A test to ensure air tightness of vessels such as Compressors, Refrigerant Pumps, Pressure vessels and etc, to prevent leakage of internal gas. Air tightness test is carried out after pressure resistance and strength test of the vessels.
Pressurize the inside of the equipment with non-flammable gas at a pressure higher than the nominal operating pressure and apply a foaming agent to the outside of the vessels to confirm that there are no leaks.