Key Features

Carrier Pipe Dimension Temp Range Max Alarm System Operating Pressure Diffusion Barrier Series of Insulation Thickness  Lambda Value
 Conti  DN20 to DN250  0°C to 150°C  Yes  25 bar  Yes  1,2 & 3  0.023 W/mK
 Traditional  DN20 to DN250   0°C to 150°C  Yes  25 bar  Yes

1,2 & 3

 0.027 W/mK

Description of Twin Steel Pipe

Vital Energi's twin steel pre-insulated pipes are suitable for district heating and district cooling applications. They can be supplied with or without Aluminium Diffusion barriers. They are constructed of a carbon steel service pipe, polyurethane (PUR) foam insulation and High Density Polyethylene (HDPE) outercasing. The Twin steel pipe system is a bonded system manufactured according to BS EN253, this means the steel carrier pipe, insulation and outer casing are moulded together to form a solid unit. Thus, the expansion movements of the steel carrier pipe will be transferred to the outer casing via the foam insulation.

The twin steel pre-insulated pipes are available in three insulation thicknesses Series 1 & 2 and 3 are manufactured in 6 and 12m and 16m lengths as standard. The pipes are supplied with two copper wires imbedded in the polyurethane (PUR) insulation; these wires are used to identify any leaks in the system.

In Traditional manufactured TwinPipes the polyurethane (PUR) insulation has a guaranteed lambda value of 0.027 W/mK.

In Conti manufactured TwinPipes the polyurethane (PUR) insulation has a guaranteed lambda value of 0.023 W/mK.

Vital Energi Traditional Twin steel pre-insulated pipes are available in carrier pipe sizes from O/D 26.9mm to 250mm.

Applications of Twin Steel Pre-insulated Pipes:

  • Low Temperature Hot Water (LTHW)
  • Medium Temperature Hot Water (MTHW)
  • Cooling

The general advantages of Twin Steel Pipe systems:

  • Reduction in the number of joints needed through the availability of long lengths
  • Reduction in the number of joints needed through single outer casing
  • Reduction in the number of bends/fittings needed as the piping can be factory curved to follow the best and easiest path
  • Reduced operating costs due to diffusion barrier being fitted
  • Fully welded system
  • Alarm System
  • No-dig methods (Thrust boring) can be applied
  • Fully compliant with CIBSE  CHPA Heat Networks Code of Practice