Test media for thermal relief valve
Test media for thermal relief valve
(OP)
Can we use nitrogen as test media for thermal relief valve (liquid service) ? One supplier informs that only water shall be used for testing. However, I understand that nitrogen can also be used for tighness test and pop test. Please comment.





RE: Test media for thermal relief valve
A few years ago I had a similar situation with a relief valve for use with lube oil... we had an N2 bottle and all the gear so ahead we went with the testing...the valves seemed to be completely out of spec (started to discharge at a significant lower pressure).
Went back to land, grrr!! (it was on an offshore rig) got a manual pump with oil similar to the actual working fluid and: lo and behold!!! the valves were right on the money.
HTH.
On the same token, when testing a valve that must be tight for H2 service (the smallest molecule of all), you cannot use air or N2, it will seem tight with those fluids but it may leak like hell with H2.
Bottom line: do what the supplier says.
HTH
Saludos.
a.
RE: Test media for thermal relief valve
The manufacturer of the valve should be able to assist you if you need to test the valve in how it is tested.
ANSI CLASS Maximum Seat Leakage Test Conditions
Class III 0.1% of rated valve capacity Air or water @ 50 - 125 F. 45 - 60 psig or Maximum operating differential pressure whichever is less
Class IV 0.01% of rated valve capacity Air or water @ 50 - 125 F. 45 - 60 psig or Maximum operating differential pressure whichever is less
Class VI 1" Port Diameter
0.15 ml per minute or 1 bubble per minute
Air or Nitrogen @ 50 - 125 F 50 psig or Maximum operating differential pressure whichever is less
RE: Test media for thermal relief valve
RE: Test media for thermal relief valve
RE: Test media for thermal relief valve
I heard that we can test both liquid and gas application with air according to DIN Standard. However, we must test the safety relief valve for liquid application with water according to API/ASME. Please comment about the difference.
RE: Test media for thermal relief valve