Strees Analysis of Flowlines

[er_scec]

Hi everyone, does anyone has simulated or know about the main guidelines for the stress analysis of buried flowlines? I'm trying in Caesar II, but the data input is so painful because you will have to enter the coordinates of so many points along the pipeline and as the design code is B31.4 I only have bends and a few straight sections. I tried to import from CADWorx but it doesn't support 3D polylines to generate the bends, I also tried using the Data matrix format to import the members and coordinates to CaesarII, but there is few information in the userguide about the correct format to input the data.

Any suggestion?

Thanks in advance.
Eddie.

[jlbejaranor]

Here is what i do to solve this:

Imagine you have your 31.4 pipeline buried completely straight and horizontal and at an infinite length. At a certain distance from the point where it buries, the effect of the temperature and above ground stresses will be negligible. This means that all the rest of the buried pipeline at a bigger distance than this, does not suffer the effect of the above ground portion of the pipeline. Then your simulation will have to be done just to that distance. There is no sense in doing you simulation at bigger length. To find that length, put that "perfect pipeline" model in Caesar with the soil characteristics and run it. It will be easy because it is a straigth horizontal line! Then you will see a point where the effect is so little that it can bu cut there. Then simulate your model with the right coordinates, only to that length. You will have to input all points to the right geometry for that portion of your pipeline. Considering that your real pipeline is not completely straight and horizontal, the above ground effect will be in a shorter portion of your pipeline. You will be able to see it in you analysis. I hope this helps.

[FATHI]

With all due respespect,=Entering pipe coordinates is a routine work ..do not focus on that , it is important but you have OTHER HUGE ISSUES.

..which loads have to be considered:
- ok for temperature ( maximum AND minimum(
- ok for design pressure

but:

-one has to consider the external pressure , one the pipeline is EMPTY, and is then subjected to external pressure = the static head of the the sea level, the the isue is to check buckling similar to Vessels.

In this case buoncy ( Archimede's law !!) has to be considered. because of the up waard force..

You have also the current loads generated by waves * side ways and up waard ,..
Ho o model the wav loads ..

Again please let is list all the loads
Let is list how to combine them
Let is list thie allowable
Please add you comments and ideas, and we can all on this forum built something together instead of talking vaguely

The issue with Caesar is how to built up the loads , how to combine them and how to assess them.

[galant1960]

give me your email I will send you files for aboveground pieline ( depth pipeline is zero B31.4) and another for underground pipeline B31.8.

it's like piping , but the bends are different , you have a lot of angles different 90 and 45 degres like in piping...for the bends you must have a spec for the cold bending...and run caesar ...
with B31.4 don't need W+P+T for stress , but in B31.8 it must calculate because you have the soil weight on the pipe..
regards

[FATHI]

give me your email I will send you files for aboveground pieline ( depth pipeline is zero B31.4) and another for underground pipeline B31.8.

it's like piping , but the bends are different , you have a lot of angles different 90 and 45 degres like in piping...for the bends you must have a spec for the cold bending...and run caesar ...
with B31.4 don't need W+P+T for stress , but in B31.8 it must calculate because you have the soil weight on the pipe..
regards

my email = noaminfa@online.nl

[mridhwan]

galant1960,

please sent me the files too... really interested in the pipeline design...

my email = muhammad.ridhwan@yahoo.com

[baronwisanggeni]

give me your email I will send you files for aboveground pieline ( depth pipeline is zero B31.4) and another for underground pipeline B31.8.

it's like piping , but the bends are different , you have a lot of angles different 90 and 45 degres like in piping...for the bends you must have a spec for the cold bending...and run caesar ...
with B31.4 don't need W+P+T for stress , but in B31.8 it must calculate because you have the soil weight on the pipe..
regards

please
send me too
kusuma.ppns@gmail.com

i.m beginner ini piping...so i need many tutorial

thank u very much

[onomeanthony]

i need these files too.. email= onomeo02@yahoo.com

Thanks

[ardianroe]

hi mr. galant.

could you please email me too files for aboveground pieline ( depth pipeline is zero B31.4) and another for underground pipeline B31.8,, my email: ardianroe@yahoo.com.


many thanks.

[im4uim4uim4u]

please seed me too .i am also in pipeline stress analysis

[im4uim4uim4u]

please seed me too .i am also in pipeline stress analysis myid is mahesh.innovation@gmail.com

[Nugrawan]

dear mr.galant1960,
could you please send these files too, my email : advis.satria@gmail.com many thanks in advance