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在國外已經有一套完整的生產技術，使用壽命也得到人們的關注，三層結構聚乙烯防腐層(3pe)zonghelerongjiehuanyangfenmotucenghejiyajuyixiliangzhongfangfucengdeyouliangxingzhi，jiangrongjiehuanyangfenmotucengdejiemiantexinghenaihuaxuetexing，yujiyajuyixifangfucengdejixiebaohutexingdengyoudianjieheqilai，congerxianzhugaishanlegezidexingneng。yincizuoweimaidiguanxiandewaifanghucengshifeichangyouyuede。juyouguanziliaojieshao，sancengpe可使埋地管道的壽命達到50年，目前，在國際上被認為是最先進的管道外防腐技術。在我國，三層pe已率先在石油天然氣係統得到應用。我國已建成的陝京天然氣管道及庫鄯輸油管道，最近國家重點工程西氣東輸近4000公裏管道均采用了三層pe外防腐塗層。
外壁采用熱熔結纏繞工藝底層環氧樹脂、中間層膠黏劑、外層聚乙烯形成三層結構的防腐層，內壁采用熱噴塗環氧粉末防腐方式TPEPfangfugangguan，jiangfenmojinggaowenjiarerongjiehoujunyunditufuzaiguantibiaomianshang。jidatigaoletucengfuzhelijitucenghoudu，zengqianglenaikepeng，naifushidenengli。keyijinxing2PE、3PE、內外塗熱熔環氧、內環氧外PE/2PE/3PE等產品的生產，且內外塗的產品均可以實現同時塗敷和固化，一次性成膜。該產品於2009年獲取國家實用新型專利。
聚乙烯三層結構防護層又稱三層PE(3PE)，是近幾年從國外引進的先進的防腐技術。它的全稱為熔結環氧/擠塑聚乙烯結構防護層，結構由以下三層組成：3PE防腐鋼管二底層為熔結環氧(≥80μm);中間層為膠粘劑250μm);麵層為擠塑聚乙烯(約2mm)。防護層總厚度約1.8-3.7mm。
在三層結構中，熔結環氧粉末塗層的主要作用是：形成連續的塗膜，與鋼管表麵直接粘結，具有很好的耐化學腐蝕性和抗陰極剝離性能；yuzhongjiancengjiaozhanjidehuoxingjituanfanyingxingchenghuaxuezhanjie，baozhengzhengtifangfucengzaijiaogaowenduxiajuyoulianghaodezhanjiexing。zhongjiancengtongchangweigongjuwuzhanjieji，qizhuyaochengfenshijuxiting，muqianguangfancaiyongdeshiyixijigongjuwujiaozhanji。gongjuwujiaozhanjidejixingbufenguannengtuanyurongjiehuanyangfenmotucengdehuanyangjituankeyifanyingshengchengqingjianhuohuaxuejian，shizhongjiancengyudicengxingchenglianghaodezhanjie；erfeijixingdeyixibufenyumiancengjuyixijuyouhenhaodeqinhezuoyong，suoyizhongjiancengyumiancengyejuyouhenhaodezhanjiexingneng。juyiximiancengdezhuyaozuoyongshiqijixiebaohuyufangfuzuoyong，yuchuantongdeercengjiegoujuyixifangfucengjuyoutongyangdezuoyong。3PE防腐鋼管三三層結構聚乙烯防腐層(3PE)綜zong合he了le熔rong結jie環huan氧yang粉fen末mo塗tu層ceng和he擠ji壓ya聚ju乙yi烯xi兩liang種zhong防fang腐fu層ceng的de優you良liang性xing質zhi，將jiang熔rong結jie環huan氧yang粉fen末mo塗tu層ceng的de界jie麵mian特te性xing和he耐nai化hua學xue特te性xing，與yu擠ji壓ya聚ju乙yi烯xi防fang腐fu層ceng的de機ji械xie保bao護hu特te性xing等deng優you點dian結jie合he起qi來lai，從cong而er顯xian著zhu改gai善shan了le各ge自zi的de性xing能neng。因yin此ci作zuo為wei埋mai地di管guan線xian的de外wai防fang護hu層ceng是shi非fei常chang優you越yue的de。