Purpose - For use in application where the temperature of the process fluid must be maintained as it passes through the hose. In some applications, an additional 'melt out' facility may also be required.

Description - The heating element comprises either of a resistance or self-regulating element spirally wrapped around the hose assembly. Resistance element heated hoses usually also require a temperature sensor to be built into the construction. The power leads and (if applicable) temperature sensor leads emerge from the hose assembly at one end, through glands and conduits. The thermal insulation is foam rubber, silicone foam rubber for temperatures above 80ºC. The outer cover may be a Polypropylene Braid or Stainless Steel wire braid with a rubber cover if necessary, or a ribbed PVC waterproof sleeve.

Design - Each hose is custom designed and built to suit the requirements of the particular application. Application details must be supplied by filling in an 'ETH Hose Questionnaire' available from the download section of the website. Generally for Hazardous Area, particularly 'ZONE 1', the Self Regulating of heating element is employed, with or without a temperature senor and controls and flameproof gland and conduits are also required. The watts per metre of the heating element, the pitch of the spiral on the hose and the thickness of the thermal insulation are all calculated in accordance with established formula to give the required maintained temperature.

Specification - All as per the page called "Size and Specification", except that the minimum bend radius is tripled and the outside diameter and weight are significantly increased in line with particular design.  Maximum ETH Hose Assembly Lengths are as given for Corroflon GP,SS.

Limitations

1" PTFE lined PN10 flange spigots on heated hoses can only have a maximum flare diameter of 50mm, not 63mm.

If the hose is "hanging", straight or at 90°, under its own weight, special construction is required, so advise Aflex Hose accordingly.

Minimum ETH Hose Assembly length when collars are used 750mm.