Why is the LPG system pressure gage installed on the cylinder (high-pressure) side of the pressure regulator and not on the appliance (low-pressure) side?
A. The gage is installed in the system to provide a quick and easy way to test the LPG supply system for leakage. With the gage in the high-pressure section of the supply system, a leak anywhere between the tank valve and appliance valves will be detectable more readily than if the gage were in the low-pressure section. A supply system leak test should be conducted every time the cylinder supply valve is opened for use, and after any event that might effect the integrity of the system, such as grounding, fire, or collision. The leak test is conducted by pressurizing and then isolating the supply system. With the supply system pressurized, the pressure gage reading should remain constant for at least three minutes. Any drop in pressure would indicate a leak somewhere in the supply system. The requirements for the gage and leak test are given in ABYC A-1.5.1, A-1.5.2, and A-1.10.3.1.
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