CLARIFICATION OF CLEARENCE BETWEEN SHELL ID TO TUBESHEET OD FOR AET TYPE HEAT EXCHANGER 1

[sarawana]

Dear Frds,

Kindly clarify how much clearance for floating head TUBESHHET O.D. to shell id for shell & tube heat exchanger type (AET) & also specify if STD available.

thanks & Regards,
saravan.

 

[SnTMan]

saravanan.E., I am not aware of any particular standard for this clearance. I am speaking from memory here, but one software I was familiar with used as defaults something like this:

1/4" 3/8" up 24" diameter,
3/8" 1/2" to perhaps 60" dia.
1/2" 3/4" over 60'

These are minimum diametral clearance versus nomininal exchanger diameter. Clearances may be greater.

I thought I had provided this info in an older post but, if so, I have been unable to find it

EDIT: Found something in writing

Regards,

Mike

The problem with sloppy work is that the supply FAR EXCEEDS the demand

 

[r6155]

You can use the same clearance of baffles, see TEMA 10th edit Table RCB-4.3

Regards

 

[SnTMan]

r6155, yes you can but floating head clearances are typically greater. These clearances have no effect on performance as do baffle clearances.

In the case of packed floating heads or externally sealed floating tubesheets you definitely want a greater clearance for the floating tubesheet. You want the baffles sliding against the shell during bundle insertion / pull, not the finely machined tubesheet OD.

The problem with sloppy work is that the supply FAR EXCEEDS the demand