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8.2.1 Corrosion resistance
Before entering into operation you should assure
that the media do not exceed the corrosion
resistance level of the materials chosen for your
Plate Heat Exchanger. Even unprocessed water
may contain such high level of corrosive content
(e.g. chloride content) that it may attack the plate
surface. A high temperature may accelerate the
corrosion process. Visit
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info.
For DuoSafety PHE’s, regular external leakage
inspection must be made of the plate pack
edges, to look for leaks as they will start quite
small and can quickly evaporate. Where CIP-
cleaning is carried out at regular intervals,
check approximately 30 minutes after starting
the circulation of hot CIP liquid, thoroughly
inspecting the floor below the plate pack for
any drops. Leakage is more easily detected if
the area under the plate pack is dry before the
inspection procedure starts. If the floor is not
dry, an indicator liquid must be sprayed on the
floor and on the plate pack to detect product or
CIP drops from the heat exchanger.
8.3 Shutting down
The heat exchanger must be shut down
slowly and allowed to cool naturally to
ambient temperature. Inlet valves, if used,
should be closed before closing the outlet
valves.
If steam is used as a heating medium, it must
be shut off first. In chilling duties, the cooling
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