Hydotest Prior to NDE
Hydotest Prior to NDE
(OP)
Hi,
Anyone got experience doing hydrotest prior to NDE? Was informed this is violation of ASME B31.3.
In order to expedite the project, we plan to do hydrotest prior to NDE on selected services and pipe class.
Thanks
ppm
Anyone got experience doing hydrotest prior to NDE? Was informed this is violation of ASME B31.3.
In order to expedite the project, we plan to do hydrotest prior to NDE on selected services and pipe class.
Thanks
ppm





RE: Hydotest Prior to NDE
its a FLAGRANT violation.
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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: Hydotest Prior to NDE
RE: Hydotest Prior to NDE
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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: Hydotest Prior to NDE
RE: Hydotest Prior to NDE
RE: Hydotest Prior to NDE
Remember that a 10% rate is a spot check and, if you happened to find 1 bad one, that 10% would be increased, so that increased percentage would have to come before hydrotest too.
How do you think you're going to do 10% after hydrotest anyway?
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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: Hydotest Prior to NDE
(Not many of "mine" of course! - well, the ones that my crews actually so - but over time you will lose a certain number of welds. So, what are going to do when (not if, but when) a weld or joint fails during the hydro test and you break parts of steel off into somebody's head, neck, or torso?)
RE: Hydotest Prior to NDE
RE: Hydotest Prior to NDE
The only escape clause I know of is, if you are NOT doing any welding, brazing on any joints in the system and of course not working with elevated temperatures or high cyclic stress, etc. If you are clamping, or screwing pipe together or somehow otherwise making joints that require no welding and brazing, then only a leak test is required; see paragraph 345. If that's the case, no NDE is required at all, so do the leak test before you do any NDE
If you had a piping system with such a low probability of failure as you describe (welded or not) and that little a chance of doing damage, or causing harm to persons, company, or property and repair cost would be insignificant, then why worry about any testing at all because its doubtful that your piping would be covered by any code or regulation anyway. So if no code or requlation applies and the engineering specs don't specify NDE and, if the owner agrees with you, go for it.
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"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
http://virtualpipeline.spaces.live.com/
RE: Hydotest Prior to NDE
RE: Hydotest Prior to NDE
**********************
"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
http://virtualpipeline.spaces.live.com/
RE: Hydotest Prior to NDE
Good one! We used to have at least one pipe blow up during hydrotest of new gas pipe line installations when pipe was shipped by rail - so much for the nondestructive part of hydrotesting.
RE: Hydotest Prior to NDE
RE: Hydotest Prior to NDE
That's a vessel ... strength test.
Something about steel wheels rolling on rails. Every crossing of an expansion joint must go straight to the pipe.
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"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
http://virtualpipeline.spaces.live.com/
RE: Hydotest Prior to NDE
The NDE and Pressure Vessel Code was written with (somebody else's) blood.
RE: Hydotest Prior to NDE
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"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
http://virtualpipeline.spaces.live.com/
RE: Hydotest Prior to NDE
"We don't believe things because they are true, things are true because we believe them."
RE: Hydotest Prior to NDE
Just kidding.
Really, its kind of like Non-Destructive Testing, but some people think that if you only look at it, or don't actually perform a "test", then it should just be called "Examination". Non-destructive Examination.
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"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
http://virtualpipeline.spaces.live.com/
RE: Hydotest Prior to NDE
Cheers,
John
RE: Hydotest Prior to NDE
**********************
"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
http://virtualpipeline.spaces.live.com/
RE: Hydotest Prior to NDE
RE: Hydotest Prior to NDE
**********************
"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
http://virtualpipeline.spaces.live.com/
RE: Hydotest Prior to NDE
RE: Hydotest Prior to NDE
**********************
"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
http://virtualpipeline.spaces.live.com/
RE: Hydotest Prior to NDE
http://www.ndt.net/article/0698/hayes/hayes.htm