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鋼(gang)套(tao)(tao)鋼(gang)預(yu)制保(bao)溫(wen)(wen)管(guan)(guan)是地下直埋(mai)管(guan)(guan)道中的(de)一種，采用(yong)(yong)沒有(you)混凝土結(jie)構(gou)的(de)情況下也可(ke)(ke)以進行地下直埋(mai)的(de)方式，即工(gong)作(zuo)鋼(gang)管(guan)(guan)的(de)熱(re)(re)(re)膨脹在外管(guan)(guan)內進行，從而降低了(le)材(cai)料(liao)成(cheng)本(ben)，縮短了(le)施(shi)工(gong)日(ri)期，并(bing)保(bao)障了(le)供熱(re)(re)(re)管(guan)(guan)道的(de)安全(quan)(quan)性，可(ke)(ke)以在不(bu)同(tong)溫(wen)(wen)度(du)環境下更(geng)安全(quan)(quan)的(de)廣泛應用(yong)(yong)，尤其(qi)(qi)適用(yong)(yong)于高(gao)溫(wen)(wen)蒸(zheng)汽管(guan)(guan)道項目。使(shi)用(yong)(yong)溫(wen)(wen)度(du)可(ke)(ke)達150℃-450℃。管(guan)(guan)道端口一般選(xuan)用(yong)(yong)聚乙烯薄膜或(huo)三層PE冷(leng)纏帶密封，防(fang)止安裝前或(huo)施(shi)工(gong)中進入潮氣(qi)或(huo)水。保(bao)溫(wen)(wen)材(cai)料(liao)多層錯縫包(bao)扎(zha)，有(you)效(xiao)減少(shao)了(le)熱(re)(re)(re)損失，同(tong)時在外套(tao)(tao)表面采取控制措(cuo)施(shi)，防(fang)止冷(leng)橋的(de)產(chan)生，從而使(shi)外套(tao)(tao)防(fang)腐層的(de)溫(wen)(wen)度(du)控制得到了(le)保(bao)證(zheng)。用(yong)(yong)保(bao)溫(wen)(wen)材(cai)料(liao)包(bao)扎(zha)多層鋁(lv)箔(bo)反射層，有(you)效(xiao)減少(shao)了(le)熱(re)(re)(re)損失，使(shi)蒸(zheng)汽管(guan)(guan)道更(geng)加經(jing)濟合理。疏水系統(tong)采用(yong)(yong)全(quan)(quan)封閉的(de)形(xing)式，布置靈(ling)活，結(jie)構(gou)合理，安全(quan)(quan)可(ke)(ke)靠。鋼(gang)套(tao)(tao)管(guan)(guan)上的(de)排(pai)潮管(guan)(guan)既能及時排(pai)出潮濕氣(qi)體，又可(ke)(ke)作(zuo)為日(ri)常運行的(de)報警信號管(guan)(guan)。管(guan)(guan)道的(de)熱(re)(re)(re)補(bu)償采用(yong)(yong)優(you)質波紋(wen)管(guan)(guan)補(bu)償器(qi)，并(bing)將其(qi)(qi)裝設在套(tao)(tao)管(guan)(guan)內，做成(cheng)直埋(mai)形(xing)式，無(wu)須設置觀(guan)察井，施(shi)工(gong)操作(zuo)方便(bian)、工(gong)期短。適用(yong)(yong)于輸送2.5MPa、350攝(she)氏度(du)以下的(de)蒸(zheng)汽或(huo)其(qi)(qi)它介(jie)質，該產(chan)品用(yong)(yong)鋼(gang)管(guan)(guan)做外防(fang)護層，具有(you)強度(du)高(gao)，不(bu)易損壞，施(shi)工(gong)檢(jian)修簡便(bian)，使(shi)用(yong)(yong)壽命長的(de)優(you)點。