Keep your head cool and avoid becoming hot under the collar

Dirty gas causes deposits on heat exchanger tubes hence reduces heat transfer and increase pressure loss. Both effects have a detrimental impact on operating costs. If the gas is clean, tubes with finned surfaces can be used. This significantly reduces the cost of investment. CALORIFER Engineering helps you make the right choice!

Heat exchangers with plain tubes are suitable for dirty gases on the shell side. By choosing the correct size, layout and pitch of tubes, the heat exchanger is designed to perfectly match customer requirements. In systems with finned tubes, the connection between the core tube and fin is very important. A number of different systems are available, depending on the temperature and choice of materials. By using floating tube sheets or U-tubes it is possible to ensure that the bundle is not subject to thermal stress. On the tube side it is possible to use gases, steam or liquids. It is also possible to fit tube inserts (e.g. swirls). These enhance the turbulence of the flow.

We will provide you with the most suitable solution in each case.

Finned tube heat exchanger:

Application areas

  • process industry
  • drying idustry
  • chemical industry
  • power generation
  • heating, ventilation and air conditioning industry

Product characteristics:

  • compact fin tube systems
  • hot-galvanised oval fin tubes
  • spiral wound finned tubes
  • extruded spiral finned tubes
  • welded spiral finned tubes

Plain tube heat exchanger:

Application areas

  • air pre-heater for waste incineration plants
  • coolers and heaters for applications in the chemical and process industries
  • economisers (energy supply, environmental technology)

Product characteristics

  • straight or U-shaped tubes, depending on application
  • with or without inlet and outlet cones

Operating range and size

  • tube side: vacuum operation up to approx. 80 bar
  • shell side: up to 1 barg
  • temperature: up to 1’000 °C
  • element width: up to 3 m
  • element length: up to 10 m depending on tube system


  • carbon steel
  • 1.4541, 1.4307, 1.4571, 1.4404, 1.4539, 1.4828 etc.
  • austenitic steel, highly alloyed quality, e.g. 1.4539
  • heat-resistant quality, such as 1.4828, 1.4841, 1.4878 etc.
  • non-ferrous metals such as Cu, CuNi10Fe, CuNi30
  • aluminium
  • duplex steel
  • titanium
  • nickel alloys