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Shell Nozzle - More than 10 Nos nozzle on tank shell at equal spacing

Shell Nozzle - More than 10 Nos nozzle on tank shell at equal spacing

Dear all,

Please help me to resolve below issue:-


In a API 650 Tank, Bottom Shell plate of 30mm thick. Tank dia more than 20m and height 30m.

13 nos nozzle located on the shell plate as shown in the attachment.

My concern is :-
1. How to check the integrity of shell plate.
2. Code reference for the spacing and other design consideration for such cases.
3. How to check the heat effect on the shell due to welding cluster of nozzles.
4. Is any other standard we need to refer for this case.

Thanks in advance smile

RE: Shell Nozzle - More than 10 Nos nozzle on tank shell at equal spacing

1) By checking reinforcing requirements of API-650, if applicable. If nozzles are small enough, they may not require reinforcing.
2) See Fig. 5.6 and Section 5.7.3.
3) Don't know- wouldn't think you need to do anything special.
4) No
If you're complying with the spacing requirements of API-650, I wouldn't expect a problem. If a reinforcing pad is required, you could use a common pad for the whole lot. Using minimum weld sizes required by the standard would help.

Note that the primary stress direction is horizontally, not vertically, so you don't have the weakening of the shell that you might expect.

RE: Shell Nozzle - More than 10 Nos nozzle on tank shell at equal spacing

Thank you JStephen,

Is ASME SEC VIII DIV I, UG-53 can be applied for checking the ligenemt efficiency??

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