大(da)口径(jing)蒸汽保(bao)(bao)(bao)温(wen)(wen)(wen)(wen)(wen)(wen)钢管(guan)(guan)直(zhi)埋敷设与(yu)架空(kong)、地(di)(di)(di)沟敷设传(chuan)(chuan)热(re)(re)状(zhuang)态(tai)不(bu)同，架空(kong)敷设是向(xiang)无限空(kong)间(jian)传(chuan)(chuan)热(re)(re)，地(di)(di)(di)沟敷设是热(re)(re)介(jie)质(zhi)通过(guo)(guo)保(bao)(bao)(bao)温(wen)(wen)(wen)(wen)(wen)(wen)材料(liao)、流动(dong)空(kong)气层(ceng)、沟壁等以不(bu)同传(chuan)(chuan)热(re)(re)状(zhuang)态(tai)向(xiang)周围土壤传(chuan)(chuan)热(re)(re)，而直(zhi)埋敷设，简(jian)化讲热(re)(re)介(jie)质(zhi)是向(xiang)周围土壤按(an)一(yi)维(wei)稳态(tai)传(chuan)(chuan)热(re)(re)，土壤可视为保(bao)(bao)(bao)温(wen)(wen)(wen)(wen)(wen)(wen)结(jie)构(gou)(gou)一(yi)部(bu)分。以目前国内常用的(de)(de)内滑动(dong)式复合结(jie)构(gou)(gou)蒸汽保(bao)(bao)(bao)温(wen)(wen)(wen)(wen)(wen)(wen)管(guan)(guan)为例，计算(suan)(suan)过(guo)(guo)程(cheng)(cheng)中先应(ying)划定三(san)(san)个界(jie)面温(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)。无机(ji)(ji)(ji)保(bao)(bao)(bao)温(wen)(wen)(wen)(wen)(wen)(wen)材料(liao)与(yu)有(you)机(ji)(ji)(ji)保(bao)(bao)(bao)温(wen)(wen)(wen)(wen)(wen)(wen)材料(liao)接触(chu)处可视为一(yi)界(jie)面，外保(bao)(bao)(bao)护层(ceng)与(yu)土壤接触(chu)处视为第(di)二界(jie)面，地(di)(di)(di)表与(yu)空(kong)气接触(chu)面视为第(di)三(san)(san)界(jie)面。计算(suan)(suan)时(shi)应(ying)先控制(zhi)三(san)(san)个界(jie)面温(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)，一(yi)界(jie)面温(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)控制(zhi)在有(you)机(ji)(ji)(ji)材料(liao)耐温(wen)(wen)(wen)(wen)(wen)(wen)能力以下；第(di)二界(jie)面温(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)应(ying)控制(zhi)保(bao)(bao)(bao)护层(ceng)的(de)(de)防腐(fu)、防水及机(ji)(ji)(ji)械(xie)性能不(bu)遭受(shou)大(da)幅(fu)度(du)(du)衰(shuai)减或(huo)破坏；第(di)三(san)(san)界(jie)面温(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)则(ze)控制(zhi)不(bu)会因界(jie)面温(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)升高而使得管(guan)(guan)道(dao)周围土壤热(re)(re)阻值提高，从而造(zao)成一(yi)、二界(jie)面温(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)升高破坏保(bao)(bao)(bao)温(wen)(wen)(wen)(wen)(wen)(wen)结(jie)构(gou)(gou)。所(suo)以在保(bao)(bao)(bao)温(wen)(wen)(wen)(wen)(wen)(wen)结(jie)构(gou)(gou)计算(suan)(suan)过(guo)(guo)程(cheng)(cheng)中，应(ying)校核当地(di)(di)(di)极(ji)高、极(ji)低(di)环境温(wen)(wen)(wen)(wen)(wen)(wen)度(du)(du)的(de)(de)影响(xiang)，必要时(shi)应(ying)适(shi)当调整保(bao)(bao)(bao)温(wen)(wen)(wen)(wen)(wen)(wen)结(jie)构(gou)(gou)各层(ceng)保(bao)(bao)(bao)温(wen)(wen)(wen)(wen)(wen)(wen)材料(liao)的(de)(de)厚度(du)(du)，以确(que)保(bao)(bao)(bao)保(bao)(bao)(bao)温(wen)(wen)(wen)(wen)(wen)(wen)结(jie)构(gou)(gou)安全。同时(shi)，计算(suan)(suan)过(guo)(guo)程(cheng)(cheng)中不(bu)能简(jian)单地(di)(di)(di)按(an)架空(kong)管(guan)(guan)道(dao)保(bao)(bao)(bao)温(wen)(wen)(wen)(wen)(wen)(wen)结(jie)构(gou)(gou)或(huo)按(an)中公(gong)式进行(xing)计算(suan)(suan)，而应(ying)结(jie)合节能50％，管(guan)(guan)网输(shu)送效(xiao)率提高到大(da)于90％的(de)(de)要求(qiu)。

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