Appendix 2 Flange Strategy
Appendix 2 Flange Strategy
(OP)
I have not done many designs on very large flanges and would like some advice. I have a customer who has requested that their vessel have a bolt on head. The vessel has a 36" ID, and a design pressure of 800 psi. What is the most economical type of flange to attach. I am using COMPRESS, but I dont have much expirience with these large flanges, so I dont how to make it economical.





RE: Appendix 2 Flange Strategy
Your ID rules out the most economical, which is to use a standard flange. Obtaining the Pressure Vessel Design Manual by Dennis Moss will provide you with a solid design strategy to start with.
RE: Appendix 2 Flange Strategy
RE: Appendix 2 Flange Strategy
I have used Texas Flange before, the following is note from them:
A Quick Note on B16.47
ASME has incorporated the MSS-SP44 specification into B16.47 Seiries A and the API 605 Specification into B16.47 series B. They have also added Blinds to these two specs. You may note that these specs include only Weld Necks and Blinds. For Slip-On's over 24" you must refer to either Industry Standard (which are not automatically covered by ASME) or Boiler Code Flanges. If you need help deciding which flange best suits your application feel free to contact us.
RE: Appendix 2 Flange Strategy
RE: Appendix 2 Flange Strategy
cheers,
gr2vessels
RE: Appendix 2 Flange Strategy
However I would still like to do a cost comparison for machining the custom one I came up with, or ordering a 600# 36" Forged Flange.
I am not sure though to go with a slip-on or a weld neck. Especially since a head is being attached to the flange, it may be costly to order a head with a long straight flange in order to attach a slip-on.
RE: Appendix 2 Flange Strategy
Regards,
Mike