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TF Heating Cable

Parallel circuit – Constant watt for frost protection and temperature maintenance

TF Heating Cable – Data Sheet

 

>> Parallel circuit heating tape is designed to be cut from reel lengths and site terminated to suit pipework. The heating tape consists of a number of short heating zones, each connected across a pair of continuous bus-wire conductors.

Each complete heating zone will give its full rated design output with circuit voltage applied to the bus-wire conductors.

Construction

The heating tape has a core comprising two bus-wire conductors contained within an extruded silicone rubber sheath. The sheath is notched on alternate sides at predetermined intervals to expose a short section of bus-wire conductor.

Nickel-chrome resistance wire is wrapped at regular spacing around the core as a continuous conductor, making contact with the bus-wires at the exposed points.

After completion of the heater conductor wrapping, a high temperature soldered joint is made at each contact point ensuring that a number of conductor strands are securely bonded to the bus-wires.

An extruded FEP outer sheath is then placed over the core and heater element to complete the heater tape assembly.

For certain applications a heating tape may have a tinned copper or stainless steel braided outer cover.

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heating-cable-tf

Range
Type Volts Watt/m Heater zone length (m) Max circuit length (m) Max recomm. pipe temp ºC
TF 12 240 12 1,0 187 175
TF 20 240 20 1,0 132 145
TF 38 240 38 0,5 98 90

 

Specification
Conductors Copper stranded flexible 30/0,25mm (1,5mm²)
Core Silicone rubber
Heater element Nickel-chrome 80-20
Solder High melting point 296°C
Outer sheath FEP
Thickness 3,9mm
Heater zone 0,5 or 1m according to design output
Braid Stainless steel / Tinned copper
Temperature range Min. -60°C to 205°C
Standard To BS 6351 Grade 2,2
Width 8,2mm
Electrical

tf-electrical

 

Rated Voltage – 220V/240V or 110V/120V AC/DC. Heater Zone (according to design) – 0,5/1,0m.

A 30mA trip Residual Current Circuit Device (RCCB) or Earth Leakage Circuit Breaker (ELCB) is recommended for use with heating tapes.

Heat losses

To calculate heat loss per meter of pipe:

Heat lossesW/m = ∆tx kexLoss factor

∆t= Pipe temp. – Ambient temp.
ke = Thermalconductivity.

Pipe NB (mm) Thermal insulation thickness (mm)
25 38 50
13 5,16 4,13 3,58
25 6,91 5,36 4,56
38 8,74 6,63 5,54
50 10,28 7,69 6,36
75 13,90 10,15 8,24
100 17,08 12,30 9,88
150 23,82 16,82 13,30

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 Heatloss.
A further design factor of 10% may be added.

IHP works together with many leading industrial companies in Europe. As a partner and supplier, we are known for our flexibility and our high quality products and services. IHP has a business valued model and creates successful long-term relationships.

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