架空(kong)保(bao)溫鋼(gang)管采(cai)用單(dan)一絕(jue)熱材(cai)料層或(huo)多種絕(jue)熱材(cai)料的(de)復合層，外(wai)(wai)護管采(cai)用鋼(gang)制外(wai)(wai)護管或(huo)玻璃纖維增強(qiang)塑料外(wai)(wai)護管。架空(kong)保(bao)溫鋼(gang)管從其產生的(de)根源和(he)機理無外(wai)(wai)乎是(shi)從直埋熱水管道和(he)管溝發展衍生而來的(de)兩種形式，大(da)致可分為(wei)內滑動型(xing)和(he)外(wai)(wai)滑動型(xing)。

架(jia)空保溫(wen)鋼(gang)管(guan)(guan)采用內固定結(jie)構(gou)具有(you)很大的優越性(xing)。根據外(wai)護管(guan)(guan)的不(bu)同，又可分為鋼(gang)套鋼(gang)結(jie)構(gou)和鋼(gang)套鋼(gang)復合結(jie)構(gou)。經(jing)過實踐證明，塑套鋼(gang)結(jie)構(gou)已經(jing)不(bu)適應(ying)蒸汽(qi)保溫(wen)管(guan)(guan)的特點(dian)，基本(ben)上被淘汰。外(wai)套管(guan)(guan)與保溫(wen)結(jie)構(gou)層之(zhi)間要留有(you)間隙，起(qi)到進一步的保溫(wen)。

聚(ju)氨(an)酯泡沫層: 確(que)保(bao)(bao)(bao)介質溫(wen)(wen)度，確(que)保(bao)(bao)(bao)外(wai)護(hu)管(guan)外(wai)表(biao)堅持常溫(wen)(wen)。保(bao)(bao)(bao)溫(wen)(wen)管(guan)適用(yong)(yong)于(yu)室內外(wai)各(ge)種管(guan)道(dao)，集中供(gong)(gong)熱(re)管(guan)道(dao)，空(kong)調管(guan)道(dao)、化工(gong)、等工(gong)業管(guan)道(dao)的保(bao)(bao)(bao)溫(wen)(wen)、保(bao)(bao)(bao)冷(leng)工(gong)程。自三十年(nian)代聚(ju)氨(an)酯合成材(cai)料誕生以來，一直(zhi)作(zuo)為一種優良的絕(jue)熱(re)保(bao)(bao)(bao)溫(wen)(wen)材(cai)料而迅速發(fa)展，其(qi)應(ying)用(yong)(yong)范圍也越來越廣泛，由于(yu)其(qi)施工(gong)簡便、節(jie)能防(fang)腐效果顯著而被大量地用(yong)(yong)于(yu)各(ge)種供(gong)(gong)熱(re)為達到長壽命。