The name is splited in three portions e.g 23-192-BEM
1st Position : 23 : Defines, ID of Vessel
2nd Position : 192 : Defines, Tube length
3rd Position : BEM : it further splited in three parts as per fing N-1.2
the 1st section, defines the Type of Front head (B for Bonnet Integral cover)
the 2nd section, defines the shell type (E – One pass shell)
the 3rd section, defines the type of rear head (M – Fixed tube sheet, stationary head)
Above figure shows typical flow arrangement inside a heat exchanger.
Typically for a heat exchanger, their are two type Tube Bundle exist. see the picture below.