A relationship between Hydrostatic test pressure and test temperature 1

[Dawoon]

I want to conduct hydrostatic test for Austenitic S.S piping.

Test fluid is water without Cl ion (or minimize Cl ion).

But there's a one problem I worry about.

There's possibility that water could condensate whiel conducting test. And it's possible that Cl SCC could occur because the piping is Austenitic S.S. (Cause I'm not sure that Cl is wholey eliminated from water.)

So I'm looking for the temperature condition while conducting hydrostatic test for Austenitic S.S piping.

I only found an code for temperature condition to prevent brittle fracture.

But I didn't find any comments for temperature condition to prevent Cl condensation or something like this.

So I neeed your help.

Is there anyone who already experienced about this problem?

I'll wait your kind answer. Thx~

 

[Dawoon]

P.S 1 : Pipings for refinery.

P.S 2 : There'a possibiliyt that test fluid is not raw water. Anyway other test fluid has Cl ion, either.

 

[gr2vessels]

1. Don't worry, the water will not condensate any further than its condition at normal testing temperature.
2. The normal hydrotesting temperature is the ambient, except for special cases in freezing ambient temperatures. Normally the water should have less than 25 ppm chlorides content. Try to not exceed 60 deg C for any small content of Cl in the testing water.
3. Brittle fracture is associated with freezing and criogenic temperatures, however the SS is not affected until say -100 deg C.
4. The chlorides which could affect the Austenitic SS are salts, so the Cl condensation is not an issue.
5. Try to download from google the definition of the hydrostatic test for piping (I guess you don't have access to any of pressure piping codes...)

P.S 1 : Is there any other person with some vague inspection authority in this refinery to help you out? Most of the refineries in the world have their own hydrotesting specifications, try to locate one before you start filling in the pipe with (I hope) water. Try to stay away from any 'testing fluid with chlorides'.
P.S 2: If desperate, you can use (for normal hydrotest conditions) the sea water, provided is adequately treated and you have an approved plan of how to dispose of it after test. Otherwise, use tap water and ask someone to test the Chlorides content of it before use.