Fin fan cooler/Air cooled Heat exchanger Header box Hexagonal threaded plug design calculation-Reg.

[Heat transfer]

Hi guys,

I am working on the design analysis calculation for a Fin fan cooler/Air cooled heat exchanger as per ASME SEC VIII DIV-1.
In plug type header box Hexgonal threaded plug design can be done as per ASME SEC VIII DIV-1 Table UG-43 as shown below

DESCRIPTION UNITS Header Box Plug
Plug Size INCH 1-1/8"
Thread Type - UNF
No of thread per inch - 12
Minimum Plate thickness required As per Table UG-43 mm 15
Used Plug sheet thickness mm 25
Minimum Threads engaged As per Table UG-43 - 7
Total No of threads engaged - 11.8
MOC - SA 105

or any other Acceptable design calculation is available?
Please advise.

 

[Jano6924]

I used to be involved in the headers design for aircooled exchangers many years ago. I don't remember ever use Table UG-43 for the hex plugs. You need to desing the entire headers (tubesheet, plug-plate, side plates, etc) per Appendix 13 of ASME VIII-1.

Regards.

 

[r6155]

See API 661 Air-cooled Heat Exchangers

Regards
r6155

 

[Heat transfer]

Hi Jano6924,

Thank you for the reply i had completed the design analysis calculation as per Appendix 13 of ASME VIII-1.
but this Table UG-43 for pipe threads or is this applicable for Hex plugs also?

 

[Heat transfer]

Hi r6155,

Is API 661 Standard provides how to justify for Hex. Plug or design of thread strength calculation?

 

[Jano6924]

No, I don't think Table UG-43 can be used for hex plugs. As I said before my involvement on these headers design was long ago, but I'm possitive I never used such table, plus I'm not sure if API-661 covers specifics on hex plugs, you need to check that by your own.

Regards.

 

[r6155]

@Heat transfer
API 661 is clear and easy to understand. Please read it slowly, and again.
Table UG-43 is not applicable.
Regards
r6155