Hydrotest of GRE pipes
Hydrotest of GRE pipes
(OP)
Hi all,
I have received an Inspection Certificate prepared by a TPA company that shows a hydrostatic test (with a test pressure of 30 bar for a duration of 5 minutes) has been conducted on a series of GRE piping materials with PN 20.
Based on which standard are we allowed to apply a pressure 1.5 times greater than the maximum pressure that the pipe material can withstand?
How is it still a Non-destructive Test?
Any comments would be appreciated.
I have received an Inspection Certificate prepared by a TPA company that shows a hydrostatic test (with a test pressure of 30 bar for a duration of 5 minutes) has been conducted on a series of GRE piping materials with PN 20.
Based on which standard are we allowed to apply a pressure 1.5 times greater than the maximum pressure that the pipe material can withstand?
How is it still a Non-destructive Test?
Any comments would be appreciated.





RE: Hydrotest of GRE pipes
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Hydrotest of GRE pipes
RE: Hydrotest of GRE pipes
The idea is that the material is tested to just below the point where it would suffer any damage such as cracking or yielding, but higher than any pressure it would see in its operating life.
The actual test pressure varies according to materials and use and hence the code given by SJones will provide that pressure for GRE. Other materials may be higher or lower fraction of the maximim rated pressure or design pressure.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Hydrotest of GRE pipes
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.