User Guide
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Plate Type Heat Exchangers, Single plate & Semi-welded - Installation, Commissioning and Maintenance
© Danfoss | DCS (ms) | 2019.07
BC172686461130en-000201 | 15
Maintenance
(Continued)
Mechanical Cleaning continued
Never use a metal brush, steel wool or
sand/glass paper. This will damage the
passivation film of the plates.
Never use Hydrochloric for Stainless
teel plates. Never use Hydrofluoric for
Titanium plates.
• Always remove plates/cassettes one by one
and number them in right order
• Plates/cassettes removed for manual cleaning
must be re-fitted in the same order
• Single plates may be immersed into a solvent
bath to dissolve hard fouling
Plate/Cassette replacement
If a plate/cassette has to be renewed
because of serious damage, it is
recommended to replace the plates/
cassettes next to this plate/cassette.
• Plates/Cassettes must be replaced if damaged
or not cleanable
• When ordering new plates/cassettes all data
from the nameplate is required
• New plates/cassettes are supplied with
complete gaskets ready for immediate
installation
Gasket replacement
Glue free gaskets / Sonder Snap, Sonderlock &
Hang-on gaskets
These gaskets are mounted without the use of
any glue. They are positioned by pushing the
gasket fully down into the gasket groove or
fastened by special devices. Make sure groove
and gasket are clean.
Glue type gaskets
The surfaces need to be clean and free of oil. Only
use chloride free glues like Pliobond 20 or 30,
Bostic 1782, 3M EC 1099 and Bond Spray 77.
Follow the instructions of the manufacturer.
CAUTION:
When using commercial solvents and
adhesives, follow the manufacturers
recommendations carefully. Most of
these solvents are hazardous.
Semi-welded gaskets
The 2 types of gaskets in Semi-welded heat
exchangers - ring gaskets for refrigerant side
and field gasket for liquid side - can be replaced
independently (see fig. 6).
Before fitting chemical cleaned plates
they need to be thoroughly rinsed
with fresh water!
