Construction

Construction

  
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Plate & shell heat exchangers (PSHE) have a shell-side and a plate-side. The plates are welded in the desired numbers to a plate pack. After the plate pack is placed into a shell the end plates are welded. The shell can be selected in different diameters which also allow eccentric assembly of the plate pack.

All seals are fully achieved without gaskets. An exception is the "open able" version. This is equipped with a flanged end plate to the shell. This allows the plate package to be removed from the shell.

The plate side connections are always at the ends (heads) of the exchanger. The connections for the shell side are mounted on the shell. Plate side connections always have fixed sizes; connections on the shell side are variable.

PSHE model name	Heat transfer area (m2)	Nozzles Plate-side	Nozzles Shell-side
PSHE 2	0,5-5	25	20-80
PSHE 3	1-50	50	25-250
PSHE 4	3-100	80	25-300
PSHE 5	5-200	100	25-350
PSHE 6	6-350	125	25-500
PSHE 7	8-550	150	25-500
PSHE 9	15-1000	200	25-700
PSHE 14	30-2000	300	25-1000

Multiple passes at the plate - and shell side are possible by applying stoppers and flow directors. Also the space between the shell and the plate pack can be partly filled with flow directors. In this way an optimum flow over the heat exchanger is possible.

Plates are available with different configurations. The configuration is visible in the model number. The model names are usually codes for HH and LL. These codes are related to the slope of the flow channels in the plates. LL indicates the type of a low resistance, type HH gives a better heat transfer.

For encoding the heat exchangers a fixed scheme is used. For example in PSHE 5HH-340/2/1 the plate size is specified first (5), followed by the configuration of the plates (HH). Then the number of plates (340) followed by the number of passes on the plate side (2) and the number of passes on the shell side (1). There are also a number of possible additions for specific applications.