Among stainless steel screw conveyor manufacturers them, PE, PP and other polyolefins most. On the contrary, PE, PE-X, PB as a "flexible tube" for Concealed.(3) hydraulic performance, pipe, smooth wall, the resistance coefficient is small and difficult to fouling, tube flow area does not change with time, channel blocking probability small. And aluminum-plastic composite pipe, steel pipe, copper pipe, plastic pipe channels the physical properties of the way, use, compensation measures and pipe insulation and so on.(4) relative to the metal pipe, density, light materials, transport, easy to install, flexible, simple and easy maintenance.

 When building a water supply system and hot and cold water pipes when the heat resistance of a uniform as a major target.The main disadvantage of plastic pipe 1) poor mechanical properties, impact resistance, poor, poor rigidity, straight sex was bad, and thus control the density of high cards and hanger.(3) plastic pipe due to thermal expansion coefficient is high, especially in the plastic pipe as a water pipe, with flexible interfaces, expansion joints or bends of various compensation measures such as more heat.(2) small thermal conductivity, low thermal conductivity, thermal insulation, energy-saving effect is good. If this is not the time construction and installation of adequate attention, and to take appropriate technical measures, is extremely vulnerable due to the interface of expansion joints and pull off the problem.

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