Hi everyone!
This is my first thread here, and I’m sure it won’t be the last!
I’ve searched the forum for an answer, but I haven’t found one—so I’m relying on your expertise.
I’m designing a vessel according to ASME BPVC Section VIII, Division 1 (2023), and I’m calculating the pipe per UG-27(b).
My question concerns the joint efficiency to use. I came across the 4th answer in this thread : https://www.nationalboard.org/PrintPage.aspx?NewsPageID=144. I have a similar vessel setup: a pipe, two nozzles spaced 1500 mm apart, and two flanges.
No ligament efficiency — got it;
Cylinder joint — okay;
Nozzle joint — okay;
But why are the circumferential joints multiplied by two? Is this related to converting circumferential to longitudinal joints? If so, how is that done?
I’ve seen rules for converting ligament efficiencies (UG-52/53), but not for joint efficiencies.
Also, where exactly in UG-27 does it say that I should use longitudinal joint efficiencies only ?
Thanks in advance, and have a great weekend!
Martin
This is my first thread here, and I’m sure it won’t be the last!
I’ve searched the forum for an answer, but I haven’t found one—so I’m relying on your expertise.
I’m designing a vessel according to ASME BPVC Section VIII, Division 1 (2023), and I’m calculating the pipe per UG-27(b).
My question concerns the joint efficiency to use. I came across the 4th answer in this thread : https://www.nationalboard.org/PrintPage.aspx?NewsPageID=144. I have a similar vessel setup: a pipe, two nozzles spaced 1500 mm apart, and two flanges.
No ligament efficiency — got it;
Cylinder joint — okay;
Nozzle joint — okay;
But why are the circumferential joints multiplied by two? Is this related to converting circumferential to longitudinal joints? If so, how is that done?
I’ve seen rules for converting ligament efficiencies (UG-52/53), but not for joint efficiencies.
Also, where exactly in UG-27 does it say that I should use longitudinal joint efficiencies only ?
Thanks in advance, and have a great weekend!
Martin
