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NFPA code requires a leak check to be performed before any appliance or equipment is placed into operation or after an interruption of service. The leak check requirement applies to the entire vapor distribution system up to the outlets of the equipment shutoff valves. Many propane marketers, however, include the appliance connectors and the appliance gas controls as part of the leak check.
As opposed to a pressure test, per NFPA 54, pressure test is normally conducted with a minimum test pressure of 1-1/2 times above the normal operating pressure of the piping.
The type of testing instrument used in performing a leak check depends on the type of leak check being performed.
For a high pressure leak check, the testing instrument is placed after the first stage regulator and before the second stage regulator. This test usually uses a 0-30 psi pressure gauge.
Click here to preview CETP E-Learning Bobtail Delivery Operations to see how a high pressure gauge can be used to conduct a high pressure leak check.
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