Calculations as per UG-39(b)(1)
Calculations as per UG-39(b)(1)
(OP)
Dear Colleagues,
I am designing a Horizontal pressure vessel and I have a 4"nozzle on the top of the blind of another 6"nozzle. The 6" nozzle is on shell. This leads to the a large opening in the 6" blind flange and as per UG-39(b)(1) this is to be designed as per Appendix-14 and Appendix-2. But when I read these paragraph these are applicable only for welded flat heads. Nothing is mentioned for bolted flat heads. I have attached the sketch for the same. Can someone help me to get a solution for this.
I am designing a Horizontal pressure vessel and I have a 4"nozzle on the top of the blind of another 6"nozzle. The 6" nozzle is on shell. This leads to the a large opening in the 6" blind flange and as per UG-39(b)(1) this is to be designed as per Appendix-14 and Appendix-2. But when I read these paragraph these are applicable only for welded flat heads. Nothing is mentioned for bolted flat heads. I have attached the sketch for the same. Can someone help me to get a solution for this.





RE: Calculations as per UG-39(b)(1)
If you are for some reason married to a standard blind and its thickness is not sufficient, you will have to consider the reinforcement contribted by the nozzle, per U-2 (g), that is, there are no specific rules for this.
Regards,
MIke