Grundfos MAGNA3 Series, Installation And Operating Instructions Manual

Page: 67 / 153

Maintenance English
Plate Heat Exchanger 13
EN
EN
Finally the middle pair of bolts, and upper
and lower bolts are tightened.
If the plates are correctly assembled, the
edges form a “honeycomb” pattern, see
picture below.
Pressure test after maintenance
Before start-up of production, whenever plates or
gaskets have been removed, inserted or exchanged,
it is strongly recommended to perform a pressure
test to confirm the internal and external sealing func-
tion of the PHE. At this test, one media side at the
time must be tested with the other side open to the
atmosphere.
The pressure testing shall be performed at a pres-
sure equal to the operating pressure of the actual unit
but never above the design pressure as stated on the
nameplate.
The recommended test time is 10 minutes.
Please note that PHE units for refrigeration applica-
tions and units with media not mixable with water
must be dried after hydrostatic pressure testing.
Please consult the local office/representative of the
supplier for advice on the pressure testing proce-
dure.
Note!
The actual measurement must never be less
than the A-dimension.
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