Pressure vessel with longitudinal flanges.
Pressure vessel with longitudinal flanges.
(OP)
I am looking to design a pressure vessel in two half (180 degree) sections with longitudinal flanges that bolt together. No internal ligaments. Flat or dished heads each end. Specs. as follows:
MOC: CS (probably SA-516 Gr 70)
OD: 26"
Length: 40 ft.
DP: 50 PSIG
DT: 500 F
Does anyone have an analysis for this?
MOC: CS (probably SA-516 Gr 70)
OD: 26"
Length: 40 ft.
DP: 50 PSIG
DT: 500 F
Does anyone have an analysis for this?





RE: Pressure vessel with longitudinal flanges.
Where is the vessel to be located?
What is the design Code?
Are you familiar with said design Code?
RE: Pressure vessel with longitudinal flanges.
RE: Pressure vessel with longitudinal flanges.
RE: Pressure vessel with longitudinal flanges.
You will have to check with the local jurisdiction before building this to ensure any additional legislation is met.
RE: Pressure vessel with longitudinal flanges.
RE: Pressure vessel with longitudinal flanges.
Interesting problem. I don't have an analysis, sorry (never had to do one), but it seems like this is a rectangular or noncircular flange design issue - certainly rectangular if the ends of your "vessel" are flat. I saw a reference to a paper by A.E. Blach "Bolted Flange Connections for Noncircular Pressure Vessels" which sounds like just the thing. A good place to start anyway.
PD5500 also had an Enquiry Case - 5500/133, that provides guidance on the design of flat unstayed ends of non-circular shape and their associated flanges, which may help.
I'm thinking that you may be able to add gussets to the flange for each half to stiffen the connection without having to have ultra thick flanges or vessel wall.
Good luck,
John
RE: Pressure vessel with longitudinal flanges.
See the paper below to get some idea...
h
Start looking for FEA experts.
RE: Pressure vessel with longitudinal flanges.
RE: Pressure vessel with longitudinal flanges.
Try and find a copy of "Design of Process Equipment, 2nd Edition" by Kanti Mahajan for a design method (the third edition is available on Amazon).
Regards
Rudol
RE: Pressure vessel with longitudinal flanges.
Thanks for the tip. I have the third edition and never thought to look there for a rectangular flange analysis. Mahajan uses a tongue and groove design and I want to use an o-ring design, but I would assume that his analysis works for both. That should give me a pretty good approximation of what I need (at least for quoting purposes). I still like the idea of FEA to verify the design.
Regards,
Weldwonk
RE: Pressure vessel with longitudinal flanges.
Not (underline, underline, underline!!) trivial, but relatively low. The stiffness required for lifting and moving (taking apart and setting down) the upper half from the individual lifting lugs will be likely comparable to the internal pressures while static and resisting procvcess pressures.