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AIR LEAK TEST USES COMPRESSED AIR TO CHECK FOR LEAKS, USUALLY WITH SOAP WATER ON THE JOINTS (IF BUBBLES ARE THERE THEN THERE IS LEAK)
IF THE FLUID USED TO PRESSURISE A SYSTEM IS GAS USUALLY AIR OR INTERT GAS IT IS CALLED PNEUMATIC TEST. A PNEUMATIC TEST ISS HIGHLY DANGEROUS THAN HYDROTEST DUE TO HIGHER ENERGY CONTENT OF COMPRESSED GAS AND THIS TYPE OF TEST IS LIMITED TO LOWER PRESSURES SMALLER SYSTEMS.
