HRS Annular Space Heat Exchangers - Unilever UK
HRS Annular Space Heat Exchangers-AS Series Margarine Application

Annular Space Heat Exchangers – HRS AS 4 Series

The HRS AS 4 Series is a complete stainless steel quadruple tube heat exchanger designed for applications with viscous fluids. The product flows through the annular space and the service fluid flows through the service tubes to ensure even heating or cooling. The removable inner tube allows for easy inspection of annular space. Using HRS’ corrugation technology, heat transfer and efficiency are increased over standard smooth tube heat exchangers. In addition, effects of fouling are minimised.

With the HRS AS 4 Series it is possible to offer designs with a high pressure on product side due to increased tube wall thickness. This makes it the ideal heat exchanger for very highly viscous food industry applications.


  • Higher viscosity products
  • Fluids containing fibres or small particulates
  • High Pressure Applications


Standard Materials of Construction:

  • Service side: AISI 304 stainless steel
  • Product side: AISI 316L stainless steel
    Other material options available

Standard Connections:

  • Service side: Flange
  • Product side: Clamp
    All flange & clamp types available

Surface Finish:

  • External: Polished
  • Internal: <0.8μ
    Other surface finishes available

Standard Design Conditions:

  • Service Side: 10 bar/185°C
  • Product Side: 25 bar/185°C

Design Code and Compliance

  • PD 5500, PED 2014/68/EU, ASME
  • FDA, 3A, TR CU 032 and DOSH Compliant

HRS Annular Space Heat Exchangers

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