962 high pressure test gauge adapter on the tank
service valve and connect the other end of the gauge adapter to the
pigtail and regulator inlet.
Step 3. Open container valve to allow the system to pressurize
while observing indicated pressure on 300 pound testing gauge.
Step 4. Close service valve tightly. Note pressure reading on the
pressure gauge, then slowly bleed gas between service valve and
gauge adapter, reduce pressure to 10 PSIG less than the original
reading on the gauge and retighten gauge adapter into service valve
or close bleeder port. Note reading on gauge.
If gauge reading remains constant for 3 minutes, it can be
assumed the system is leak tight. If the pressure reading drops,
it indicates a leak somewhere in the high or low pressure piping
system. NOTE: A pressure drop of 15 psig in 10 minutes time
indicates a leak as little as 10 BTU of gas per hour. Check joints
and other possible points of leakage with an approved combustible
gas detector, soap and water, or an equivalent nonflammable
solution. CAUTION: Since some leak test solutions, including
soap and water, may cause corrosion or stress cracking, the piping
should be rinsed with water after testing, unless it is determined
the leak test solution is noncorrosive. Never test with an open
flame. If there is an increase in pressure it indicates the container
valve is not shut off completely. Shut off container valve tightly
and repeat step 4.
Step 5. Disconnect the 2962 test gauge adapter from the service
shut off valve. Reconnect pigtail, tighten and test with soap and
water or an appropriate leak detector solution (refer to caution in
step 4., above).
Step 6. If required, proceed with manometer method steps 2
through 4. Never check for leaks with an open flame.
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