PE电力管DN315-DN710规格与壁厚详表
PE管施工安装注意事项
一、管槽开挖
PE管的管槽宜直线开挖，沟底开挖宽度为DN0.30m。管道地下连接时，接口处的槽底宽度应适当增加，管道的槽底宽度不应小于DN0.50m，以便安装和对接。
管道顶部的覆盖深度应满足以下要求：
(1) 埋在巷道下，不应小于0.80米。
(2) 埋在人行道下，不应小于0.60米。
当穿越巷道达不到设计深度时，应铺设钢套管进行保护。
管道沟槽需要转弯时，转弯角度不宜过大，弯曲半径应符合以下要求：PE管路的允许弯曲半径为D/10000至D/500；D>160mm, D/500至D/250；D>250mm, D/250至D/75；D>750mm, D/75及以上。如有起伏，但需支撑平稳，如有凿痕需回填夯实。
二、Pipe Fittings and Connections
P-pipe adopts heat fusion connections and electrofusion connections.The main steps of heat fusion connection are as follows:
1.Material preparation: The company should place the pipe or fitting on a platform position and on an adapter machine, with a residual length of 10-20 millimeters.
2.Fixation: According to the welding pipe or fitting selected suitable sliding fixture, fix the pipe for preparing cutting.
3.Cutting: Cut off impurities and oxidation layer from both ends of welding pipes or fittings to ensure that two connecting ends are flat, smooth without any impurities.
4.Alignment: The two welding pipes' ends should be aligned centrally with minimal mismatch error not exceeding 10% wall thickness otherwise affecting connection quality.
5.Heating: Connecting temperature is generally between 210-230 degrees Celsius in winter and summer heating plates have different heating times for each end; take out heated plates after one minute to make two hot fusion ends stick together under pressure.
Three、Installation Construction
1.Before installing P-pipe check if trench meets installation requirements then examine if there's any depression crack wear scratches on its surface replace it immediately upon finding defects.
2.Prior to installing P-pipe inspect its appearance for depression cracks wear scratches replacing it right away when you find defects during inspection install P-pipes with bends tees reducers etc using C20 concrete bridges concrete bridges for valves install brick bridges around flanges use steel plastic transition adapters or flange connections where P-pipes meet metal pipes valves reducers etc connect them using steel plastic transition adapters flange connections respectively.
Four、Additional Considerations
Due to the flexibility and expandability of PE pipelines no expansion joints need be considered during pipeline installation.
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