The choice of materials for the carrier pipe depends largely on the type of medium transported, and the operating temperatures and pressures. For example, carrier pipes can be made of the following materials:
- stainless steel
- acid-resistant steel
- polypropylene (PPR)
- polybutene (PB)
- cast iron
The choice of a suitable material for the casing of pre-insulated pipes is largely dependent on the planned installation site, e.g.:
- polyethylene for underground applications or even above-ground applications if special joints are used
- zinc-coated steel, stainless steel or aluminium spiral-wound superimposed sheets for above-ground distribution
- polyethylene-coated steel pipes for trenchless routing for demanding applications
The polyurethane insulation used is intended for continuous operating temperatures from -196°C up to +142°C (150°C on a short-term basis). Alternatively, for higher operating temperatures, we are able to supply pipes with polyurethane foam insulation with an increased thermal resistance of up to 165°C. Uponor Infra Fintherm only uses foam blown with cyclopentane (CFC-free). This modern technology for high-pressure foam injection ensures low heat loss with pre-insulated pipes.
Wehotherm® pre-insulated pipeline systems are supplied with Nordic detection wires compliant with EN 14 419 as standard. We can supply pipeline systems with other types of detection wires on request (e.g. Brandes, Hagenuk, Isotronic).
Pre-insulated pipes can be fitted with a protective conduit for heating cables which are installed in the pipes during assembly. Heating cables protect the media flowing through the pipe against freezing, e.g. potable and waste water in shallow-buried pipes or pipes installed on bridges. Less commonly, heating cables can be used to heat media in order to increase their viscosity.