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To make lengths of HDPE pipe, polyethylene raw material is dried, heated to ~180 °C (356 °F), and extruded through a die. Polyethylene pipe is usually black due to the addition of 3-5% of carbon black to the clear polyethylene material, which adds UV light resistance to the finished pipe. To create striped HDPE pipe a different die is used ...
any fitting that connects pipes of different materials, including: [5] [6] [7] expansion adapters which have a flexible section to absorb expansion or contraction from two dissimilar pipe materials [8] mechanical joint (MJ) adapters for joining polyethylene pipe to another material [9]: 349
Pipes are extruded and are generally available in: 3 m (9.84 ft), 4 m (13.12 ft), 5 m (16.40 ft), and 6 m (19.69 ft) straight lengths and 25 m (82.02 ft), 50 m (164.04 ft), 100 m (328.08 ft), and 200 m (656.17 ft) coils for LDPE and HDPE. Pipe fittings are moulded and come in many sizes: tee 90° equal (straight and reducing), tee 45°, cross ...
A cross-linked polyethylene (PEX) pipe. Cross-linked polyethylene, commonly abbreviated PEX, XPE or XLPE, is a form of polyethylene with cross-links.It is used predominantly in building services pipework systems, hydronic radiant heating and cooling systems, domestic water piping, insulation for high tension (high voltage) electrical cables, and baby play mats.
Pipe Surface Alignment: A change in the pipe outside diameter (O.D.) surface misalignment of more than 10 percent of the wall thickness of the thinner member to be fused. (3) PE Material: Each lot of polyethylene source material to be used in production (XXVI–2310(c)). (4) Wall Thickness: Each thickness to be fused in production (XXVI–2310(c)).
Adaptor plates that match the outside diameter of the main pipe are applied to the heating plate to perform this type of fusion. [8] Another method used is referred to as electrofusion. Electrofusion is a method of joining HDPE and other plastic pipes with special fittings that have built-in resistive wire which is used to weld the joint ...