Pressure Test of Relief Valve Body

Hello Aurel Mares,

The safety relief valves can be calibrated by take it out of the system or vessel. And then install it to test pressure (usually water) equipment, increasing pressure to test value and you can calibrare your relief valve at this pressure.

But here I recommand that, you should take it to fully authorized place for "calibrating safety relief valve".

Do you know the way how to separate this different internal spaces of his mentioned type of valve????

I don't know realy why he want to test the body of safety valve. And I think that action is not need.

Sometimes, it is necessary to to check the body of safety valve by hydrostatic or pneumatic test, especially after any repair, corrosion, and/or erosion of the body itself.

To hydro test both sides, you would need to gag the valve in the closed position. and test inlet side. No need to gag for testing the outlet "shell" side. I can help you with this, and also repairing and testing to NBIC and ASME codes. Contact 757-613-9213

Here is a contact to help you. jkessinger@teamindustrialservices.com

Why do you need to re-test the valve body? It was tested by the manufacturer, and unless you modified it-that still holds.

Pressure test of valve body applies to testing of ball valve. Pressure relief valve is set to pop on certain pressure. If you vant to test ball valve, please confirm. I would tell you how to do it?

Dear Abdul Wasay

Thanks a lot fot your support in above matter solving. Are two different things:

- first, calibration the relief safety valve for the designed set point. Ussualy is done in work shop by the authorized inpsectors. This point is very clear.

- second, our regulations are specificated to perform a pressure test for normal valves body ( mean gate valve, globe valve, ball valve, etc. ) after work shop maintenance ( reparing, welding ). Same thing is required also for relief valve body. My question is how to conduct this pressure test if the inlet and outlet relief valve flanges have different pressure rate. How to split internal space of relief valve body?

Hope this help to cllarify the question

Best regards

Aurel

Please mention pressure ratings of inlet and outlet flange. Is it threaded at inlet and outlet?. For body testing you have to do overhualing of pressure relief valve to pull the spring out. Seal one end with threaded cap or blind flange with extension to install pressure guage. Use manual pump. Pressurise valve to the recommended press at open-air-drain end class that is it would be tested according to the lowes class flange/threaded end.

Dear Aurel Mares,

It is very easy, you just conduct the inlet and out let of safety relief valve and then perform hydro-pressure test.

performing hydro-pressure test is very easy, however the question here is How to split internal space of relief valve body? Do you understand the question?????

I think what he is talking about is that allot of times the outlet flange will be a lower rating than the inlet flange. example 300 pd. flange on inlet and 150 pd. flange on outlet. if the valve was set to pop off at 160 lbs and he had a blind on the outlet then would he be over-pressuring this flange? I would like to mention that flange ratings are meant to be at certain temp. if you are using ambient temp. water then the 150 lb. side would be rated for more than 150 lbs. pressure. there are charts that show the pd rating as related to temp. on the net.

pipewelder

I don't have my ASTM books handy but if I remember correctly the YIELD strength of flanges and valve bodies is at least >4 X the maximum operating value. So you needn't worry about damaging the valve when testing for compliance within the specified operating pressures.