gagging tool for boiler safety valve made in china

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IMO your question is more suitable for PSV forum http://www.eng-tips.com/threadminder.cfm?pid=1203 . Of course some of us in this forum have experiences in safety valve.

See some hint from some expert whom have done this http://www.eng-tips.com/viewthread.cfm?qid=180240 . Moral of the story, this is a risky job with some uncertainties, be cautious for operator to position themselves when performing this. If your safety valve is open loop, do not position any parts of someones" body in front or near the outlet

For gaging as well as adjusting it in relatively safe manner, Trevi-test is one way to do it. similar video by Tru-test https://www.youtube.com/watch?v=gAwS-tjbLeg

Be cautious that you or the commissioning personnel should correspond both safety valves" setting pressure vs the testing pressure. If its gagged (set the screw to prevent it from opening)at X Psi, then the testing pressure is not advisable to exceed 5% of X. this potentially bent the spindle. And if this happened, as per safety regulation the damage parts shall be renewed with UV stamped (read: original) manufacturer parts (if your safety valve manufacturer and your boiler are referring to ASME).

Test Gag is a bolt used for the spindle block of the pressure relief valve (PRV) to allow the PRV to be closed during the pressure test. The bolt should be tightened when the system has 80% of the pressure used. test (test pressure) to ensure that the PRV is closed at the test Pressure:

Before attempting to adjust the safety valves of any boiler,its essential to verify the accuracy of the boiler pressure gauge,safety valves must be set at a pressure not exceeding 3% above the approved working pressure each safety valve is adjusted independently.

You will hear a hissing sound, this is the floating condition of the valve and subsequently the valve will lift. if the valve lifts before the set pressure is achieved tighten the compression nut. if the valve fails to lift at the set pressure loosen the compression nut, maintain the boiler pressure constant while adjusting, reduce boiler pressure, remove gagging tool and fit to other valve for setting.

After both valves are set, remove the gagging tool and fire the boiler to maximum capacity. note full flow of waste steam from waste steam pipe. note pressure on gauge, the pressure should not exceed 10% of set pressure. after completion refit caps, cotter, locks and easing gear.

DEAR FRNDS, IF WE DO GAGING AT ANY PRESSURE IT IS WRONG. I HAVE RECENTLY GONE THROUGH A TRAINING PROGRAM ON SAFETY VALVE .IT RECOMMENDS THAT GAGING TO BE DONE AT 70% PRESSURE.

Never, ever gage a safety valve while under any pressure. Serious injury can occur. The safeties are gaged only if you are doing a hydro over the set pressures on the valves. This is only accomplished after major repairs. The NBIC recommends going to 80% of the lowest safety valve setting for a tightness hydro or after the completion of routine repairs.

I"m not sure precisely what the API has to do with boiler operation but whatever. You only gag a safety if you"r squeezing the vessel to 1 1/2 times the working pressure. This is only done after construction or major repair. The rest of the time you squeeze the boiler to working pressure and if you"r careful not to go over that you don"t need to gag the safety valves. You most certainly would never operate the boiler with gags on the safety valves.

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