VeLL heat tracing system is designed for temperature maintenance and freeze protection of long and extra-long pipelines in hazardous and non-hazardous areas.
VeLL heat tracing system is based on special series-resistance heating cables, offering a cost-saving solution for a wide variety of heat-tracing applications:
Cables are installed in a linear way on the pipe surface. In case of pre-insulated pipeline fragments, the cable is usually laid in conduits, which are on the pipe under thermal insulation.
At the end of a heating segment cables are connected together in star (Y). At start of the segment voltage is applied between cables. Its value depends on the pipeline length and necessary power output.
This is a specially designed conductor, resistant to high voltage up to 8 kV and thermal loads in operation up to +100 °C (VLL-A) or +200 °C (VLL-C), also resistant to mechanical impact during installation or maintenance. The cable supplied on drums with length, convenient for installation and connection on site.
| VLL-A | VLL-C | |
| Rated voltage | Up to 8 000 VAC | Up to 8 000 VAC |
| Maximum continuous operating temperature (trace heater energized) | Up to +100 °C | Up to +200 °C |
| Maximum intermittent temperature (trace heater de-energized) | Up to +120 °C | Up to +250 °C |
| Ambient temperature range | −60…+55 °С | −60…+55 °С |
| Minimum installation temperature | −60 °С | −60 °С |
| Conductive wire material | Aluminium | Copper |
| Linear power output per one segment, connected in star | Up to 30 W/m (average value, depends on application) | Up to 30 W/m (average value, depends on application) |
