Union Plastic pipe - how to pick plastic pipe

Even plastic pipes plastic composite outer tube usually made on the basis of different uses different colors to distinguish the user, the hot water pipe is usually red, cold water pipe is usually white or blue, natural gas pipeline usually yellow, plastic composite pipe because of their superior performance for a broad range of consumers to bear, but the quality of higher steel prices, it was bound constraints. And there have been many inferior race brewed cheap, shoddy products severe upset to carry plastic composite pipe, aluminum-plastic composite pipe purchase method on the market: 1. First Thoughts lap welding aluminum layer is still the butt welding. 2. brief judgment defective tube and different plastic composite pipe specification Use a knife to cut the plastic outer layer, to observe whether there is adhesion between the outer plastic layer and the aluminum layer. Good plastic composite pipe even if it is difficult to stick with the stuff on the aluminum layer of the plastic strip and clean. 3. Select the plastic composite pipe, we should first think, the plastic layer is polyethylene (XLPE still, if used for cold water pipes system for non-cross-linked plastic pipe, if used in low temperature (≤60 ℃) heating system can be used cross-linked plastic inner tube, but if used in high temperature heating system will be set, then be sure to choose the inner and outer layer of aluminum tubes were crosslinked. www.pzjlsm.com