Regarding Shell as per UG-80

[Harry Patel]

Sirs,

 

As per UG-80 When Internal pressure applicable, We have to check Shell ovality as per code.

When External pressure applicable than Ovality and with the help of template circular form checking required.

 

Client is asking for internal pressure also, with help of template  checking required.If you know any clause in ASME let me know and let me know any thumb rule and minimum length of template

 

Hope for your reply.

[manjunath madiwalar]

Hi,

Mr patel As per code minimum of template will be ID/4 also
tabulate check in & check out values at various sections compare with
std chart in code.

Regards.

Manjunath.

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[prem nautiyal]

Hi

 

Please check your shell ID in horizontal plane.

As per UG-80 difference between max. and min. inside diameters i.e. Ovality/ Out of roundness at any cross section shall not exceed 1% of nominal dia. You can aim for 0.5% as good practice.You also refer your client technical specs. for ovality permissible because some specs are more stringer and have stringent ovality control requirements.

 

You should use a D/4 template to check the peak in and peak out.

Please refer code for allowable values of peak in and peak out.

For eg. if your shell ID <= 152mm, allowed gap peak in/out is 0.8mm.

If your shell ID <=1524mm, allowed gap peak in/out is 4.8mm and so on ---.

 

Regards

 

Prem Nautiyal