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Alfa Laval Gemini Plate Heat Exchanger.

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General cooling/heating for pharmaceutical, brewery and beverage
applications when a mix-proof design is required. To secure the
cross-contamination safe feature, water or water-like fluids are
Working principles
Channels are formed between the plates and the corner ports are
arranged so that the two media flow through alternate channels. A
unique distribution area provides an efficient flow over the plate surface.
The heat is transferred through the plate between the channels, and
a complete counter-current flow is created for the highest possible
efficiency. The chevron corrugation of the plates provides the passage
between the plates, supports each plate against the adjacent one and
enhances turbulence. The high turbulence resulting in efficient heat
transfer and high surface shear forces to minimise fouling and the
build-up of biofilm. The plates are reversible and have a parallel flow,
which means that only one type of gasket is needed.
Heat exchanger design
The plate heat exchanger consists of a pack of corrugated metal
plates with port holes for the passage of the two fluids between which
heat transfer will take place.
The plate pack is assembled between a fixed frame plate and a
movable pressure plate and compressed by tightening bolts. The
plates are fitted with a gasket, which seals the inter-plate channel and
directs the fluids into alternate channels. The number of plates is
determined by the flow rate, physical properties of the fluids, pressure
drop and temperature program. The plate corrugations promote fluid
turbulence and support the plates against differential pressure.
The plate and the pressure plate are suspended from an upper
carrying bar and located by a lower guiding bar, both of which are
fixed to a support column. Connections may be located in the frame
plate and/or in the pressure plate.
Gemini plates
The Gemini plates consist of two plates with a small air gap in
between. Contact with the atmosphere is safeguarded around the
whole periphery of the plates. The Gemini double wall plates will give a
cross-contamination safe design, as a crack in a plate will not result in
mixing of the two media.

Gemini plate heat exchangers are supplied with our standard glue-free
Clip-On gaskets of a double-gasket design. The double-gasket design
has two sealing surfaces between the product and the cooling/heating
media. This ensures that no intermixing will occur if one of the gaskets
should leak. Instead, the leakage will drain into a chamber and then
out into the atmosphere.
The Gemini plate heat exchanger is available in either the M-series or
the BaseLine frame.
M-Series frame
This is our standard frame where the frame plate material is epoxy
painted mild steel. The frame is available with optional lining in various
BaseLine frame
The BaseLine frame is a solid stainless steel frame with fixed or
adjustable feet. The tightening bolts are equipped with ball bearing
washers in order to facilitate easy opening and closing of the unit.
The M6-MGBase is also available with connection plates which allow
several heat exchangers in one frame unit.
Technical specifications
Plate material
Stainless steel AISI 316 pressed from sheet material with Ra < 0.3.
Gasket material
Nitrile-FDA, EPDM or EPDM-FDA. Clip-On design
Threaded ISO pipe connections
Flange connections
IN 11846-1 (Range A), DIN 11851
SMS 1146, BS/RJT 4825 Part 5
IDF/ISO 2853, Clamp ISO 2852
Mechanical design pressure/temperature
(FG Frame) PED, pvc ALS 16 barg / 180C
ASME 150 psig / 350F
PED 10 barg / 160C

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