1.1 The water used for the pressure test shall be clean domestic water ，for containers with complex structures or distillation towers, plate fin heat exchangers, condensing evaporators, adsorbers, filters, etc., which should not be used as a medium, the air pressure test is available.
1.2 Gas tightness test for dry oil-free clean air or nitrogen.
Test pressure categories: strength air pressure test, test water pressure test, gas tightness test
Pressure vessel
3.1 Level pressure gauge test nitrogen seal pressure.
3.2 multi-channel vessel test sealing nitrogen in doubt or no sealing nitrogen must be pressure test to verify whether there is internal leakage.
3.3 Oxygen is strictly forbidden to be used as test pressure gas
Valve
4.1 Where the need for on-site degreasing, disassembly and inspection of the valve before installation shall be a separate gas tightness test.
4.2 The safety is only tested by jumping. After reaching the requirements can be sealed, where the safety valve before the shut-off valve ，the valve must be kept fully open and sealed.
4.3 Pneumatic film control valves need to make the following checks before installation: leakage check, positioner action test，packing letter, flange sealing surface for leakage inspection.
Dear Air Separation manufactures small air separation unit that meets customer requirements and is pressure tested and gas tight tested.
