Computational Flexibility analysis, help choosing between two pipes selection criteria 2

[drakkkko]

Dear all,

I need your opinion, based on your experience:

About selection criteria for steel pipes for flexibility analysis, setting aside both those which are fluid services category M and where indicated by customer, which of following two criteria is correct for computational flexibility analysis:

1.- Diameter greater than or equal to 4" and fluid temperature greater than or equal to 149 ° F.
2.- Diameter greater than or equal to 4" and fluid temperature greater than or equal to 302 ° F.

The context of this question is related to the fact that I must refine the selection of pipes for computational analysis, conditioned to a very short time by the client. Would be help me to adopt the second criteria, if it is right and is according with good design practices.

Please your help.

Thank in advance.

 

[IRstuff]

Is it that much work to run both?

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[RVAmeche]

There are industry standards such as the PIP standards. They have a stress analysis section that contains a nice graph showing the size/temperature and whether designs would typically require visual analysis or computer analysis based on CS or SS. Obviously there may be outliers depending on the equipment you're connecting or if you have a particularly inflexible path, which is where engineering judgement comes into play.

 

[drakkkko]

Thank you RVAmeche, I will search.

IRstuff the idea is select pipes (more than 30 fluid services only, more 90 PFD currents), then modeling and run..as I said time for developed those calculation is very short.

 

[KevinNZ]

Regardless of temperature I would recommend stress analysis for gravity, wind and seismic loads for larger pipe. Also for loads on equipment the piping is attached to.

Working out design loads for support structures for complex piping is easy with piping stress analysis programs.