Piping Hydrodynamic Test 4

[McDermott1711]

Why piping codes (such as ASME B31.3) deal only with "Hydrostatic Test"? Isn't it possible to have some requirements for dynamic aspect of piping test before its operation (e.g. piping connected to the pumps)?

Nothing is more fairly distributed than common sense: no one thinks he needs more of it than he already has. Rene Descartes

 

[1503-44]

"Maximum allowable stress/pressure" limits pressure from every possible condition.
It may not be feasible to test for each and every condition for a number of reasons.


A black swan to a turkey is a white swan to the butcher ... and to Boeing.

 

[mk3223]

IMO, the hydro test of the piping system is to take care of the design per process conditions, such s internal or external pressures. The dynamic conditions, such as wind, earthquake, impact, flow surge, etc., can be taken care with the CFD and piping and support design.

 

[MJCronin]

McDermott

It was always my understanding of the scope of ASME B31.1/B31.3 that once the system was hydrotested and certified it was turned over to the owner. The work of the design engineer and constructor was officially complete and these codes no longer apply. The piping system was now ready to operate.

The owner could then perform whatever operational testing, including dynamic or vibration test he desired ....

Not exactly sure what you mean by "to have some requirements for dynamic aspect of piping test before its operation (e.g. piping connected to the pumps)"

It is worthwhile to note that the ASME organization provides guidelines to monitor/evaluate vibration of Nuclear Power Plant piping systems "ASME Operating and Maintenance OM-3 “Vibration Testing of Piping Systems”,

No similar document exists for B31.1/31.3 systems ....... as far as I know

MJCronin
Sr. Process Engineer

 

[GD2]

I think it will be a good idea to introduce dynamic hydro testing on piping system based on pipe diameter, fluid velocity, type of valve installed (quick closing slam type check valve), probability of surge/water hammer(example: condensate not drained before charging a long steam line) and type of fluid handled(corrosive, toxic, lethal)
In fact, the piping codes allows room to exceed Yield Stress for occasional loads but putting in place for dynamic load testing for critical applications can actually test the system for integrity, in the event dynamic events occur.

GDD
Canada

 

[MJCronin]

What does ".. some requirements for dynamic aspect of piping test before its operation?" mean ?... in english ???

I do not understand ...

Are you talking about some kind of dynamic laoding case included in the stress evaluation of the piping ?

This is commonly done, has been done for decades and ASME B31.1 Appendix II includes a methodology for relief devices

.... or are you talking about something else ?

Can you give an example ?....... or have you already dropped interest in this thread ?

MJCronin
Sr. Process Engineer