PSV Servicing/Testing Facilities
PSV Servicing/Testing Facilities
(OP)
There are PSV Test Stands being sold now which have a high pressure compressor feeding 1/2" tubing to the inlet of the PSV. These are being sold as certified for testing all sizes of PSV, via an adjustible clamp/flange assembly.
This is quite different than what I'm used to. I've always used a Test Bench with a large receiver so that there was enough volume to actually pop open all the PSV's up to the maximum set pressures and PSV inlet sizes as authorized in the organizations PSV QC Program.
Are these PSV Test Stands with pressure and without volume, acceptable for testing 'UV' stamped PSV's? Is it acceptable to just simmer a PSV when testing or is it mandatory to pop the PSV 100% open?
This is quite different than what I'm used to. I've always used a Test Bench with a large receiver so that there was enough volume to actually pop open all the PSV's up to the maximum set pressures and PSV inlet sizes as authorized in the organizations PSV QC Program.
Are these PSV Test Stands with pressure and without volume, acceptable for testing 'UV' stamped PSV's? Is it acceptable to just simmer a PSV when testing or is it mandatory to pop the PSV 100% open?





RE: PSV Servicing/Testing Facilities
Should be interesting to see a copy (in English) of the exact text you are referring to. What does the 'certification paper' for the test bench say, and what authority has issued the certification? Do the text just mention 'all' or is it referring or giving exact references to certification and test standards allowed to be performed in this bench, with references to sizes, types and pressures for valves?
I think you will find your answer by cross referring with the exact test prescriptions/regulations you are wanting to certify to. This will decide, not what is (wrongly or rightly) mentioned in the test bench papers.
RE: PSV Servicing/Testing Facilities
Attached is a sample of the bench and a close up of where the PSV's are clamped to the bench flange. You can see there is only a 1/2" tube feeding to the inlet of the PSV. How can thie meet the requirements of API 576 and how can this possibly pop open a 2" and larger PSV?
RE: PSV Servicing/Testing Facilities
To clarify, and I think it is as simple as that: If the test bench is not able to correctly do all operations necessary to do what is required by the described test procedures given for testing, it is not suitable or allowed for this testing. If the supplier can not guarantee what is necessary for your test, you are on your own.
RE: PSV Servicing/Testing Facilities
RE: PSV Servicing/Testing Facilities
I am a Scandinavian citizen without the detailed US knowledge you need. Your question would stand a better chance of proper answer rephrased and posted on the safety valve forum. Good Luck!