Each pipe assembly and fitting is subjected to a hydrostatic pressure test and an electrostatic test. 

1) Hydrostatic Test 

All class 150 pipe assemblies and fittings are subjected to a 29 bar (425 psig) and for class 300, to 46.5 bar (675 psig) hydrostatic pressure test at room temperature using clean water. The procedure and duration of this test is to be carried out as laid down in ASTM F 1545. The pressure gauge and vent holes in the pipe and fitting housing are to be observed through out the pressure test for any evidence of leakage which is a cause for rejection. 

2) Electrostatic Test  

The liner of all complete assemblies is subjected to 25 KV non-destructive electrostatic test which is carried out to detect any defects like pin holes, porosity, cracks etc.in the liner. A visible and audible spark occures at the probe section when electrical contact is made with the metal housing because of a defect in the liner. This shall be a cause for rejection.