Pipeline life expectancy
Pipeline life expectancy
(OP)
Hi everyone.
I'm completely new to pipeline engineering and need to know how to determine the remaining life of a network's section. Here are some details:
-It's an oil pipeline network
-It's a 90º bent section
-The damage that has been reported is dents and wall thinning.
So right now I've been checking some books and also ASME codes, but still I'm wondering how many factors have to be taken into the equation, I believe erosion, corrosion, thermal loadings and local stress concentration are all of them.
I read about some damage assesment graphics that relate defect length to defect depth to determine if the piping needs to be repaired, changed or not. Where can I find this? (This is good alternative to what I'm looking for).
I would appreciate if you gave some insight in this matters and how to obtain all the pertaining parameters.
Also, I'm not sure if all of this has to be done in some numerical simulation software or if there is an easier way to do it by graphs, tables, codes or else.
I know this is a whole lot of information, hope someone can help me out.
Thank you so much!
I'm completely new to pipeline engineering and need to know how to determine the remaining life of a network's section. Here are some details:
-It's an oil pipeline network
-It's a 90º bent section
-The damage that has been reported is dents and wall thinning.
So right now I've been checking some books and also ASME codes, but still I'm wondering how many factors have to be taken into the equation, I believe erosion, corrosion, thermal loadings and local stress concentration are all of them.
I read about some damage assesment graphics that relate defect length to defect depth to determine if the piping needs to be repaired, changed or not. Where can I find this? (This is good alternative to what I'm looking for).
I would appreciate if you gave some insight in this matters and how to obtain all the pertaining parameters.
Also, I'm not sure if all of this has to be done in some numerical simulation software or if there is an easier way to do it by graphs, tables, codes or else.
I know this is a whole lot of information, hope someone can help me out.
Thank you so much!





RE: Pipeline life expectancy
http://www.penspenintegrity.com/services/pdam/
http://www.penspenintegrity.com/downloads/pdam/pda...
The latter is based upon a prediction of when pipeline anomalies will achieve the dimensions corresponding to a limit state such as fracture or plastic collapse.
Overall, these are both complex subjects, and may be under regulatory implications. It is recommended that expert support is engaged rather than seeking solutions on an internet forum.
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: Pipeline life expectancy
http://primis.phmsa.dot.gov/rd/mtgs/062409/MikeRos...
I hate Windowz 8!!!!
RE: Pipeline life expectancy
RE: Pipeline life expectancy
Many moons ago I remember doing some calculations on piping with thinned walls to determine whether it could keep operating and if it could keep going how long it could keep going for with the historical rate of corrosion. I'm pretty sure it was an API standard we used.
Regards,
K
RE: Pipeline life expectancy
RE: Pipeline life expectancy
RE: Pipeline life expectancy
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: Pipeline life expectancy
I can't imagine any responsible owner / operator doing this as the consequences are too bad to contemplate.
Dents are often caused by excavator buckets and end up with not only a dent, but a gouge within the dent. These are highly prone to sudden failure caused by stress concentration at the bottom of the groove and work hardening of the material leading to failure by fatigue cracking.
I'm glad you will get some proper support on the subject.
You actually have some good material linked here, but please use this as background info for use during conversations with people that know what they are doing and not try to do it yourself.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Pipeline life expectancy
RE: Pipeline life expectancy
LittleInch:
Hahaha, same thought here. Truth is that when I was entrusted with this task those where my exact words, my knowledge could only take me so far as to plastic collapse analysis, and believe me, I know that would have gone wrong in terms of safety.
Thanks everyone.
RE: Pipeline life expectancy
At least he's not going to screw up anything that's not already screwed up.
I hate Windowz 8!!!!
RE: Pipeline life expectancy
Ran into this PHMSA presentation.
Encapsulates the main ideas.
I hate Windowz 8!!!!
RE: Pipeline life expectancy
RE: Pipeline life expectancy
Application of API 579-1/ASME FFS-1 and BS-7910 Fitness-for-Service Procedures
Presented by: Bostjan Bezensek, Shell UK, Ltd.; Isabel Hadley, TWI Ltd.; David Osage and Robert Brown, The Equity Engineering Group, Inc.
Just thought I'd throw that out there as an FYI.
Cheers,
K
RE: Pipeline life expectancy