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Hydotest Prior to NDE 2
- Thread starter ppmsb2008
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2
- #2
Well, I'd say its a little more than a violation,
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)
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)
I've really just got to say if I saw that proposal, I'd immediately go for the shotgun.
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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)
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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)
- Thread starter
- #6
Well, if its only 10%, then do it before hydrotest.
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)
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)
racookpe1978
Nuclear
Look at the danger involved: NDE is there BECAUSE some welds fail.
(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?)
(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?)
I have a question about this. I think that B31.3 allows for a hydrotest in lieu of NDE. However, as you get to it depends on the situation whether this is wise or not. If you were doing a relatively low pressure application with extremely low likelihood of failure on a piping system (low cost) where failure would likely result in little to no appreciable action, then why would a hydrostatic test not be done in lieu of an Xray or other test?
The OP's question implied he had NDE requirements that he should have been putting before hydro, so we all assumed welding was the method he would use to make the joints.
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
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
Hydro test is a form of Non Destructive Examination. Also, NDE covers the gammut from UT to RT to Dype Pen testing. So my question to the OP is - what NDE is required on your system? If it is RT or LPT or UT of the welds, then it must be done prior to hydro.
like a weld test.
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"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
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"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
Hydrotest is NDE only when luck is on your side.
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
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
racookpe1978
Nuclear
Reminder:
The NDE and Pressure Vessel Code was written with (somebody else's) blood.
The NDE and Pressure Vessel Code was written with (somebody else's) blood.
so far anyway.
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"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
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"The problem isn't working out the equation,
its finding the answer to the real question." BigInch
Not Do Enything
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
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
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