Twin Steel Pre-Insulated Pipes

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 per-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.

Solution detail
Carrier PipeDimensionTemp Range MaxLeak Detection SystemOperating PressureDiffusion BarrierSeries of Insulation ThicknessLambda Value
ContiDN20 to DN2500°C to 150°CYes25 barYes1,2 & 30.023 W/mK
TraditionalDN20 to DN2500°C to 150°CYes25 barYes

1,2 & 3

0.027 W/mK

Applications Of Traditional Single Steel

  • low-temperature
    Low Temperature Hot Water (LTHW)
  • medium temperature
    Medium Temperature Hot Water (MTHW)
  • cooling

Key Benefits

  • 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
  • Leak Detection System
  • No-dig methods (Thrust boring) can be applied
  • Fully compliant with CIBSE  CHPA Heat Networks Code of Practice
  • Request Twin Steel Pre-Insulated Pipes document