ASME Fixed Tube-sheet configurations

[Ronak_Patel]

Hello all .
what are the different parameter and criteria which governs the selection of ASME fixed tubesheet configuration ? (figure UHX -13.1)
My thermal team mention TEMA designation in Thermal data sheet ( BEM ) but now how to decide which Fixed TS configuration i should go for while designing TS ?
any book or literature where i can get descriptive idea about various configurations ?
Thank you in advance!!

 

[SnTMan]

Ronak_Patel, the TEMA standards would be a good place to start. This knowledge would lead you to Part UHX, Fig. UHX-31.1, Configuration (b). Configs (c) and (d) are possible but are rarely used.

EDIT: HEI Standards For Powerplant Heat Exchangers is also useful.

Regards,

Mike

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

 

[Ronak_Patel]

Thank you SnTMan for your reply .
" This knowledge would lead you to Part UHX, Fig. UHX-31.1, Configuration (b). Configs (c) and (d) are possible but are rarely used"
Actually this is what i`m trying to understand , in what conditions conf (c) or (d) are used ? everyone in my organisation take conf b when they see BEM in Thermal data sheet .

From what i understand,
There is not much difference b/w conf b and c . Using conf (c) will reduce the OD of tube-sheet and using conf (d) will get us rid of shell stresses which will come with the integration of tube-sheet and shell. These are just my interpretations so i wanted to know are they any solid criteria for using different configurations ..

 

[SnTMan]

Ronak_Patel, as you say config (c) reduces the OD of the tubesheet. It might be used if the tubesheet is an exotic material, using an ordinary material for the backing ring. For most classes of work it is likely not worth the added part and labor.

I don't know why config (d) would be used. I'd note that it places a non-renewable gasket between the fixed tubesheet and shell. Bad practice, you ask me.

Config (b) is much preferred.

EDIT: Config (d) might be used if the shell and tubesheet materials were not compatible for welding. Still, I'd avoid it if I could.

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

 

[r6155]

Conf (d) when PWHT is required for shell side or tube side.

Regards

 

[SnTMan]

Config (d) shell itself could be PWHT'd before assembly of the tubesheets / bundle. OK.

Removable channels (tubeside) are easily PWHT'd. Not dependent on config (d).

Tubesheets & tubes are common to both sides. If no welding no PWHT. No reason for config (d).

It is possible tube-ts welds would need PWHT. There goes your gasket...



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

 

[Ronak_Patel]

Thank you for your replies!!