Why NOT to pneumatic test
Why NOT to pneumatic test
(OP)
There's an email going around now with pictures of the aftermath of this incident:
http://ww w.shanghai daily.com/ sp/article /2009/2009 02/2009020 7/article_ 390150.htm
Here's your key bullet:
The explosion occurred during a pressure test of the equipment, according to the city government media office. Workers were pumping air into a gasifier when some 500 meters of the piping network burst into fragments, buckling cement crossbeams.
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Looking at the pictures, this was clearly high pressure rated pipe, so I've no doubt the test pressure was quite high and the stored energy somewhere north of enormous.
I cropped one of the images out of the PDF file and attached it to this post. If you get to see the full file, definitely check it out.
To be certain, pneumatic testing has it's place. But, the large amounts of stored energy involved must be respected.
http://ww
Here's your key bullet:
The explosion occurred during a pressure test of the equipment, according to the city government media office. Workers were pumping air into a gasifier when some 500 meters of the piping network burst into fragments, buckling cement crossbeams.
****
Looking at the pictures, this was clearly high pressure rated pipe, so I've no doubt the test pressure was quite high and the stored energy somewhere north of enormous.
I cropped one of the images out of the PDF file and attached it to this post. If you get to see the full file, definitely check it out.
To be certain, pneumatic testing has it's place. But, the large amounts of stored energy involved must be respected.
Edward L. Klein
Pipe Stress Engineer
Houston, Texas
"All the world is a Spring"
All opinions expressed here are my own and not my company's.





RE: Why NOT to pneumatic test
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"Pumping accounts for 20% of the world's energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies) http://virtualpipeline.spaces.live.com/
RE: Why NOT to pneumatic test
Any test is risky if there is not a competent test procedure or if the test procedure is not followed. I think I'll wait a bit on this one before changing behaviour.
David
RE: Why NOT to pneumatic test
http:
http://ww
RE: Why NOT to pneumatic test
Mike Halloran
Pembroke Pines, FL, USA
RE: Why NOT to pneumatic test
The blast happened at pneumatic testing a 500m length 36" natural gas pipe line. The testing pressure is 15.6Mpa. When the pressure reaches 12.3Mpa, a flange at the battery limit broke from the root of the hub, 3-4cm from the circ weld seam. The flange itself flied away 100m.The released air swing the pipe and totaled the gasifier and surrounding piping. The fracture is clear-cut. It is up to further investigation to find out the cause.
--It boils down to simple math--
RE: Why NOT to pneumatic test
KENAT,
Have you reminded yourself of FAQ731-376: Eng-Tips.com Forum Policies recently, or taken a look at posting policies: http://eng-tips.com/market.cfm?
RE: Why NOT to pneumatic test
RE: Why NOT to pneumatic test
Charlie
www.facsco.com
RE: Why NOT to pneumatic test
The test was a sucess, it found the defect in the piping.
I had 6 failures on some jacketed SS piping spools that required the spools to be broken down and the core pipe replaced. This took a lot of time and money but in the end I got an Attaboy because I insisted that all the spools be tested after being received from the fabricator who had graphited the shop test reports.
RE: Why NOT to pneumatic test
mainly because corruption from the design to the purchase ,
every step...
many famous multinational company just know the market of china ,and used to it ,enjoy it as he want to survival in this fields :)