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Paraflow Plate Heat Exchanger
Instruction Manual
Section 3.0 Issue 5
Page 12 of 36 June 13, 2008
Plate Construction
All plates are designated as either diagonal flow or
vertical flow
(Figure 6) based on their flow pattern.
Plates are pressed in thicknesses between 0.4 - 1.2
mm (0.016 and 0.047 inches) in a variety of
materials (see Plate Materials below). The plate
corrugation pattern alternates from plate to plate to
provide support at the points of contact. One type of
corrugation pattern looks like a washboard. It
provides a wide gap between plates with contact
points about every 1 to 3 square inch of heat
transfer surface area.
Another design is the chevron pattern of relatively
shallow corrugations with support provided at
peak/peak contact. Alternate plates are arranged so
that corrugations cross to provide contact points for
every 0.2 to 1 square inch of surface. This greater
density of contact points in the chevron pattern
allows a higher differential operating pressure for a
given plate thickness than the washboard pattern.
Mixing Plates
To obtain optimum thermal and pressure drop
performance while using a minimum number of heat
exchanger plates, plates of two or more corrugation
angles may be mixed within the same frame. This is
available for many APV Paraflow Plate Heat
Exchanger models.
Mixing plate angles results in flow passages that
differ significantly in their flow characteristics. This
allows the Paraflow design to be fine tuned in a
single or even multiple pass arrangement to closely
match to the thermal and pressure drop
requirements of the application.
Plate Material
Paraflow plates may be pressed from 304 or 316
stainless steel, Avesta 254SMO or 254SLX, Nickel
200, Hastelloy B-2, C-276 or G-3, Incoloy 825,
Inconel 625, Monel 400, Titanium, Titanium-
Palladium or other specialty alloys as required to
provide suitable corrosion resistance to the liquids
being handled.
Duo-Safety Plate
The APV Duo-Safety heat exchanger plate is a
double wall plate manufactured from two loose
plates pressed together at the same time to form a
pair. Each APV Duo-Safety plate pair is equipped
with a non-glue Paraclip gasket, which seals and
holds the pair together.
The space between the two plates of the APV Duo-
Safety plate pair serves as a safety zone in case of
through-plate leaks from corrosion or wear. Should
this occur, the liquids will not be mixed, but will be
discharged between the two walls into the
atmosphere. This provides a high level of certainty
that liquids will not be cross contaminated. The APV
Duo-Safety plate pair also can be dismantled for
cleaning between the two plate walls.
Paraweld Plate
The APV Paraweld plate is a right and left hand
plate laser welded together to form a plate pair. This
welded plate is particularly suited for use with
refrigerants such as ammonia and Freon, or
aggressive liquids that would otherwise attack the
gaskets in a conventional heat exchanger plate.
When the welded pairs are installed in a frame, each
pair is separated by elastomeric seals.
Vertical Flow Diagonal Flow
Figure 6
Kemper County MM218132 Approved