Pneumatic testing (Cryogenic)

Question

Pneumatic testing (Cryogenic)

GemmellG (Materials)

(OP)

15 Dec 17 15:54

Currently working on a LNG piping installation the pipe service is Cryogenic design MDMT is -321F. Materials are SA312-TP316L. Client has requested the completed lines be Pneumatic tested due to moisture concerns. Code is ASME B31.3. Can anyone recommend a minimum metal & test medium (Nitrogen) test temperature.

mk3223 (Mechanical) · Answer 1 · 2017-12-29 00:11:08

My experience of the piping pneumatic test was to use the test fluid and metal temperature around 40F to 120F, which is not less than 30F above the pipe MDMT.

metengr (Materials) · Answer 2 · 2017-12-29 03:35:34

All of the information is present in 345.5 Pneumatic Leak Test.

DekDee (Petroleum) · Answer 3 · 2017-12-29 13:11:57

Again, as I have noted previously, there are too many lazy and/or unqualified people on this forum wanting someone else to do their work.
Are you seriously going to pneumatically test pipework based on what someone has told you on the internet ?

Before you pneumatically test anything you should be submitting a testing procedure to your client for review and acceptance.
Look a bit stupid if you put under references - www.eng-tips.com ?

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Pneumatic testing (Cryogenic)