Electro-Therm Products Heating Cables – Electric Heat Tracing Heating Cables – Longline (Long Distance) Longline LLR-HV Heating Cables – Tmax 230 °C – Length up to 60 km

Longline LLR-HV Heating Cables – Tmax 230 °C – Length up to 60 km

The Longline Round (LLR-HV) is a series resistance, constant wattage heating cable designed for freeze protection or temperature maintenance of long pipelines.

It is used where circuit lengths exceed the capability of parallel resistance self-regulating or constant wattage heating cables, thereby reducing the number of power supply points required. Circuit lengths of several kilometres can be energized from a single feed point.

LLR-HV heating cable delivers a constant power output per meter, with no voltage drop along its entire length. It can be connected in either single-phase or three-phase configuration.

Its continuous metallic sheath provides high mechanical strength, reducing the risk of damage, and offers superior fire resistance compared to most other heating cables.

LLR-HV heating cable is certified according to international standards ATEX, IEC, and CE, ensuring safe use in both non-hazardous and hazardous areas.

Please contact us for any specific requirements.

Technical information

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The LLR-HV long-distance heating cable provides reliable temperature maintenance and freeze protection for pipelines over ultra-long distances.
With circuit lengths of up to 60 km, it delivers constant power output with no voltage drop, while ensuring superior mechanical strength and fire resistance thanks to its continuous metallic sheath.

Technical Specifications – Maximum Allowable Exposure Temperature: 230 °C

The Longline R (LLR-HV) heating cable is available in various power outputs, up to 60 W/m per cable.

Maximum Allowable Exposure Temperature (de-energized)	230°C
Minimum Installation Temperature	-40°C
Minimum Operating Temperature	-60°C
Rated Voltage	Up to 10 kV three-phase
Cable Dimensions	Please see the datasheet for further details.
Minimum Bending Radius	Please see the datasheet for further details.

Maximum maintainable equipment temperatures (°C):"

Refer to datasheet for further details.
Surface temperature limits in accordance with EN 50014

Longline Round Heating Cable (LLR-HV)

The Longline Round (LLR-HV) heating cable is designed for temperature maintenance or freeze protection of very long pipelines.

Application example:
In refineries, power plants, chemical facilities, or for cross-country pipelines, certain buried or above-ground lines can extend over several tens of kilometres and require highly reliable temperature maintenance.

Problem example:
Constant heat losses demand high power output, while power supply is typically only available at the ends of the pipeline. Adding multiple power feed points is costly. Failure of a single circuit can render the entire pipeline inoperative, creating a critical need for reliability and durability.

The solution – LLR-HV
The LLR-HV (Longline Round High Voltage) heating cable enables pipelines of up to 50 km to be heated from a single power supply. With its star conductor configuration and extruded aluminium sheath, it delivers adjustable power output, excellent thermal efficiency, and long-term reliability — ideal for buried or above-ground pipelines over very long distances.