Pneumatic Test Pressure

Is that after a hydraulic test to a higher pressure?

_{[The original poster's question might make the more sensitive reader nervous, because 5psi of air is very dangerous if it is propelling a large manhole cover in the direction of an unsuspecting Engineer....]}

Common sense.....

Please specify which company standards that you seem to recall.

Never heard of the requirements that you listed. However it is common to test at 1.5 the system/equipment rating.

hi, you have listed that the pneumatic test shall be carried out of 1.1 times design pressure. This can be done in everywhere but regarding 700kpa i haven't ever come across. you have mentioned that whichever is minimum it can be done. So i think due to inherent dangers associated with pneumatic test the pressure of the air/gas should be minimum. Thats why that company might be used of 700kpa.

Tend to agree with Natarajan.

ASME-section VIII - Pressure vessels uses 1.1 times MAWP (or design pressure I think) for pneumatic testing. This is a requirement if used in place of hydro test.

It seems to me that the 100psi limit is an in-company rule for "leak testing", not pressure testing.

Personally I avoid pneumatic pressure testing if at all possible.

See: www.lngpedia.com/blast-kills-worker-at-shanghai-lng-project/

I think that this explains everything you need to know