Pipe Material
Pipe Material
(OP)
Happy Monday All,
I need to asses the integrity of a 10 meter long 10 inch pipe (since it is a dead leg). However, after months of research, we have been unable to determine its origin (MATL).
As a result, What would be the best method to determine the pipe's material and WT? are the any non-destructive methods? UT scans might be useless since there might be corrosion in the line already.
I look forward to your replies.
Thank you,
LeitoGM
I need to asses the integrity of a 10 meter long 10 inch pipe (since it is a dead leg). However, after months of research, we have been unable to determine its origin (MATL).
As a result, What would be the best method to determine the pipe's material and WT? are the any non-destructive methods? UT scans might be useless since there might be corrosion in the line already.
I look forward to your replies.
Thank you,
LeitoGM





RE: Pipe Material
... and keep track of the certs this time.
Mike Halloran
Pembroke Pines, FL, USA
RE: Pipe Material
I know there's the sample one, where you grab a cube and send it to the lab, but what other methods are out there?
Thank you
RE: Pipe Material
What are it's fittings and what material are the fitting?
RE: Pipe Material
RE: Pipe Material
Why might UT scans be useless? If you are assessing the integrity of the pipe, aren't you interested in ascertaining remaining wall thickness, assuming that the finally identified material is subject to metal loss in the environment, which can be evaluated with an appropriate UT procedure? If you have the nominal pipe dimensions, tangential radiography may also be of use
www-pub.iaea.org/MTCD/publications/PDF/te_1445_web.pdf
Steve Jones
Corrosion Management Consultant
http://www.linkedin.com/pub/8/83b/b04
All answers are personal opinions only and are in no way connected with any employer.
RE: Pipe Material
As far as I know there are no NDT methods of determining either composition or more importantly physical properties (SMYS etc). In these circumstances, you need to assume the worst and take the lowest possible SMYS of a pipe either in the plant where you are or what was available at the time. Grade B is probably a reasonably safe bet, but think about what you would say if questioned in court about why you assumed any higher value after the pipe failed and injured someone or something....
As for wt, why is UT "useless". As S Jones says, what you need to "assess the integrity" is what metal you have left today, not what you started with. However if you take enough readings (30+) you will find un corroded areas which should allow you to estimate the original wall thickness.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pipe Material
I hate Windowz 8!!!!
RE: Pipe Material
Petrotrim Services, LLC
www.petrotrim.com
RE: Pipe Material
Regardless of pipe material, fitting strength and corrosion resistance is as important/more important than pipe wall material in retaining the fluid over time.
RE: Pipe Material
NOTE: for carbon steel, meaningful PMI will require carbon content in addition to the usual alloying element percentages. And you cannot determine carbon content with an x-ray fluorescence PMI 'gun'.
RE: Pipe Material
I gather by "MATL" you are probably talking about what kind of material the pipe is made out of, and by "UT" you are probably talking about ultrasonic testing (or ultrasonic thickness...), but if by "WT" you are by any chance meaning the weight of the pipe (and while many types of at least steel or iron might really differ very little in wall density) I would add I'm not really sure how you would (non-destructively) reasonably determine the latter without some means of determining the wall thickness. One way of determining thickness is of course with reasonably calibrated application of ultrasonic thickness instruments (that as others have mentioned probably for this and other reasons should perhaps not be dismissed casually) .
RE: Pipe Material
RE: Pipe Material
I hate Windowz 8!!!!