Maintenance
Step 11
If the heat exchanger does not seal when measurement A has
been reach ed, it can be tightened further to A mi nus 1.0% .
Pressure test after maintenance
Before the start-up of production, whenever plates or gaskets have been removed, inserted or
excha nged, it is strongly recommended to perform a pressure test to confirm the intern al and
external sealing function of the heat exchanger. In this test, one media side at a time must be
tested with the other side open to the ambient pr essure. When multi-pass set up, all sections of
the same side must be tested simultaneou sly.
Caution!
The pressure testin g shall be performed at a pressure equal to the operating pressure of
the a ctual unit but never above the design pres sure as stated on the name plate.
The recommended test time is 10 minutes for each media.
Consult your local Alfa Laval representative fo r advice on the pressure testing procedure.
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28 Instruction Manual - Plate Heat Excha ngers 3490010217 EN 2016-06
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