Your Trusted PHE Provider!
Moody Heat Exchangers
  • Call
    01777 701141
  • Email

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 annular unit is the Alfa Laval hygienic quadruple
tubular heat exchanger ideally suited for the heating, cooling and
pasteurization of non-Newtonian products with high viscosity, and
products that contain particulates.


These units are most commonly used in conjunction with low acid products with average/high viscosity, such as tomato concentrate, banana paste, sourdough, chocolate sauce, mayonnaise, malt extract, starch, baby food, curds, and tomato-based sauces and seasonings in general.


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

Standard design

The VLA unit consists of four concentric tubes. 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 by removing the tube insert. The outer shell is corrugated and the other three concentric tubes are not corrugated, smooth. If required, the product tube can be corrugated. To achieve a more even temperature on the product, static mixers can be welded on outside the third concentric tube. ViscoLine Annular heat
exchangers are connected in series on product side and in parallel on water/service side and grouped on support frame or full frame.

Working principles

The product medium runs in between the second and the third concentric tube and is counter-current relation to the service medium. The only spare parts needed are the O-rings in the header. There is a maximum gap on the product side of 49,2 mm (1,9 inches) and a minimum gap of 5,8 mm (0,2 inches).

Technical data

Mechanical design pressure

The Viscoline annular unit is designed for a pressure of 15 bar (217 PSI) on the product side (tubes) and 10 bar (145 PSI) on the service side (shell), depending on the connections. The unit can, however, accommodate higher pressure ratings up to 100 bar, depending on component thickness as connection type. The ViscoLine Annular 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. Static mixers can be included to increase turbulence and guarantee an homogeneous thermal treatment.


For both product side (tubes) and service side (shell) we can offer:
SMS, DIN 11851, DIN 11864, Tri-Clamps, Flange and other on request.


• Protection sheets.
• Thermal insulation.
• Video inspection.
• X-Rays measurements & certificates.
• NDT testing & certificates.
• Other tests, documentation and certificates on requests.