WRC 297 Limitations

[2busyatwork]

I am working on a nozzle load calculation on a small pressure vessel. The nozzles are 2" pipe. As I look at paragraph 3.2 in WRC 297, there is a statement that for thin-shell theory to be valid, d/t must be greater than 20. That seems to prevent this bulletin from being used for small nozzles. What other methods are applicable for calculating stress in nozzle/shell joints for small nozzles?

 

[PipingEquipment]

You could do an FEA analysis if you have the mathematical ability or software, FEA is way more accurate than WRC anyway.

 

[LSThill]

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[gr2vessels]

That's the reason that you don't apply the WRC 107 to nozzle less tha 3" NB.
Cheers,
gr2vessels

 

[bhushan76]

Use FEA.But i wonder why do you need to perform nozzle load calculation for a 2" nozzle? Such small lines are usually not "stress critical".

 

[2busyatwork]

Thanks for the responses. Our customer apparently has an aversion to pipe supports. The customer specification has a generic nozzle load table that has significant nozzle loads for nozzle sizes down to 1".

 

[LSThill]

2busyatwork (Mechanical)

Technical Note:

Please review WRC 497 Limitations