Rectangular Flanges

[whtechc]

We are currently refurbishing a 20 year old solvent extraction plant. We will have to rerate all the vessels to make sure that are still within the required parameters set by the ASME code. I will be using codeware compress to help me with the calcs however there are rectangular flanges on some of the vessels. Could anyone give me a procedure or guide on how to calculate rectangular flanges
Thanks

[Ali366]

Assuming that the design is according to Division 1:
If that's rectangular blind flange, you may design it to UG-34.
If the flange is rectangular with a circular bore, the design can be according to ASME VIII Div.1 Appendix 2 paragraph 2-10.
If none of the above conditions are met, Div.1 does not provide any rules for this problem. Based on U-2(g) you may use a proper method outside the Code if it is as safe as the Code. You may use the method suggested in PD5500 enquiry case 5500/133 or finite element method.

[whtechc]

Assuming that the design is according to Division 1:
If that's rectangular blind flange, you may design it to UG-34.
If the flange is rectangular with a circular bore, the design can be according to ASME VIII Div.1 Appendix 2 paragraph 2-10.
If none of the above conditions are met, Div.1 does not provide any rules for this problem. Based on U-2(g) you may use a proper method outside the Code if it is as safe as the Code. You may use the method suggested in PD5500 enquiry case 5500/133 or finite element method.

Thanks Ali,
I will be using UG-34 for the calcs of the rectangular flanges.

[additional]

try Gasket & Gasketed joint from Jhon F. Bickford.
If I'm not wrong there's section about rectangular flange in that book. Have a save design

[whtechc]

try Gasket & Gasketed joint from Jhon F. Bickford.
If I'm not wrong there's section about rectangular flange in that book. Have a save design

Thanks mate. I will look for that book

[shm8324]

Rectangular flanges have their own special problems, and are not included in the various codes (as far as I know). For a rectangulare flange to hold pressure, it must be designed as a flat faced type flange. The gasket must go to the edge of the flange. The flange is designed as a cantilever. This is an entirely different analysis from the one set out in ASME Section VIII, Division 1, Appendix 2.
Refer below link which covers Paper on Large Rectangular Flange Design...

[link Point to another website Only the registered members can access]

[shm8324]

Rectangular flanges have their own special problems, and are not included in the various codes (as far as I know). For a rectangulare flange to hold pressure, it must be designed as a flat faced type flange. The gasket must go to the edge of the flange. The flange is designed as a cantilever. This is an entirely different analysis from the one set out in ASME Section VIII, Division 1, Appendix 2.
Refer below link which covers Paper on Large Rectangular Flange Design...

[link Point to another website Only the registered members can access]

[rihogo]

Thank you !!!

[cpchonburi]

shm8324
Thankssss