pressure vessel cert requirement 2

[kriskincaid]

Hello, I just found this forum and this seems like a very informative site!

I have a question concerning testing and certification requirements for a pressure vessel. I am designing a testing rig to pressure test vessels before placing them back in service. The test rig is to be made of a 2" diameter by 12" long piece of stainless pipe with four 3/4" air connection fittings welded to the 2" pipe. This setup will be regulated to 30psi, never any higher. Very simple design to do a simple job.

I need to know what testing and certifications this test rig would need to undergo? Are there any rules for this?

Thanks for the info.

 

[metengr]

Based on the information you have provided in your post, it looks to me that the actual "test rig" for administering the pneumatic test to the pressure vessel requires no (or is exempt from) certification other than test gauges used to verify air pressure are calibrated to a traceable and recognized standard. I would use ASME Section VIII, Div 1 for all design, material and welding requirements for fabrication of the test rig.

 

[kriskincaid]

Thank you for the help. After thinking on it more, my test rig may be more accurately referred to as an air manifold. I'm not sure if this changes any testing requirements.Thanks again.

 

[VeryPicky]

Please do yourself a favour for the sake of safety. Consider installation of a tamper proof pressure relieve device on your air manifold.
Also, I don't know your local regs: that manifold may be considered a fitting (or, maybe, a pressure vessel even) that would require additional certification of compliance;.
Be very carefull about the "Very simple design to do a simple job." It might be just a bit more complicated than you think. I saw people in the field being hurt by those small things.

Good luck.

Putting Human Factor Back in Engineering

 

[GenB]

just make iit with good eng incl welding practice, and put it in service,
calculate it for the required pressure and temp,
no cert is neede,
ask your AI
geb

 

[ndeguy]

Hi kriskincaid

It is indeed a very informative site - it makes me realise how narrow and specialised is my engineering knowledge - there are so many posters here who have really given me an insight in to different fields.

On your topic, I recall a thread here about the safety advantages of hydrotest over pneumatic test. You mention air connection fittings in your OP. Have you ruled out the possibility of hydrotest? If you run a search here you will find a lot of useful information and warnings!

Cheers!



Nigel Armstrong
Karachaganak Petroleum
Kazakhstan