Form 43539178
Oct 2019
10
7a.
INSTRUCTIONS FOR TESTING FOR GAS LEAKS AND PROPER GAS
PRESSURE
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WARNING: DO NOT OMIT THE SE TE STS
!
TESTING THE INSTALLATION FOR GAS LEAKS:
1. Inspect all connections and appliance valves to be sure connections are wrench-tight and
that all appliance valves are closed, including the pilot valves.
2. Connect a low-pressure test set to the low pressure piping system just upstream of the
appliance regulators and control.
3. Fully open the LP gas container valve slowly to pressurise the piping system. Once the
system is pressurised and stabilised, close the container valve tightly.
4. Observe the indicated pressure on the low-pressure test set gauge. This reading should be
approximately equivalent to the set delivery pressure of the final stage regulator. Now,
slowly open one burner valve or pilot valve on the appliance to vent off just enough gas to
reduce the pressure on the test gauge by 2.5 mbar, then close the burner or pilot valve.
If the pressure remains unchanged on the gauge for at least 10 minutes, the system can be
assumed leak-tight. If a drop in pressure does occur, it indicates a leak in the system.
If the pressure drop occurs, check the joints, connectors, and other possible points of leakage
with an approved, high quality leak detection solution. NEVER USE A MATCH OR OPEN FLAME TO
CHECK FOR LEAKS. Once a leak has been located and repaired, repeat Steps 3 and 4 above. If
there is an increase in pressure, it indicates that the LP gas container valve is not shut off tightly.
Shut off the valve tightly and repeat Step 4 above.
NOTE: Do not expose final stage piping to excessive heat or direct sunshine during the leak
test. Pressure build-up in the line due to heat may compensate for pressure loss due to leaks.
This will prevent the gauge reading from indicating system leaks.
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WARNING: Gas Pressure Testing is to be performed only by qualified personnel.
CHECK GAS INLET (SUPPLY) PRESSURE:
1.
Be sure the valve is in the “OFF” position before removing the pressure tap plug at the valve.
Connect a low-pressure test set (water manometer or dry gauge) to the 1/8” NPT Inlet
Pressure Tap connection. (Refer to Figure 6 for each control valve type.) Turn the valve to
the “ON” position. DO NOT EXCEED THE PRESSURES SHOWN IN THE GAS PRESSURE TABLE.
2.
Turn the valve back to the “OFF” position before removing the test set and replacing the plug.
Repeat the gas leak test at the plug
FIGURE 6
Control No.2 / No.4