Jacketed buried pipeline stress analysis

[PIPING_DESIGNER]

I have to carry out a stress analysis of jacketed pipeleine carrying crude oil from pig launcher to the pig receiver (pig launcher and receiver are above ground)
The pipeline connecting the start point (pig launcher) and the end point (pig receiver) is buried (underground) and jacketed.
- Inner pipe (core) fluid: crude oil @ 120 °C
- Outer pipe (jacket) fluid: Nitrogen gas
- Pipeline length 1500 m
- Pipes materials are carbon steel pipe
Which ASME code should I use for the stress analysis in caesar ii for the inner and outer pipe ?

 

[LittleInch]

Oh man, there are far too many issues here to answer in a single post.

Heating gas?? what is gods name is that?

how are these two pipes connected or kept separate from each other?

But I would use B 31.3 stress design if I was you, but these things are very very complex.

what sort of temp and pressure?

Any insulation on either of the lines or the annulus?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[1503-44]

I assume it is a production pipeline as opposed to a transportation pipeline, in which case it is
B31.3

Answer LittleInch's questions and we'll see what we can do.



--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[PIPING_DESIGNER]

- Nitrogen gas in the outer pipe
- Two pipes are jacketed

 

[1503-44]

Too much information!
I can't handle this information extraction process.
Bye.



--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[LittleInch]

Also look up NFPA 59A - there is quite a lot of good things in there about jacketed pipes.

but this sounds very odd and not a simple stress analysis.

Hot Nitrogen? Are you serious??

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.

 

[PIPING_DESIGNER]

I have to carry out a stress analysis of jacketed pipeleine carrying crude oil from pig launcher to the pig receiver (pig launcher and receiver are above ground)
The pipeline connecting the start point (pig launcher) and the end point (pig receiver) is buried (underground) and jacketed.
- Inner pipe (core) fluid: crude oil @ 120 °C
- Outer pipe (jacket) fluid: Nitrogen gas
- Pipes materials are carbon steel pipe
- Pipeline length 1500 m
Which ASME code should I use for the stress analysis in caesar ii for the inner and outer pipe ?

 

[1503-44]

Do you cross public land, or being that you are trying to carry gas, one or the other makes it B31.8

It may not be possible with that temperature.
Why 250°F/120°C ? You can move any crude at least some distance at much less of a temperature. I suggest you find a way to reduce it. How far apart are the pig stations?

You're going to need some huge N2 flow!

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[PIPING_DESIGNER]

- The pipeline crosses a public land.
- The distance between pig launcher and pig receiver is about 1500 m.

 

[1503-44]

31.8

--Einstein gave the same test to students every year. When asked why he would do something like that, "Because the answers had changed."

 

[LittleInch]

The design as you've described it makes no sense and does not appear to be feasible without expansion joints or a strain based design.

"Jacketed" pipe can be many things and is not well described in any code so to a certain extent to make your own rules.

But 120C??? Are you sure someone doesn't mean 120F? And hot nitrogen won't keep it hot.

But code, try both, but think you will end up with 31.3. What is the rest of the system designed to?

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.