Design of plastic jacket pipes
District heating pipes are prefabricated pressure pipes with fittings that consist of a metallic inner pipe (the medium pipe), a heat insulation layer (or layer for insulation against the cold) made of polyurethane (PUR) foam and a plastic jacket pipe made, for example, of PE. Due to the high pressure and heat-resistance required, the medium pipe is produced mainly from PE-Xa, polybutylene or steel. Normal medium pipe dimensions range from 15 to 1200 DN. The jacket pipes can have diameters of up to 2,000 mm.
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