Dear All,
Can any one guide me regarding the design of ASME B16.47 Series A flanges as per ASME Sec VIII Div 1 APP 2 design and Gasket seating conditions.
As per client requirement I have to design the standards flgs of 16.47 series A flgs as per APP.2 .
Flange (48") dimension as below.
ID= 1180 mm , Neck thk =20mm ...
What are the criterias that can't change in the standard flgs.? like OD.. PCD ,Nominal Bolt size,No. of Bolts, full bolt Load (Sa*AB) option in PV elite 2010. etc....
Pls. kind me regarding the above matter, as while designing i found that dimensions and nominal bolt size to be changed.
Regards


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Hello amit8808

You did not specify which programme you were using, either PV Elite of CodeCalc.

According the ASME Section VIII, Division 1, Table U-3, if you specify a B16.47 flange, there is no need to do the analysis per Appendix 2. The flange is acceptable as it is.

If you deviate in any way from the dimensions set out in ASME B16.47 you are obliged to do the analysis per Appendix 2. There is a warning in Appendix 2.

Appendix 2, paragraph 2-2(d)(1) prohibits you from machining a hubbed flange from a plate. I suggest you read that note, as is give exact details for fabricating a hubbed flange from plate (or bar).

You can of course make a flange without the hub from plate using the geometry in B16.47, but an analysis per Appendix 2 will be required.

You can change everything what you want about the flange, but every mm/inch that the flange diverges from the standard flange you have to recalculate the completly flange.

To put it briefly you can not use a standard flange wenn you change a dimension from the flange.

You have to recalculate it with COADE, and that is simple in my opinion. (15 minutes work)

Hello Kiinge

You cannot change any dimensions of the flange, that why we refer to ASME B16.47 as a 'Standard'. The only thing you change is the material and the dimensions of the gasket.

If you have a copy of PV Elite, it will look up the dimensions of the flange for you. All you have to do is add the gasket details. That's it.

I am not sure where you are having a problem.

We are at the same level, but you can copy the standard b16.47 flange. But wenn you change the boltcircle you have to recalculate the strength of the flange, with COADE for example.

If you order a B16.47 flange, and alter it in any way, you are obliged to carry out an analysis in accordance with the code (ASME for example). If the flange is not altered, there is no need to do an analysis (calculation).