Stress analysis of cross country piping
Stress analysis of cross country piping
(OP)
Hello
I have to do stress analysis of cross country (Fuel gas) piping. Though I had done the stress analysis for in plant piping,this is new for me. Are there any special considerations which I must take care? I am going to do the analysis in Caesar.
Thanks all.
I have to do stress analysis of cross country (Fuel gas) piping. Though I had done the stress analysis for in plant piping,this is new for me. Are there any special considerations which I must take care? I am going to do the analysis in Caesar.
Thanks all.





RE: Stress analysis of cross country piping
Cross country pipelines are different to on plant piping. Caesar for example does not consider buckling aspects of pipework which comes into action when you have long lengths of "cross country pipelines". Is the piping to be buried? if so and the contour of the land is not flat then the piping needs to be checked at all bends to ensure there is sufficient coverage. Caesar is strictly(as most stress packages are) for plant pipework where buckling does not play a major part.
RE: Stress analysis of cross country piping
HI DSB123 (Mechanical) you need to do your home work, Please read below:
Piping Stress Analysis just get better
Guideline for the Design of Buried Steel Pipe - July 2001
This guideline presents design provisions to evaluate the integrity of Buried steel pipe for a range of applied loads. It applies to new or existing buried pipe made of carbon or alloy steel; welded pipe; piping designed, fabricated, inspected and tested in accordance with an ASME B31 pressure piping code; and buried pipe and its interface with buildings and equipment.
http://www.americanlifelinesalliance.org/pdf/buried_pipe.pdf
Leonard Stephen Thill
Leonard@thill.biz
www.thill.biz
RE: Stress analysis of cross country piping
I know what I said is correct. You have not said otherwise. I know there are techniques for analysis of overland and buried overland piping systems. What I said , if you would be read it again, is that Caesar does not account for buckling aspects which a concern with long lines. do you dispute this???
RE: Stress analysis of cross country piping
The pipeline is overland only and not buried; If Caesar can not do this, is there anyother package?
Thanks for your tips
RE: Stress analysis of cross country piping
Unless the line is long and straight, most undulations in the terrain or normal changes in direction will be suitable to prevent excessive movement of of the pipeline, but the end anchors should consider the cumulative effect of friction on the supports.
RE: Stress analysis of cross country piping
Narendra K. Roy
Gramya Research Analysis Institute,
PO box 4016, Vadodara 390015, India
Website: www.gramya.com ; www.charismaglobal.com
RE: Stress analysis of cross country piping
Cheers
Kevin
RE: Stress analysis of cross country piping
With Steam lines you generally guide these at regular intervals such that buckling (unless you have done something totally stupid) never is a problemm/issue. However for long "ambient" lines which may be buried or not where they are not generally guided at the same frequency as steam lines or anchored at the same frequency buckling could become an issue and as such taking the results from programs such as Caesar and Autopipe as being the sole check could be frought with danger.
RE: Stress analysis of cross country piping
Before the battle, one must arm themselves with knowledge.
RE: Stress analysis of cross country piping
Is the line going to be restrained or unrestrained? Again, cross country lines are different to on plot piping as the friction factor with the ground means that even an unrestained line, if it's long enough, will be restrined over a large part of its length, and the axial forces you'll need to consider will only be over the free sections at each end.
It was due to these differences that when I was a pipeline engineer in one of the biggest contractors in the world, the Piping boys used Ceasar and the Pipeliners used AUTOpipe, with a hand calculation as per API RP 1102 done at any road & railway crossings.
Upheaval buckling can be an big issue- I've seen an offshore line which popped up and then got caught by a fisherman's trawlboard and dragged a few hundred metres. Cost a lot of money to do the repair (still the fisherman lost tens of thousands of pounds worth of fishing gear, which serves him right for trawling along a pipeline!).
RE: Stress analysis of cross country piping
RE: Stress analysis of cross country piping