|Range||Raychem FHT4 Constant Wattage Cable|
FMT and FHT are constant wattage parallel circuit heating cables designed for pipe and equipment heat-tracing in industrial applications. This family offers an economical alternative to self-regulating heating cables but requires more skill for installation and also requires more advanced control and monitoring systems.
Its unique round geometry provides excellent flexibility during installation as it allows for bending in every direction. The heating element which is the most fragile part of any constant wattage parallel circuit heating cable is protected by a PTFE insulation tape that eliminates shear stresses during flexing and also acts as a shock absorber, thereby providing a high level of protection. The heating cables can be used for frost protection and process temperature maintenance requiring high power output. The heating cables are zone parallel heaters constructed from a heating element wrapped around two parallel conductors. The distance between conductor contact points forms the heating zone length. The parallel construction allows it to be cut-to-length and terminated in the field.
FMT heating cables can withstand routine steam purges and temperature exposure to 200°C power off. They can be used to maintain temperatures up to 150°C (depending on cable type) and are only available in a 230 Vac version.
Traced Surface Type:
The FMT and FHT heating cables are approved for use in hazardous areas by Baseefa Ltd.
*By design. Temperature classification (T-rating) has to be established by using the principles of stabilised design or the use of a temperature limiting device. Use TraceCalc design software or contact Pentair.
|Heating Cable||Voltage (VAC)||Nominal Power Output (W/m)||Max. Power Output (W/m)||T6 (86°c)||T5 (100°c)||T4 (135°c)||T3 (200°c)||T2 (260°c)|
|Cold lead length||2.5 m|
|Maximum intermittent exposure temperature (power off)||260 °C|
|Minimum bend radius||25 mm|
|Minimum Clearance||50 mm|
|Minimum installation temperature||-60 °C|
|Supply Voltage||385 - 415 VAC|
We make every effort in answering your questions. Below is a list of those questions we are frequently asked. Click on a question to expand its answer.
Self limiting / self regulating heating tape adjusts heat output to equal the heat loss from the pipe work. As pipe temperature falls the electrical conductivity of the semi-conductive core increas...
Yes, utilising our in-house design facilities, we can design your complete trace heating requirement.
Yes, when using trace heating on plastic pipes ensure that ATE- 180 aluminium tape is used to help disperse the heat around the pipe.
Yes, thermal insulation is required on all heat trace applications. Without insulation, surface heat losses can increase approximately 4-5 times.
Most applications can simply be straight traced, reducing costs of materials and installation time without compromising on operational requirements.
If the surface area of the pump is substantially greater than that of the adjoining pipework then extra heating cable may need to be considered (depending on wattage of cable installed). Pumps and ...
Generally, no maintenance of our trace heating systems is required but it is recommended that the system is checked for operational and electrical integrity periodically or prior to the winter or p...
System checks depend on the system installed, constant wattage systems can be fully checked for insulation resistance and continuity. Self regulating systems can only be checked for insulation resi...
This is used for a pipe freeze protection application. Electric heat tracing, heat tape or surface heating, is a system used to maintain or raise the temperature of pipes and vessels. Trace heat...