online testing of boiler safety valves . , trevi test of drum & ms safety valves: online testing ( lifting/set pressure setting , without actual full floating ) of drum & main steam ( m . s ) line safety valves ( i . e . 3 nos per unit ) of our boilers by trevitest / equivalent test method . you will be offered 3 nos of safety valves on each occasion ( usually after annual overhauling or in case of short shut down for boiler licenseextension purpose ) for testing . time is the essence in this testing work , since the boiler will be kept running on oil firing to maintain a base line pressure of about 85 to 90 % of lowestset pressure value . the total time period for testing for 3 safety valves should preferably be about 1 hour to 1 . 5 hour . make :all valves are of bhel make , m/s dresser design ( 1700 series ) . , trevi test of re-heater safety valves: online testing ( lifting/set pressure setting without actual full floating ) of crh & hrh steam line safety valves of our boilers by trevitest /equivalent method . you will be offered 3 nos of safety valves for test per visit . line pressure for all these valves ( in full load condition ) is about 30 kg/ cm2 . make :all valves are of bhel make , m/s dresser design ( 1700 series ) . , trevi test of turbine side safety valves: online testing ( lifting/set pressure setting without actual full floating ) of turbine side low pr . steam line safety valves by trevitest / equivalentmethod . you will be offered minimum 3 nos of safety valves for test per visit .