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For thermal solutions for viscous food the ViscoLine range is a series of highly efficient heat exchangers that have been designed to handle your food processes in the most gentle manner.


The ViscoLineTM Monotube is the Alfa Laval hygienic tube-in-tube heat exchanger ideally suited for the heating, cooling and pasteurization of products with low and average viscosity, and products that contain
fibers and big particulates.



The monotube is especially used for grape mash, diced tomato, diced vegetable and diced fruits and also sauces and soups that contain big particles.


  • Low maintenance costs
  • High working pressures
  • High working temperatures
  • Easy to expand
  • Easy to be inspected and cleaned.

Standard design

The ViscoLine Monotube heat exchanger consists of a single tube mounted inside an outer shell tube. The product medium flows inside this tube, and the service medium around it. It is a fully welded construction with a bellow on shell tube to absorb thermal expansion. ViscoLine Monotube modules are normally connected in series and mounted on support frame or full frame.

Working principles

The product medium inside the tube flows in counter current to the service medium. The product tube is corrugated or it can be smooth. The shell tube is always corrugated. The installation is maintenance
free, thus eliminating any need for spare parts.

Technical data

Mechanical design pressure

The Viscoline Monotube Unit is designed for a pressure of 15 bar (217 PSI) on the product side (tube) and 10 bar (145 PSI) on the service side (shell), depending on the connections. The unit can, however, accommodate higher pressure ratings, depending on component thickness as connection type.

The ViscoLine Monotube unit complies with the European Pressure Equipment Directive (PED 97/23/CE), and is entitled to bear the CE mark. Where the CE mark is not required, Viscoline would be manufactured according to Sound Engineering Practice (SEP). Other design codes are available as well such as ASME VIII Div.1 and others would be on request like SELO’s China Manufacturer License (SELO approval) and GOST Russia Certificate of Conformity. It is designed to operate at a temperature of 190°C (374 °F) although higher temperatures are also met. All units can be provided with an expansion joint to absorb any thermal
expansion stresses that arise.