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Longline (HTP3F)

Products > Series (Longline) Heaters > Longline (HTP3F)

Product Features


Longline (HTP3F) is a series resistance, three phase constant power heating cable used for freeze protection or process temperature maintenance of moderately long pipelines up to 2km. A typical application is the freeze protection of above ground water pipelines.

Longline (HTP3F) minimises the number of electrical supplies needed and so minimises supply cabling and distribution equipment costs. Circuits are often fed at the pipe ends only.
Heating conductors are sized to produce the desired heat output for the circuit length required. The Longline (HTP3F) heating cables are connected directly to the 3 phase mains voltage or to a step-up transformer.
The large heated surface of Longline (HTP3F)’s flat foil construction results in lower operating temperatures than equivalent round conductor constructions thereby improving safety and system life. The high efficiency produces high power capability up to 23W/m for each cable.
Longline (HTP3F) heating cable may be straight traced or spiral traced to above ground pipes. For buried lines, cables are usually drawn into channel raceways within a pre-insulated pipeline system. The installation of Longline (HTP3F) is quick and simple and requires no special tools. See Product, Application and Documentation Links below.



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Product Specification

Maximum Withstand Temperature 135°C (275°F)


Longline (HTP3F) is available in outputs upto 23 W/m as illustrated on the graph to the right.  The graph shows the nominal power output at 480V 3 phase, 1500 metre long pipe with 3 x 4mm² conductors, when installed on insulated metal pipes.  The output of the cable is varied by changing the voltage or the size of the conductors.  Click on the graph to see a larger version.

  Maximum Withstand Temperature 125°C (257°F)
  Power Supply Upto 600V 3 phase
  Cable Dimensions 27.0 x 9.0 mm
  Click on the graph to see a larger version.
Nominal power output  against pipe temperature


  Minimum Installation Temperature -40°C (-40°F)
  Minimum Bending Radius 75mm (16mm² Foil)
  Weight kg/100m 65 kg (16mm² Foil)


Maximum Workpiece Temperatures (°C)
Heater Nominal Output (W/m) T6 T5 T4 T3 T2 T1 Safe
   10 - - - - - - 100
   15 - - - - - - 85
   23 - - - - - - 70
Surface temperature limits in acordance with EN50014.
Approvals and Certification
HTP3F 1495802
Product and Application Datasheets
HTP3F Datasheet

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