Is it mandatory to consider hydrotest pressure 1.5 times of design pressure for process piping? 1

[SmallInfo]

Greetings!
Can we perform hydrotest of process piping (not atm pipe) less than 1.5 times of design pressure? If yes, in which condition and does b31.3 allow us to do?
Thanks

 

[GBTorpenhow]

Yes, see §345.2.1(a).

 

[SmallInfo]

Thanks GBTorpenhow
but its saying "the test pressure may be reduced to the maximum pressure that will not exceed the lesser of the yield strength or 1.5 times a component rating at test temperature" this 1.5 times a component rating is confusing me, can you please elaborate this?

 

[GBTorpenhow]

An example: I am to test a GrB CS piping system with a design P/T of 740 psig @ 650°F. The required hydrotest pressure would be 1240 psig per 345.4.2(b). I have a component (valve, instrument, etc.) present in the piping system to be tested that happens to be only rated at 750 psig at test temperature, so I am allowed to reduce the hydrotest pressure to 750 x 1.5 = 1125 psig.

 

[SmallInfo]

GBTorpenhow
I can only say WOW! the way you explained with an example is out standing.
Thanks its clear now, pardon me if I come back again with any query. Thanks again

 

[Cobra17]

You can also test piping with a vessel, as a system and do it to the vessels hydrotest pressure per 345.4.3, with some conditions.