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When pneumatic testing goes wrong


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#1 Master slacker

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Posted 27 May 2011 - 12:08 PM

If you pneumatically test any pressure containing equipment, make sure you know the dangers and have an adequate plan in place to mitigate those dangers.

[attachment=4428:Wepp_2.pdf]

#2 Ble_PE

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Posted 27 May 2011 - 12:12 PM

So what are we looking at here? Looks similar to a gas turbine, but I'm not sure.

#3 Master slacker

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Posted 27 May 2011 - 12:18 PM

I wish I knew, but it doesn't appear to be a gas turbine.

#4 cableguy

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Posted 27 May 2011 - 01:05 PM

Heh, a coworker was talking to me this week about building a bolt flanged pressurized pipe at his house for a project.

I had to send him a copy of this. smile.gif Boom!

Looks like it failed above the weld. Weird spot for a failure. The pipe looks like cast metal, which can crack if not welded properly. Or maybe it just had a crack there to begin with.

#5 Master slacker

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Posted 27 May 2011 - 01:08 PM

Latest update from the pipeline (no pun intended):

This failure happened last weekend. A GE compressor package was under nitrogen pressure test. You can see the pipe had a brittle fracture failure. I have no other details at this time. This is another illustration of the potential hazards of pneumatic testing. This is for the expansion of the West-East Gas Pipeline project for PetroChina. It is China's longest natural gas pipeline at 2500 miles (4000 km).


#6 MagicCityDawg

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Posted 27 May 2011 - 01:22 PM

QUOTE (Master slacker @ May 27 2011, 08:08 AM) <{POST_SNAPBACK}>
This failure happened last weekend.


I thought China was 13 hours ahead of us here in the central time zone, not two weeks behind.

#7 Supe

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Posted 27 May 2011 - 02:51 PM

And that, ladies and gentlemen, is why you buy some blinds and hydro the sucker.

#8 momech

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Posted 28 May 2011 - 04:21 AM

Looks like a giant weldneck flange failure. Doesn't look to me like the weld had anything to do with the failure. I wonder what the test pressure was.

#9 Coastal Engineer

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Posted 11 June 2011 - 08:09 PM

Just say no to pneumatic testing.




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