What pressure test methods are used for installed propane tanks?

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Testing Methods Hydrostatic testing is a common method used to test underground propane tanks. This involves filling the tank with water to a level that exceeds the maximum working pressure, typically 1.5 times the tank’s rated pressure. The tank is then pressurized and inspected for leaks. A typical hydrostatic test involves filling the tank with water to a pressure of 250-300 psi, which is equivalent to 1.5 times the tank’s rated pressure of 150-200 psi.
Visual Inspection Visual inspection is a crucial part of the testing process. Inspectors use specialized equipment, such as cameras and lights, to examine the tank’s interior and exterior for signs of corrosion, damage, or other defects. They check for any signs of water ingress, which can indicate a leak or other problem. The inspector also checks the tank’s protective coating, such as a cathodic protection system, to ensure it is functioning properly.
Pneumatic Testing Pneumatic testing, also known as pneumatic leak testing, involves filling the tank with air and applying a pressure to test for leaks. This method is often used in conjunction with hydrostatic testing or as an alternative to hydrostatic testing. The tank is pressurized to a level of 150-200 psi, which is equivalent to the tank’s rated pressure, and inspected for any signs of leaks. This method is less expensive than hydrostatic testing but provides less accurate results.