“The pipes with the red cap!” and their characteristics:

• Suitable for use both below and above ground
• Suitable for use in all types of soil
• Testable at any time
• Usable under any operating conditions
• Safe in case of flooding
• Usable for any media as the material of the inner pipe can be adapted
• FW STEEL-CASED PIPE-IN-PIPE is operated with vacuum in the ring space because:
  – thermal losses are reduced by up to 50%
  – the tightness of the system is permanently controlled
  – by the removal of oxygen and humidity the external side of the inner pipe and
  the interal side of the encasing pipe is permanently protected from corrosion.
• Equipped with cathodic corrosion protection (where electrical ground resistance is ≤ 10,000 Ohm cm)
• Offers a high degree of prefabrication. All fittings such as elbows, anchors, watertight wall ducts, axial compensator end seals, T-junctions, reductions, pipe bearings, compensators, etc. are installed in or on the 12 – 16 metre long construction units at the factory.
• Both the encasing and the inner pipe are welded so as to be pressure-resistant and vacuum-tight
• FW STEEL-CASED PIPE-IN-PIPE- anchors do not need concrete foundations
• The steel-cased pipe-in-pipe, firmly installed in the ground, absorbs soil and traffic loads; the inner pipe is free to expand when exposed to heating
• Inner pipes can be thermally pre-stressed against the encasing pipe; this enables long routes to be built without compensators