ASME BPVC Sec VIII Div. 1 Appendix 14

[AlyFrederi]

Hello, new to the forum and was hoping you guys could help my coworkers and I settle a discussion.

We are working on the design of a flat circular bolted head with a nozzle through the center. ID of the nozzle is 17.25", OD of the flat head is 39.125", B.C. is 37.5", and there are 32 bolt holes (0.875" each) equally spaced.

My coworkers think that we should be able to use Appendix 14 (Integral Flat Heads with a Large, Single, Circular, Centrally Located Opening) with rim holes as per UG-39(c)(2). I am unconvinced and suspect that this design falls under the requirements of U-2(g). The real issue I'm having is the difference in wording when it comes to whether the connection has to be integral between UG-39(c)(1) and 14-1.

Any advice? Or am I totally out to lunch here?

 

[TGS4]

Why not Appendix 2?

 

[prex]

You didn't state whether or not the opening exceeds one half the head diameter. I suppose it does, so in UG-39(c)(2) you are referred to App.14 to determine the required thickness for reinforcement purposes. If you can satisfy UG-34 and UG-39, you don't need to go to U-2(g).

prex
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[Trestala]

The applicability of MA-14 is stated in 14-1(a), which does not include flat circular bolted heads. In my opinion, MA-14 is not applicable to flat circular bolted heads since it has a different moment acting on the head compared to integral flat heads.

If the opening diameter is 1/2 of the parent flange, it would be similar to a reducing flange. Would this describe your case?

The following may provide guidance:
- Chapter 2, Procedure 2-9 of "Pressure Vessel Design Manual" by Dennis Moss
- Chapter 10 of "Structural Analysis and Design of Process Equipment" by Jawad and Farr