AHS Tema type heat exchanger

[ermoghidesto]

Hy everybody.
I'm trying to simulate an AHS heat exchanger where the customer uses 6 passes tube side and 4 passes shell side.
My simulation program (PRO II ver. 5.00 very old) doesn't give the possibility to input more than 2 shell passes.
So I ask this.
Is correct to consider the AHS type as an exchanger with normally 4 passes shell side as the longitudinal baffle divides the shell flow in two parts and the double shell inlet/outlet nozzles divides the flow in other two parts (i.e. 2x2=4)?
Thanks in advance for your help.

 

[srfish]

I have been around the shell-and-tube industry a long time and I have never heard of a heat exchanger with 4 shell passes. Also the 2x2=4 way of expressiing the number of shell paases is not valid because in a AHS type the shell side enters and leaves in two(2) parallel streams.