TEMA
TEMA
(OP)
There is an old HX which was designed back in 1970's per TEMA. I have thru the latest inspection report on this HX, thickness values for tubesheet, shell, channel, tubes etc. I need to check that these thicknesses are ok. I believe I need to use TEMA. As a second check, I want to also check these thicknesses per UHX.
I read UHX and I liked the well-described procedure. Now I am trying to read TEMA (1999 edition) The procedure does not seem that well-laid-out. With UHX, I can follow the instructions well, but will TEMA, I am lost. I dont know where to start.
Can someone relate to my point of view? Can you please give me some instructions. Sample calcs done per TEMA will be great, but I dont have them.
I read UHX and I liked the well-described procedure. Now I am trying to read TEMA (1999 edition) The procedure does not seem that well-laid-out. With UHX, I can follow the instructions well, but will TEMA, I am lost. I dont know where to start.
Can someone relate to my point of view? Can you please give me some instructions. Sample calcs done per TEMA will be great, but I dont have them.





RE: TEMA
RE: TEMA
What type of exchanger is this (fixed tubesheet, "U" tube, floating head, etc.)? For some types of exchangers, the TEMA tubesheet calculation is very simple, but it's somewhat complex for others.
-Christine
RE: TEMA
RE: TEMA
First you check to see if shear controls using the formula in RCB-7.133 (it won't unless its very high presssure).
Then you calculate you "G" per VIII-1 Appendix 2. Most of the time this will be equal to the tubesheet diameter minus the gasket width.
Then you calculate the ligament efficiency for your tube pattern per RCB-7.132.
This leaves you with
T = ( 1.25 * G / 3 ) * SQRT ( P / n * S) + CAt + CAs
Where CAs is the shell-side corrosion allowance and CAt is the greater of the tube-side corrosion allowance or the pass partition groove depth.
RE: TEMA
What sections of TEMA do I need to focus on for design of a AET type HX.
RE: TEMA
Brian
Pressure Vessels and Autoclave Systems
www.mcabeeconstruction.com
The above comments/opinions are solely my own and not those of McAbee Construction.
RE: TEMA
RE: TEMA
If I want to repeat the design using the latest ASME UHX, how do I account for this type of joint between the tube and tubesheet?
If I want to check the design per TEMA (Note that the HX originally was designed per TEMA older than 1968), how do I account for this type of joint between the tube and tubesheet.
RE: TEMA