共4個等級。HDPE管(guan)(guan)(guan)在溫(wen)度190℃-240℃之間(jian)將(jiang)被熔(rong)(rong)化(hua)(hua)，農(nong)田PE管(guan)(guan)(guan)件(jian)零售，利用這一(yi)特(te)性，蒙自PE管(guan)(guan)(guan)件(jian)，將(jiang)管(guan)(guan)(guan)材（或(huo)(huo)管(guan)(guan)(guan)件(jian)）兩熔(rong)(rong)化(hua)(hua)的部(bu)分充分接(jie)(jie)觸，凈水PE管(guan)(guan)(guan)件(jian)安裝，并保持(chi)適(shi)當壓力，冷卻(que)后兩者(zhe)便可牢固地融為(wei)一(yi)體。因此， pe管(guan)(guan)(guan)的連(lian)(lian)接(jie)(jie)方式與(yu) u－pvc管(guan)(guan)(guan)不同(tong)，通常采用電熱(re)熔(rong)(rong)連(lian)(lian)接(jie)(jie)及(ji)熱(re)熔(rong)(rong)對接(jie)(jie)兩種方式，按照管(guan)(guan)(guan)徑大小情況(kuang)具體可分為(wei)：dn≤63時，采用注(zhu)塑熱(re)熔(rong)(rong)承(cheng)插(cha)連(lian)(lian)接(jie)(jie)；dn≥75時，采用熱(re)熔(rong)(rong)對接(jie)(jie)連(lian)(lian)接(jie)(jie)或(huo)(huo)電熔(rong)(rong)承(cheng)插(cha)連(lian)(lian)接(jie)(jie)；與(yu)不同(tong)材質連(lian)(lian)接(jie)(jie)時采用法蘭(lan)或(huo)(huo)絲(si)扣連(lian)(lian)接(jie)(jie)。

給(gei)水(shui)(shui)(shui)鑄(zhu)(zhu)(zhu)鐵管(guan)(guan)常用(yong)的(de)連接方(fang)式(shi)有承(cheng)插(cha)連接和法蘭連接。排(pai)(pai)水(shui)(shui)(shui)鑄(zhu)(zhu)(zhu)鐵管(guan)(guan)的(de)接口(kou)形(xing)式(shi)為(wei)承(cheng)插(cha)式(shi)。排(pai)(pai)水(shui)(shui)(shui)鑄(zhu)(zhu)(zhu)鐵管(guan)(guan)較鋼(gang)管(guan)(guan)耐腐蝕，但質脆、自重(zhong)大(da)。排(pai)(pai)水(shui)(shui)(shui)鑄(zhu)(zhu)(zhu)鐵管(guan)(guan)的(de)管(guan)(guan)壁比(bi)給(gei)水(shui)(shui)(shui)鑄(zhu)(zhu)(zhu)鐵管(guan)(guan)的(de)管(guan)(guan)壁薄，不能承(cheng)受較高的(de)壓(ya)力，它常用(yong)于(yu)室內(nei)生活(huo)污水(shui)(shui)(shui)管(guan)(guan)道、雨(yu)水(shui)(shui)(shui)管(guan)(guan)道及(ji)工(gong)(gong)(gong)業(ye)廠房中振動不大(da)的(de)生產排(pai)(pai)水(shui)(shui)(shui)管(guan)(guan)道。但是(shi)，在(zai)新(xin)建的(de)普通建筑(zhu)(zhu)物工(gong)(gong)(gong)程(cheng)中已被塑(su)(su)料排(pai)(pai)水(shui)(shui)(shui)管(guan)(guan)及(ji)其他化(hua)學管(guan)(guan)材所(suo)取代，電容PE管(guan)(guan)件直(zhi)銷(xiao)，而舊建筑(zhu)(zhu)上仍存(cun)在(zai)著大(da)量(liang)的(de)排(pai)(pai)水(shui)(shui)(shui)鑄(zhu)(zhu)(zhu)鐵管(guan)(guan)。塑(su)(su)料管(guan)(guan)及(ji)管(guan)(guan)件塑(su)(su)料管(guan)(guan)材、管(guan)(guan)件具有耐酸、耐堿(jian)、耐腐蝕、不結垢、化(hua)、質量(liang)輕、施工(gong)(gong)(gong)方(fang)便等優點(dian)。

HDPE管(guan)(guan)(guan)(guan)道(dao)(dao)的(de)(de)(de)(de)柔性(xing)(xing)使得它(ta)更容(rong)易彎曲(qu)，工程上(shang)可通過改(gai)變(bian)管(guan)(guan)(guan)(guan)道(dao)(dao)走向的(de)(de)(de)(de)方(fang)式繞過障礙物，在許多場合(he)，管(guan)(guan)(guan)(guan)道(dao)(dao)的(de)(de)(de)(de)柔性(xing)(xing)能夠減少管(guan)(guan)(guan)(guan)件用(yong)量并降(jiang)低(di)安(an)裝(zhuang)費用(yong)。8、水流(liu)阻力(li)小。HDPE具(ju)有(you)光滑(hua)(hua)的(de)(de)(de)(de)內表面(mian)，其(qi)曼寧系數為0.009。光滑(hua)(hua)的(de)(de)(de)(de)表面(mian)和(he)非粘附特性(xing)(xing)保(bao)證HDPE管(guan)(guan)(guan)(guan)道(dao)(dao)具(ju)有(you)較傳(chuan)統管(guan)(guan)(guan)(guan)材更高的(de)(de)(de)(de)輸送(song)能力(li)，同時(shi)也(ye)降(jiang)低(di)了管(guan)(guan)(guan)(guan)路的(de)(de)(de)(de)壓力(li)損失和(he)輸水能耗(hao)。