Fengliang Jiang, Nian Wu
Papers # 2018 Las-Vegas
This article discusses the development of the technique in producing large-diameter, medium-and-lowpressure water-delivery pipes. The continuous fiber-reinforced thermoplastic tapes perfectlyimpregnated with thermoplastic resin are wound layer by layer to form three-layer fibre reinforced polyethylene(PE) composite pipe (CGFR-PE) with inner and outer polyethylene layers as the protective functional layer and the middle continuous fiber glass belt as the reinforcing layer. There are stiffening rib designed in the outer layer to be used for bell-and-spigot joint.
The large-diameter (>1000mm) medium and low-pressure (0.4-1.6Mpa) water delivery pipe market is very attractive for plastic pipes. Compared with the traditional thermoplastic solid-wall pipe, the continuous glass fibre reinforced polyethylene(PE) composite pipe (CGFR-PE) has its significant advantages of technical and economic indicators below: Stable and reliable performance, environmental protection and energy saving, high pressure bearing capacity, convenient and reliable socket connection, low production cost and the like, which has a good market prospect in this field. This text introduces the structural design, strength calculation, connection technology, production technology and equipment of the glass fibre reinforced PE pipe, etc. The speciallydesigned multi-station winding device and the socket online finishing device are all our patented technology-friendly products. This will also help greatly improve the production efficiency, and ensure the overall consistent performance of the pipe wall and make the socket connection more reliable. For the reason that it is very difficult to detect the pressure-resistant properties of large-diameter composite pipes by exerting hydrostatic tests. Therefore, this text mainly discusses how to test the 'initial apparent radial strength' and the 'initial apparent axial strength' by means of the 'Split Disc Method' (ASTM D 2290), instead of the traditional hydrostatic test (ISO 4427). This text also explores a test scheme for detecting the long-term reliability of composite pipe by means of the Split Disc Method.