Half-pipe jacket
Half-pipe jacket
(OP)
Installing a Code (U stamped) half-pipe jacket on the outside of a vessel. What part of Section VIII-1 determines the weld along the two sides of the half-pipe? Can it be fillet only, or does it need to be beveled? There are lots of sections that could apply, Appendix EE is there too.
Anybody familiar with the half pipe jacket constructin to Code?
Anybody familiar with the half pipe jacket constructin to Code?





RE: Half-pipe jacket
Author Jawad, M.H. (Nooter Corp., St. Louis, MO (United States))
Publication Date 1994 Aug 01
Other Number(s) ISSN0094-9930; CODEN: JPVTAS
Resource Type Journal Article
Resource Relation Journal of Pressure Vessel Technology ; Vol/Issue: 116:3
Subject 420200 -- Engineering-- Facilities, Equipment, & Techniques; JACKETS-- DESIGN;PIPES-- JACKETS;
Description/Abstract Rules for the design of half-pipe jackets were developed by the ASME Subgroup on Design of Section VIII. This article gives the background information for the derivation and various assumptions made in developing the rules.
RE: Half-pipe jacket
cstools.asme.org/csconnect/pdf/R6636.pdf
RE: Half-pipe jacket
RE: Half-pipe jacket
What's the fluid in the jacket? Will the jacket be in cyclic service? If in cyclic service, I would follow the nonmandatory guidance in Appendix EE...through-thickness weld plus fillet weld.
Also have a look at this thread292-12586: Half-Pipe Jacket for more discussions on half pipe jacket welding.
RE: Half-pipe jacket
RE: Half-pipe jacket
My experience with fabricators has been that the purchaser can specify either fillet welds or full-penetration welds with fillet backing.
The cost difference is typically large, and it is very difficult to perform "full penn" welds on smaller half-pipe configurations (~2"NPS and smaller)
I have found the kind and knowledgable people at ROBEN MFG to be a worthwhile asset and have discussed this very issue with them......
http://www.robenmfg.com/projects_halfpipe.html
-MJC
RE: Half-pipe jacket
Full penetration welding is very difficult with a tight pitch between pipes.
This is why we have not built one of these in 20 years.