How is an LP gas system tested after replacement of gas lines or appliances?
The appropriate method for testing an RV LPG system is to measure pressure with either a calibrated PSI gauge or WCI wet stick. The measurement should be taken at an appliance (stove burner) with approximately 50 % of the total coach volume being used, such as a furnace or water heater on at the same time. Static pressure should be no higher than 15 WCI (water column inches), which is about 0.2 PSI. Dynamic pressure should be no lower than 11 Inches of Water (WCI), about 0.15 PSI. A leak test of the entire system is best done after checking the pressure. Shut off the tank valves. Using one of the appliance valves, lower the pressure to approximately 8 WCI. Allow the coach to sit for 15 minutes or so. No change in pressure is a good system. To track down the leak, use a leak detect solution along the lines and fitting to find the minute gas bubbles.
