>> This is a parallel resistance, cut to length on site self-regulating heating tape cable designed for frost protection, process pipework maintaining and hot water temperature maintaining.
The heating tape adjusts heat output to equal the heat loss from the pipe work. As pipe temperature falls under no-flow conditions or due to decreases in external or internal temperature, output increases. As the pipe temperature increases under flow conditions or as a result of increasing external or internal temperature so output decreases.
The heating tape has a core comprising two bus-wire conductors contained within an extruded semi-conductive self-limiting heater core with an outer insulating polyolefin sheath.
The tape has an earth protection screen in the form of a Foil Jacket covering a multi strand earth lead.
The tape is finished with a further protective PFA sheath over the earth screen.
The heating tape is certified for use in hazardous areas.
|Max circuit length (m)|
|16A CB||20A CB|
|Conductors||Copper stranded flexible – 1,23mm²|
|Withstand temp||200ºC Un-energised|
To calculate heat loss per metre of pipe:
Heat losses W/m = Δt x ke x Loss factor
Δt = Pipe temp. – Ambient temp.
ke = Thermal conductivity
|Pipe NB (mm)||Thermal insulation thickness (mm)|
Loss factor (According to BS 6351)
To comply with BS 6351 allowance should be taken of maximum heater resistance tolerance (± 10%) and voltage variation (± 6%) = 1,1/ (0,94)² = 1,25 x Heat loss.
A further design factor of 10% may be added.