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高密度聚乙烯双壁波纹管（以下简称ＨＤＰＥ波纹管）由聚乙烯材料经高温高压用精密的模具压制而成 ,其外壁呈环形波纹状结构 ,内壁致密光滑 ,中间空腹 ,致使管材总体质轻而强度高。该管内壁粗糙系数ｎ仅０．００９（水泥管粗糙系数ｎ＝０．０１３） ,故水力学性能好 ,在同样环?
High-density polyethylene double-wall corrugated pipe (hereinafter referred to as HDPE corrugated pipe) by the high temperature and high pressure polyethylene materials by precision molds made of its outer wall was annular corrugated structure, dense and smooth inner wall, the middle fasting, resulting in overall light pipe And high strength. The pipe wall roughness coefficient n is only 0.009 (cement pipe roughness coefficient n = 0.013), so the hydraulic properties are good, in the same ring?