Self-regulating heating cable
The two copper conductors are located inside an extruded semi-conductive polymer whose resistance varies with the temperature. This characteristic is used to supply the required power in proportion to the process temperature and allows the cable to be overlapped without burnout as the power reduces to almost zero when the polymer temperature limit is approached.
This technology avoids destruction by overheating in case of poor installation (overlap or crossing of cables, passing through insulation, etc.). However it is important to ensure that the pipe temperature does not exceed the maximum exposure temperature of the cable either when operating or switched off.
Constant wattage heating cables
This parallel heating technology comprises of two coated copper conductors, with nickel-chrome resistance wire around them making electrical contact via notches in the conductor wire insulation. Constant wattage cables are suited to temperature maintenance where there are no wide thermal variations and also has the advantage of a higher exposure temperature without the risk of ageing (range CWMM and CWMS). Suitable temperature control must always be provided.
A cable with correct characteristics (resistivity/section/length/voltage) connected on electric supply, dissipates an energy by Joules Effect (P=U²/R), and can be simple and cost effective solution for trace heating.
Elastomer insulated heating cables (CCSP and RCS ranges), generally used in refrigeration industries or for simple freeze protections on small pipes, water meters, etc..
Fluorpolymer insulated heating cables (SFM range) which have an excellent corrosion, mechanical, and thermal resistance, used for temperature maintenance on long pipes in petrochemical plants.
Fiber insulated cables (RCTA, CCW and RCW range) or mineral insulated cables with copper, nickel-copper, stainless steel or Inconel sheath (SMH range) particularly suited for high temperatures or for a process which requires a heat source to gradually raise the temperature of the pipeline.
The design is determined by specifications such as resistance/length/voltage and required output. These heating cables have to be designed for each application and are prefabricated in our plant.
Cables for building
Buildings and private houses are also open to the effects of cold and freezing, particularly in their non-heated annexes where the temperature of water pipes can gradually decrease if the flow is stopped (the more if the insulation is light), so far as to reach their freezing temperature with the risk of pipe rupture.
This risk applies to hot water pipes as well as cold water pipes because hot water pipes may freeze if the boiler or circulation pump fails. The prolongation of this damage (time for repairing, non-detected failure because residents are not present) will induce the same damages, with risks of long flood. A heating cable preventively installed under the thermal insulation will avoid these types of expensive damages, and the self-regulating technology, associated with a simple ambient thermostat, will reduce the electricity consumption to the only energy which is useful to save your installation (STW and SRF ranges).
Exterior areas are also exposed to the detrimental effect of cold weather such as build-up of snow on roofs and ice in gutters. To guard against these risks DIRAC proposes our U.V. resistant and weather tight self-regulating cables for effective control of freezing conditions. (SRF-RG range).
Access paths, ramps and parking areas can maintain effective snow and ice control during the cold season with constant wattage cables embedded in the surface (SPS range). In any case, DIRAC proposes to associate control devices which can not only take temperature into account, but also detect precipitations to only deliberately step in, and so reduce the electric consumption to the minimum. Please consult our site ComfortHeat for this specific application.
Skin effect tracing
Applicable for heat tracing on very long lengths of pipe (up to 25 km) with only one supply point.