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ViscoLine™ Annular Unit
The tubular
heat exchanger series from Alfa Laval
Applications
The ViscoLineTM Annular unit is a tube-in-tube-in-tube heat
exchanger that is ideal for the heating, cooling and pasteurization
of products with high viscosity, and products that contain
particulates. The unit is highly suitable for aseptic applications
with steam purge and leak detectors.
These units are most commonly used in conjunction with lowacid
products with average/high viscosity, such as tomato concentrate,
banana paste, sourdough, chocolate sauce, mayonnaise,
malt extract and tomato-based sauces in general.
Standard design
The ViscoLine Annular unit consists of three or four concentric
tubes. In the case of four tubes (with low service velocity),
the innermost tube is empty. The product medium flows in
between two service channels, and is heated or cooled from
the inside and outside at the same time. The unit features
easy, full inspection of the product side.
The product medium inside the tube runs in a flow that is
counter-current in relation to the service medium. If required,
the product tube can feature a hard corrugated surface.
ViscoLine Annular modules are normally connected in series
and grouped on a common frame.
The only spare parts needed are the O-rings in the header.
The ViscoLine Annular unit is provided with double
180° elbow joints that enable continuous heat treatment.
There is a maximum gap on the product side of 18 mm and a
minimum gap of 5 mm.
Standard materials
Other materials are available on request.
Product side (tubes) Stainless steel AISI 316L or SMO254
Service side (shell) Stainless steel AISI 304 or AISI 316
Frame Stainless steel AISI 304 (units can be
angled for self-draining on request)
ViscoLine Annular with open sectional view
Graphic representation of the flow pattern in the ViscoLine Annular Unit.
