Hydrotest Pressure
Hydrotest Pressure
(OP)
Is there a tolerance on the hydrotest pressure when testing to B31.3?
I am testing carbon steel pipe for the petroleum industry.
Also HDPE pipe is being tested>
Thanks
I am testing carbon steel pipe for the petroleum industry.
Also HDPE pipe is being tested>
Thanks





RE: Hydrotest Pressure
David
RE: Hydrotest Pressure
I've often seen it 90% of SMYS as a minimum & 110% as a maximum.
Greg Lamberson, BS, MBA
Consultant - Upstream Energy
Website: www.oil-gas-consulting.com
RE: Hydrotest Pressure
Where a wider ranging test comes in handy is when you must test a pipe segment that has a large elevation change. If temperatures are expected to change such that you would go outside your elevation range too much, it would be better to test on another day if it was possible to do so, since it might be very difficult to reach a stabilization point beforehand.
http://virtualpipeline.spaces.msn.com
RE: Hydrotest Pressure
ht
Also if black HDPE pipe is in an open ditch, the sun can really warm it up, easily over 100F. The temperature causes a "de-rating" of the piping & it will fail under much less pressure than expected.
Good luck - MJH
RE: Hydrotest Pressure
Cl302.2.4 e)& f) apply in that if you rely upon occassional loads derived from pressure then the hydrostatic test pressure should be at least that high.
Geoffrey D Stone FIMechE C.Eng;FIEAust CP Eng
www.waterhammer.bigblog.com.au