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Longline (HTS1F)

Products > Series (Longline) Heaters > Longline (HTS1F)

Product Features

               ATEX - European Hazardous Area Approval

Longline (HTS1F) is a series resistance, single conductor heating cable . It is supplied in multiples of three cables for configuring into a 3 phase heating system. It is used for freeze protection or process temperature maintenance of long pipelines up to 5km, in safe or hazardous areas. A typical application is the temperature maintenance of crude or fuel oils in above ground or buried transfer lines.

Longline (HTS1F) 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.
The number of heating cables and their conductor size is varied to produce the desired heat output for the circuit length required. The Longline (HTS1F) heating cables are connected directly to the 3 phase mains voltage or to a step-up transformer.
The large heated surface of Longline (HTS1F)’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 50W/m for each cable.

Longline (HTS1F) heating cable may be straight traced or spiral traced to above ground pipes. The insulation material is silicone rubber ensuring the cable is very flexible. For buried lines, cables are usually drawn into channel raceways within a pre-insulated pipeline system. The installation of Longline (HTS1F) 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 200°C (392°F)

Longline (HTS1F) is available in outputs upto 50 W/m as illustrated on the graph to the right.  The graph shows the nominal power output at 480V 3 phase, 1000 metre long pipe with 1 x 12mm² conductors, 3 cables, 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

HTS1F-xS 200°C (392°F)
HTS1F-xF 200°C (392°F)

  Maximum Energised Temperature HTS1F-xS 200°C (392°F)
HTS1F-xF 200°C (392°F)
  Minimum Operating Temperature -40ºC (-40ºF)
  Power Supply

Upto 1000V 3 phase


Maximum Conductor Size

16mm² - 60mm²

  Click on the graph to see a larger version.
Nominal power output  against pipe temperature


  Minimum Installation Temperature

-40°C (-40°F)


Maximum Workpiece Temperatures (°C)
Nom Output (W/m) T6 T5 T4 T3 T2 T1 Safe
HTS1F-xS 10 57 73 112 181 200 200 200
   20 37 53 93 166 180 180 180
   30 - 31 73 152 157 157 157
   40 - - 51 127 127 127 127
   50 - - 27 92 92 92 92
HTS1F-xF 10 57 73 112 181 200 200 200
  20 37 53 93 166 180 180 180
  30 - 31 73 152 157 157 157
  40 - - 51 127 127 127 127
  50 - - 27 92 92 92 92
Surface temperature limits in acordance with EN50014.
Approvals and Certification
HTS1F CML 19.0131X
Product and Application Datasheets
HTS1F Datasheet
SK-HTS1F Instructions
TK-HTS1F-50 Instructions
TK-HTS1F-95 Instructions

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