Pneumatic Test 5

[St sh]

There is a Tower that has been make from SA-516 70 with diameter 5700 and length 15 m.(MAWP=12 bar)
I have a question about pneumatic test.according to ASME CODE UG-100 we can do pneumatic test in lieu of hydro static.
but we have never done pneumatic test at our shop.
Please help me if there are points about pneumatic test and its dangerous?!

 

[LittleInch]

Compositepro - I agree. The issue with even relatively small volumes of air and hence less energy is often the issue of a component failing and becoming a projectile or a mass connected to a tube and swinging around.

There have sadly been a number of fatalities associated with small screwed instrument connections coming loose and "shooting off" without warning, so that needs careful consideration also.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[itsmoked]

More likely that many ton tank would split somewhere and then rocket off in some direction causing a localized path of complete destruction. Imaging that thing rolling thru a few walls and everything between them. I could imaging it reaching further than 114m if rolling.

Keith Cress
kcress -

http://www.flaminsystems.com

 

[racookpe1978]

Was not the hot water tank blown up on Mythbusters blown higher vertically than 114 meters?

True, the explosive force is at best an example - but as a scary example to the head office - it is better than a more precise but less visible term.

 

[Compositepro]

Fear is not an engineering argument. Using it undermines your professionalism as an engineer.

 

[St sh]

Dear GD-2

Thanks for your comments.
Design pressure is 9 bar and temperature is 80C.
The service is MEDA.

 

[GD2]

What is MEDA? Before I redo my calc, I want to know whether the pneumatic test plan is still on the plate? If not, i certainly do not want to put more time on it. I will also need the greatest wall thickness of the element of the tower (most likely the bottom most element) to determine the test temperature. Do you know the MDMT for the tower? What will be your ambient temperature when you plan to do the test?

 

[St sh]

Dear GD-2
Sorry for delay to response.
MDMT : 5 C
THICKNESS:FROM BOTTOM TO TOP IS VARIOUS FROM 40 TO 22 mm.
Further to our investigation we ignore pneumatic test.

Best Regards .

 

[GD2]

Setareh sh,
You or your company had made a sensible decision by not going for a pneumatic test. What is the final decision you took for the sake of the team who responded to your query?

Ganga D. Deka, P. Eng
Canada

 

[MJCronin]

Setareh sh,

I am curious ....Does your CEO have an MBA degree ????

Just askin for a friend ....

http://www.safteng.net/index.php/fr...rophic-failure-during-pneumatic-pressure-test

MJCronin
Sr. Process Engineer