NDT performed after or before Hydrotest test

[mrmalcolm]

Dear colleagues,
Any code mentioned Non-destructive testing should be performed after or before the hydrostatic test?
If non-destructive testing is performed after the hydrostatic test, is it possible that the hydrostatic test could cause minor imperfection to expand into major defects?
If non-destructive testing is performed before the hydrostatic test, could the pressure of the hydrostatic test cause the pressure vessel to explode?
Thank you.

 

[mfgenggear]

“To in sure weld integrity”. : INCORRECT
Pressure test is to check a pressure vessel integrity, not only the welds
Hydrostatic pressure test for piping is different for pressure vessels.

I think you lost it, better take a chill pill

 

[mfgenggear]

“To in sure weld integrity”. : INCORRECT
Pressure test is to check a pressure vessel integrity, not only the welds
Hydrostatic pressure test for piping is different for pressure vessels.

Nitrogen leak test

 

[mfgenggear]

After Cleaning fittingtack welding and welding atlas centaur oxygen and hydrozine fuel lines, a pressure test is conducted with helium. The welds do leak but it is very very light. Which then has to be repaired or reworked.

 

[r6155]

mfgenggear​

Increasingly confused.

 

[mfgenggear]

mfgenggear​

Increasingly confused.

What ever you need to work on your people skills.

 

[Christine74]

I have seen clients specify that RT, PT, and/or WFMT examination of welds be performed AFTER hydrotest for certain applications. Implicit in this requirement is the assumption that hydrotesting could potentially damage welds but I've only ever heard of this happening with austenitic stainless steel vessels that were hydrotested using water relatively high in chlorides.


-Christine

 

[mfgenggear]

I have seen clients specify that RT, PT, and/or WFMT examination of welds be performed AFTER hydrotest for certain applications. Implicit in this requirement is the assumption that hydrotesting could potentially damage welds but I've only ever heard of this happening with austenitic stainless steel vessels that were hydrotested using water relatively high in chlorides.


-Christine

Our shop had di water. Some of tubing and pipes
Did not allow city water. To many contaminants.

 

[DekDee]

What ever you need to work on your people skills.

I have blocked him - the forum is much more enjoyable for me now.

 

[DekDee]

I have seen clients specify that RT, PT, and/or WFMT examination of welds be performed AFTER hydrotest for certain applications. Implicit in this requirement is the assumption that hydrotesting could potentially damage welds but I've only ever heard of this happening with austenitic stainless steel vessels that were hydrotested using water relatively high in chlorides.


-Christine

Hi Christine,
Another Client without a clue.
I had similar requirements on my last project with specifications that were about 30 years old from a major US O&G company.
Did not take long to get the requirements waived with a bit of information provided.
Just out of personal interest - how would damage caused by high chlorides be identified by RT ?