I am running an ASME SECTION VIII, DIV.1 calculation for a flanged pipewell (partial drawing attached). The flange is 3" 1500# F22, and the pipe is 2" 160S 347SS (customer required combination). The flange will be machined for a full penetration weld and welded from both ends. You can see from the drawing that the material removed from the flange There will be an ER309 butter layer laid on the flange, followed by PWHT of flange, and then the final attachment to the pipe with the appropriate SS filler.
The flange shown is a hubbed flange, but the welding time required will be substantial, so I'm looking at what thickness would be required for a non-hubbed blind flange. With a full penetration attachment as shown, my understanding is that the effective ID of the flange is then the ID of the pipe. If that is the case, then the diameter of the central opening is less than the short span of the flange, and I could use UG-39(b)(1) to determine reinforcement requirements. However, if the pipe ID is not the effective ID, then I have to go with UG-39(c), and ultimately Appendix 14. However, the welds referenced there in UW-13 and UG-34 aren't very representative of the type of weld we're performing in my estimation.
Is the effective ID of the flange given a weld of this nature covered in the BPVC code?
The flange shown is a hubbed flange, but the welding time required will be substantial, so I'm looking at what thickness would be required for a non-hubbed blind flange. With a full penetration attachment as shown, my understanding is that the effective ID of the flange is then the ID of the pipe. If that is the case, then the diameter of the central opening is less than the short span of the flange, and I could use UG-39(b)(1) to determine reinforcement requirements. However, if the pipe ID is not the effective ID, then I have to go with UG-39(c), and ultimately Appendix 14. However, the welds referenced there in UW-13 and UG-34 aren't very representative of the type of weld we're performing in my estimation.
Is the effective ID of the flange given a weld of this nature covered in the BPVC code?