給水管是什么
給水用PE管(guan)材是傳統(tong)的鋼(gang)鐵管(guan)材、聚(ju)氯乙烯(xi)飲用水管(guan)的換代產(chan)品。
給水管必須承受一定的(de)壓(ya)力,通常要選用(yong)(yong)分子量大、機械性(xing)能較好的(de)PE樹(shu)(shu)脂(zhi)(zhi),如HDPE樹(shu)(shu)脂(zhi)(zhi)。LDPE樹(shu)(shu)脂(zhi)(zhi)的(de)拉伸強度(du)低,耐壓(ya)差(cha),剛性(xing)差(cha),成(cheng)型(xing)加(jia)工(gong)時尺寸穩定性(xing)差(cha),并且(qie)連接困(kun)難,不適宜作為給(gei)水壓(ya)力管的(de)材料。但由于其(qi)(qi)衛(wei)生指標較高,PE特別是HDPE樹(shu)(shu)脂(zhi)(zhi)已(yi)成(cheng)為生產飲(yin)用(yong)(yong)水管的(de)常用(yong)(yong)材料。HDPE 樹(shu)(shu)脂(zhi)(zhi)的(de)熔(rong)融粘(zhan)度(du)小,流動性(xing)好,易(yi)加(jia)工(gong),因而(er)對其(qi)(qi)熔(rong)體(ti)指數的(de)選擇范(fan)圍也較寬(kuan),通常MI在(zai)0.3-3g/10min之間。
PE給水管規格分類
根據(ju)管(guan)(guan)件的生產(chan)方式分:注射管(guan)(guan)件、焊接管(guan)(guan)件。
根據施工方法與(yu)用途(tu)分類:電熱熔(rong)管件、熱熔(rong)對接(jie)管件、承插管件、鋼塑轉換接(jie)頭。
根據工程(cheng)習慣(guan)分(fen):套筒、彎頭、三通、鞍型三通、變徑、端堵、法蘭(lan)、鋼(gang)塑轉換。
根據PE管從壓(ya)力等級來分(fen)主(zhu)要分(fen)為0.6MPa,0.8MPa,1.0MPa,1.25MPa,1.6MPa,MPa是(shi)(shi)壓(ya)力單位,比如0.6MPa也(ye)就是(shi)(shi)壓(ya)力6公斤的意思。
根據PE管的口徑來(lai)分大(da)體可以分為(wei):20,25,32,40,50,63,75,90,110,125,160,180,200,225,250,280,315,355,400,450,500,560,630,710,800,900,1000,1200,單位都是(shi)mm也(ye)就是(shi)毫米(mi),PE管口徑都是(shi)指外徑,對(dui)應(ying)壓力等級的不同,管材的壁(bi)厚(hou)也(ye)就各(ge)不相同。
PE給水管連接方式
聚乙烯管(guan)(guan)(guan)(guan)材(cai)與管(guan)(guan)(guan)(guan)材(cai)、管(guan)(guan)(guan)(guan)材(cai)與管(guan)(guan)(guan)(guan)件(jian)、管(guan)(guan)(guan)(guan)材(cai)與配件(jian),以及聚乙烯管(guan)(guan)(guan)(guan)與金屬(shu)管(guan)(guan)(guan)(guan)之間(jian)烯管(guan)(guan)(guan)(guan)材(cai)、管(guan)(guan)(guan)(guan)件(jian),直接(jie)(jie)連(lian)(lian)接(jie)(jie)。城鎮(zhen)供水聚乙烯管(guan)(guan)(guan)(guan)道最常用的連(lian)(lian)接(jie)(jie)方(fang)式有(you):熱熔連(lian)(lian)接(jie)(jie)、電熔連(lian)(lian)接(jie)(jie)、承插式柔(rou)性連(lian)(lian)接(jie)(jie)、法蘭連(lian)(lian)接(jie)(jie)、鋼塑過渡(du)接(jie)(jie)頭連(lian)(lian)接(jie)(jie)等。
1、熱熔連接
熱(re)熔(rong)(rong)(rong)連(lian)接(jie)(jie)是用專用加(jia)熱(re)工具,在壓力下加(jia)熱(re)聚(ju)乙烯管材或管件的待(dai)連(lian)接(jie)(jie)部位,使其熔(rong)(rong)(rong)融(rong)后,移走加(jia)熱(re)工具,施壓將兩個熔(rong)(rong)(rong)融(rong)面連(lian)在一起,在穩(wen)定的壓力下保持一段時間(jian),直到(dao)接(jie)(jie)頭冷卻。熱(re)熔(rong)(rong)(rong)連(lian)接(jie)(jie)包括熱(re)熔(rong)(rong)(rong)對接(jie)(jie)連(lian)接(jie)(jie)、熱(re)熔(rong)(rong)(rong)承插連(lian)接(jie)(jie)、熱(re)熔(rong)(rong)(rong)鞍型連(lian)接(jie)(jie)。
2、電熔連接
電(dian)(dian)(dian)熔連(lian)(lian)(lian)接是(shi)用(yong)內埋電(dian)(dian)(dian)阻絲(si)的專用(yong)電(dian)(dian)(dian)熔管(guan)(guan)件(jian)與管(guan)(guan)材或管(guan)(guan)件(jian)的連(lian)(lian)(lian)接部位緊密接觸通電(dian)(dian)(dian),通過內埋的電(dian)(dian)(dian)阻絲(si)加熱連(lian)(lian)(lian)接部位,使其熔融(rong)連(lian)(lian)(lian)為(wei)一體,直(zhi)至接頭冷卻(que)。電(dian)(dian)(dian)熔連(lian)(lian)(lian)接可用(yong)于與不同類型和不同熔體流動速率的聚乙烯管(guan)(guan)材或插口管(guan)(guan)件(jian)連(lian)(lian)(lian)接。電(dian)(dian)(dian)熔連(lian)(lian)(lian)接分(fen)為(wei)電(dian)(dian)(dian)熔承插連(lian)(lian)(lian)接和電(dian)(dian)(dian)熔鞍型連(lian)(lian)(lian)接。
3、承插式柔性連接
聚乙(yi)(yi)(yi)烯管(guan)道承(cheng)(cheng)插式柔(rou)性連(lian)(lian)(lian)接(jie)是參(can)照鑄鐵管(guan)和聚氯乙(yi)(yi)(yi)烯管(guan)(PVC U)的(de)(de)承(cheng)(cheng)插式柔(rou)性連(lian)(lian)(lian)接(jie)原理開(kai)發的(de)(de)一(yi)種新型連(lian)(lian)(lian)接(jie)方(fang)式,它是在聚乙(yi)(yi)(yi)烯管(guan)材(cai)一(yi)端(duan)焊接(jie)一(yi)個經(jing)過加固的(de)(de)聚乙(yi)(yi)(yi)烯承(cheng)(cheng)口(kou)(kou)。承(cheng)(cheng)插式柔(rou)性連(lian)(lian)(lian)接(jie)是將聚乙(yi)(yi)(yi)烯管(guan)材(cai)一(yi)端(duan)直接(jie)插入(ru)管(guan)材(cai)或管(guan)件(jian)的(de)(de)特制的(de)(de)承(cheng)(cheng)口(kou)(kou)中,通過承(cheng)(cheng)口(kou)(kou)內的(de)(de)鎖緊(jin)環壓(ya)緊(jin)抗拉拔、橡膠密(mi)封圈壓(ya)緊(jin)密(mi)封,達到連(lian)(lian)(lian)接(jie)管(guan)材(cai)和管(guan)件(jian)的(de)(de)目的(de)(de)。
4、法蘭連接
法(fa)(fa)(fa)蘭連(lian)(lian)接(jie)主要用于聚乙(yi)(yi)烯(xi)管道(dao)與(yu)金屬管道(dao)或(huo)閥門、流量計、壓力表等附屬設備(bei)的連(lian)(lian)接(jie)。法(fa)(fa)(fa)蘭連(lian)(lian)接(jie)主要由聚乙(yi)(yi)烯(xi)法(fa)(fa)(fa)蘭連(lian)(lian)接(jie)件、鋼制(zhi)(zhi)或(huo)鋁制(zhi)(zhi)背壓活套(tao)法(fa)(fa)(fa)蘭、鋼制(zhi)(zhi)或(huo)鋁制(zhi)(zhi)法(fa)(fa)(fa)蘭片(pian)、墊片(pian)或(huo)密(mi)封圈、螺栓(shuan)、螺母(mu)等組成。法(fa)(fa)(fa)蘭連(lian)(lian)接(jie)是通過緊(jin)固螺栓(shuan)、螺母(mu),使法(fa)(fa)(fa)蘭連(lian)(lian)接(jie)件與(yu)法(fa)(fa)(fa)蘭片(pian)緊(jin)密(mi)接(jie)觸(chu),達到(dao)連(lian)(lian)接(jie)目的。
5、鋼塑過渡接頭連接
鋼(gang)塑過渡接(jie)頭連接(jie)是采用通(tong)過冷壓或其(qi)它方式預制的(de)(de)鋼(gang)塑過渡接(jie)頭來連接(jie)聚乙(yi)(yi)烯(xi)管道和(he)金屬管道。鋼(gang)塑過渡接(jie)頭內有抗拉拔的(de)(de)鎖緊(jin)環(huan)和(he)密(mi)封圈,通(tong)常要求其(qi)有良好的(de)(de)密(mi)封性(xing)能(neng)和(he)抗拉拔、耐壓性(xing)能(neng)要大于系統(tong)中(zhong)聚乙(yi)(yi)烯(xi)管道。