Hydraulic pressure test. Pressurization speed 5 bar/s 2

[raton]

Hi there.
I am new here and this is my first post.
I have received a pressure test procedure and the pressurization and depressurization speed are 5 bar/s and 10 bar/s.
I am not sure if these values come from any standard or are the good engineering practices for pressure test speed.
Could you please help me?

Thank you very much
Jaime (Raton)

 

[Hetairoi]

Hello everyone,

I'm having the same issues... and despite your guidelines are the right ones, as Jaime says, I am not able to find a code that give us a justification


Thanks again in advance

 

[unclesyd]

Look at the Autofrettage section on the page linked below.

This type equipment when used for testing small volume valves will have a very steep pressure rise when using an air powered pump or intensifier.
We tested one of our valves to 6750 psig and as I recall two strokes of the pump put us above 5000 psig. The approach to 6750 psig required a little finesse by the operator as the compressibility of water started to play a role. We were reasonably safe as these valves were designed for a little over 10,000 psig for H2, NH3, and an organic service.

You might give Calder a call to ask about testing your valves and see what they say. Calder is one of several manufacturers of test equipment.

http://www.caldertesters.com/testing_services.php

We had positive displacement pumps to achieve the 6750 psig pressure that used ball check valves. The inlet valve went fro 450 psig to 6750 at 33 times per minute.

 

[PNachtwey]

snip
Same momentum, about the same total force, much longer duration. Duration really matters.

The example Irrelevant.

Same thing happens with pressurisation/depressurization. Going from 0 to 315 bar in 32 seconds is a really good way to turn a fabrication into scrap metal.

Non-sense. What to you think presses do? Pressures will increase that amount if low fractions of a second.

10 bar/second is slow.

I bet this guy can can make a test system for you.

http://forums.hydraulicspneumatics....=8621030121&m=907101415&r=244101235#244101235

He just got his test system running and the first graph show 7 bar/s. I bet he can increase the pressure faster if asked.

I know have customers that change pressures in their test system must faster than 10 bar/s.





Peter Nachtwey
Delta Computer Systems

http://www.deltamotion.com

 

[Hetairoi]

Thanks all for the examples.... however, I'm still over the same doubt, no reference code!!!

I have asked for that at my office, friends, here... but it seems that there is no code that can give you a way to justify calculations.

Thanks again!!