TEMA HEX Components and Mechanical Design 1

[Sam Smith]

New to Pressure Vessel Design. I have a question regarding TEMA Type D (Special High Pressure Closure) design. I'm unable to understand components of Type D. Does it consist of shear ring/channel cover/partition plate/nozzle/stub end/diaphragm gasket/gasket of any type? Can you label it on image for clarification? Further, how did you learn about these components because I can't find it in TEMA itself.

Further, are these TEMA types (specially D type, N type etc) explained in any book/guide where mechanical design of different TEMA types can be understood?

 

[Christine74]

TEMA doesn't cover special high-pressure closure designs because they are typically proprietary designs. If you do a search on "Breech lock" you should be able to find information about how they work. Hemilok and Taper-Lok are popular alternatives to Breech-lock closures.


-Christine

 

[Vikko]

In the scope of TEMA is in RCB-1.11 the design pressure is up to 207 bar, not sure what you mean by high pressure, but I really think you are out of scope if it is above. Generally ASME B16.5 flange (and so also bling flanges, covers) are rated at ambient temperature for maximum around 400 bar in class 2500, also EN 1092 has maximum rating PN 400, these are all flanged joints that works on same principle of 2 flanges compressing a gasket for the pretension on the bolt and you can design it by the TaylorForge method (ASME VIII Div. 1 Apx 2 or EN 13445-3 11). If you go up in pressure, it becomes less and less common to make a pressure tight joint on the same principle because it would require huge flange and bolts. The TEMA type D head cover, looks more or less like a bridgeman type for high pressure, but there are many different options, the pressure inside the joint push the cover against the gasket, so the tightness is ensured also by internal pressure (and would obviously not work the other way). You should check autoclave fittings and covers to do a bit of research.

 

[Some Curious Guy]

D type is specially reserved for defining high pressure closures.
This high pressure can be proprietary design like Breech lock closures. In my experience D type is also used to denote welded diaghragm gsaket closures.
'Mechanical Design of Heat Exchangers: And Pressure Vessel Components by Alan Soler and Krishna P. Singh' is a good book to learn mechanical design of heat exchanger components. It is somewhat more therotical.

Link

You can also read ASME PTB7 Criteria for Shell-and-Tube Heat Exchangers According to Part UHX of ASME Section VIII-Division 1.

Link

I would also recommend you to read the first few chapters of " Effectively Design Shell-and-Tube Heat Exchangers by R Mukherjee ". It's a thermal design book but it describes nicely the purpose of each TEMA type exchanger.