Heat transfer hoses and double-jacketed hoses

Jon Lawson

HDM hose systems with DN 2 to DN 25 diameters are used to transfer viscous or gaseous media while maintaining constant temperatures. Depending on the application, this may require heating or cooling. Subject to consideration for temperature classes and ignition groups, these systems are also suitable for use in explosion hazard areas.

The double-jacketed HDM 95/200 hoses from Hillesheim actually represent a 'hose within a hose’ system.The inner hose conducts the medium. It is completely surrounded by flowing heat carrier, for instance, water, steam, thermal oil, etc. This ensures optimal heat transfer throughout the entire length of the hose. Connections for the heat carrier are provided by special fittings at the side of both hose ends. The pressure-stable inner hose is preferentially fitted with pipe connectors for conventional threaded olives. The HDM 95 series is suitable for applications to 95°C. The HDM 200 series can be used at operating temperatures up to 200°C. Hoses in the HDM 95/200 series can be fitted with thermal insulation to prevent heat losses; this consists of a robust outer jacket and end caps.

The HDM 60 (max. 60°C) and HDM 62 (max. 200°C) heat transfer hoses from Hillesheim are built similar to electrically heated hoses. In these hoses the heating conductor is replaced by a wound hose in which the heat carrier flows. Heat transfer hoses can be ordered with the heating carrier hose wound in bifilar fashion such that both the inlet and outlet connections are at one hose end. Types with through-flow heating carrier hose and connections at both hose ends are also available.

This arrangement permits ‘series circuits’ in which multiple hoses, or the heating of an attached tool can also be realised. Heat transfers are not entirely comparable with that of completely surrounded HDM 95/200 systems. However, HDM 60/62 hoses do have the advantage that leaks in the inner hose will not mix the medium with heat-transfer oil, thus there is no danger for the tempering device.

Tempering is accomplished in both hose systems by way of an existing water or steam system or in conjunction with conventional tempering devices that can be used to heat as well as to cool.

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