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Pressure testing a boiler

Boiler must be hydraulic pressure tested about 1.25 times the working pressure. Gag the safety valves and shut of the water gauges. Isolate and blank off parts which are not designed to withstand the pressure( attemperators or superheaters which are only designed to withstand differential pressure
between drum and superheater)fit the pump and required calibrated pressure gauges. Fill drum with water near the present metal temperature (never less than 7 degrees). keep the vents open until water comes through the vent. then pressurize slowly and check for leaks. if leaks are present, rectify and retest.
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