Isolate the test equipment from other systems with a spade or a blind.
+ Make sure all required piping stress relief, weld examinations, and welding documentation have been completed and acceptable.
+ Install a calibrated test pressure gauge
+ Install sized and calibrated relief valves e.g. a liquid relief valve for hydrotest set to 1.33 times the test pressure or a pressure relief device for pneumatic test set to the test pressure plus the lesser of 50 psi or 10% of the test pressure
+ Block off the area and avoid irrelevant personnel’s access to the test area
+ Remove or block off all instruments and safety valves so that they will not be exposed to the test pressure.
+ Always check all test equipment and accessories (e.g. test pump, flexible hose, valves) and that all test connections are tight.
+ Check correct vessel and flange installation including torqued flanges with no missing bolts or gaskets
+ All joints, including welds and flanges, to be tested should be left uninsulated and exposed for inspection during the test.
+ Install a high-point vent to eliminate trapped air or depressurize during pneumatic test and a low-point drain to allow proper filling and draining during hydrotest
+ For hydrotest, make sure that the equipment, foundation, and supports have been designed for full-liquid condition