指(zhi)标容(rong)量(liang) kg/m抗(kang)压(ya)强度(du)(du)(du)(du) MPa导热(re)(re)系(xi)数 W/mk <，0.025 抗(kang)压(ya)强度(du)(du)(du)(du) MPa耐热(re)(re)性(xing) ℃ ≤120 表层(ceng)(ceng)硬度(du)(du)(du)(du) MPa <，320耐寒性(xing) ℃ ≥-50 击(ji)穿电压(ya) KV >，25。工(gong)(gong)(gong)作钢(gang)管(guan)(guan)(guan)(guan)：保(bao)(bao)(bao)证输送介质(zhi)(zhi)正常流动。四，施工(gong)(gong)(gong)应(ying)(ying)(ying)(ying)注(zhu)意的(de)事项：1，施工(gong)(gong)(gong)时(shi)(shi)应(ying)(ying)(ying)(ying)避(bi)免(mian)地下(xia)(xia)水(shui)及(ji)(ji)(ji)雨水(shui)的(de)浸泡(pao)(pao)(pao)，若端头(tou)不慎浸水(shui)，连接外套(tao)(tao)前应(ying)(ying)(ying)(ying)做(zuo)干燥处理。管(guan)(guan)(guan)(guan)材(cai)(cai)应(ying)(ying)(ying)(ying)储(chu)存在(zai)(zai)平整的(de)场地，整齐码放(fang)，码放(fang)高度(du)(du)(du)(du)应(ying)(ying)(ying)(ying)小于1.5米(mi)。管(guan)(guan)(guan)(guan)材(cai)(cai)吊(diao)装(zhuang)在(zai)(zai)轻(qing)装(zhuang)轻(qing)放(fang)，禁碰撞(zhuang)，抛掷，禁用(yong)钢(gang)丝(si)绳直(zhi)吊(diao)管(guan)(guan)(guan)(guan)身。保(bao)(bao)(bao)温(wen)层(ceng)(ceng)及(ji)(ji)(ji)防(fang)腐(fu)层(ceng)(ceng)应(ying)(ying)(ying)(ying)避(bi)免(mian)火(huo)焰直(zhi)接接触。 现场安(an)装(zhuang)请按下(xia)(xia)列程序：管(guan)(guan)(guan)(guan)沟开挖(wa)－－基底处理（排水(shui)，垫砂）－下(xia)(xia)管(guan)(guan)(guan)(guan)－－钢(gang)管(guan)(guan)(guan)(guan)焊(han)接－检(jian)验（水(shui)压(ya)）－安(an)装(zhuang)（试压(ya)）－发泡(pao)(pao)(pao)－封(feng)(feng)发泡(pao)(pao)(pao)孔。3弯头(tou)通过补(bu)片或热(re)(re)熔(rong)焊(han)接的(de)方式密(mi)(mi)封(feng)(feng)发泡(pao)(pao)(pao)孔。 （2）热(re)(re)收缩(suo)带(dai) 在(zai)(zai)如下(xia)(xia)三种(zhong)无补(bu)偿敷(fu)设(she)方式中更(geng)能(neng)(neng)显示其优势。冷(leng)(leng)安(an)装(zhuang)方式全(quan)方位焊(han)接管(guan)(guan)(guan)(guan)线时(shi)(shi)的(de)管(guan)(guan)(guan)(guan)道(dao)温(wen)度(du)(du)(du)(du)多于回(hui)填(tian)时(shi)(shi)的(de)环(huan)境温(wen)度(du)(du)(du)(du)。 冷(leng)(leng)安(an)装(zhuang)是(shi)最经济最快捷(jie)的(de)一种(zhong)安(an)装(zhuang)方法(fa)。管(guan)(guan)(guan)(guan)路在(zai)(zai)施工(gong)(gong)(gong)同时(shi)(shi)便(bian)可以及(ji)(ji)(ji)时(shi)(shi)回(hui)填(tian)，因(yin)最大(da)限度(du)(du)(du)(du)地环(huan)比(bi)甚至(zhi)完全(quan)不能(neng)(neng)设(she)置补(bu)偿器(qi)及(ji)(ji)(ji)固定支架(jia)，从(cong)而节约少部分钱。因(yin)为管(guan)(guan)(guan)(guan)道(dao)的(de)轴向应(ying)(ying)(ying)(ying)力增(zeng)多了，所(suo)以有时(shi)(shi)有必要对三通实施进而使处理或普遍(bian)增(zeng)多埋(mai)(mai)设(she)深度(du)(du)(du)(du)。直(zhi)埋(mai)(mai)保(bao)(bao)(bao)温(wen)管(guan)(guan)(guan)(guan)分类别：1，塑(su)套(tao)(tao)钢(gang)保(bao)(bao)(bao)温(wen)管(guan)(guan)(guan)(guan)：塑(su)套(tao)(tao)钢(gang)保(bao)(bao)(bao)温(wen)管(guan)(guan)(guan)(guan)是(shi)由(you)(you)高密(mi)(mi)度(du)(du)(du)(du)聚(ju)乙烯外套(tao)(tao)管(guan)(guan)(guan)(guan)，聚(ju)氨(an)(an)酯泡(pao)(pao)(pao)沫保(bao)(bao)(bao)温(wen)层(ceng)(ceng)及(ji)(ji)(ji)内(nei)工(gong)(gong)(gong)作钢(gang)管(guan)(guan)(guan)(guan)紧密(mi)(mi)结合而成。2，钢(gang)套(tao)(tao)钢(gang)保(bao)(bao)(bao)温(wen)管(guan)(guan)(guan)(guan)：钢(gang)套(tao)(tao)钢(gang)保(bao)(bao)(bao)温(wen)管(guan)(guan)(guan)(guan)是(shi)由(you)(you)外护钢(gang)管(guan)(guan)(guan)(guan)加(jia)钢(gang)管(guan)(guan)(guan)(guan)防(fang)腐(fu)，聚(ju)氨(an)(an)酯泡(pao)(pao)(pao)沫保(bao)(bao)(bao)温(wen)层(ceng)(ceng)及(ji)(ji)(ji)内(nei)工(gong)(gong)(gong)作钢(gang)管(guan)(guan)(guan)(guan)组(zu)合而成。在(zai)(zai)采用(yong)热(re)(re)收缩(suo)带(dai)的(de)接头(tou)方式中，热(re)(re)收缩(suo)带(dai)是(shi)有关(guan)于接头(tou)寿命和密(mi)(mi)封(feng)(feng)性(xing)起到至(zhi)关(guan)重要与特质(zhi)(zhi)材(cai)(cai)料。（3）电熔(rong)套(tao)(tao)筒(tong)，此(ci)(ci)种(zhong)焊(han)接方式采用(yong)预(yu)(yu)埋(mai)(mai)电阻丝(si)的(de)套(tao)(tao)筒(tong)，用(yong)带(dai)把热(re)(re)熔(rong)捆在(zai)(zai)外套(tao)(tao)管(guan)(guan)(guan)(guan)上，再之后接通电源(yuan)开始焊(han)接，焊(han)接时(shi)(shi)间(jian)为预(yu)(yu)先设(she)定，自(zi)动断电后结束焊(han)接，在(zai)(zai)套(tao)(tao)管(guan)(guan)(guan)(guan)完全(quan)冷(leng)(leng)却后卸下(xia)(xia)绑带(dai)。采用(yong)此(ci)(ci)种(zhong)方式接头(tou)，施工(gong)(gong)(gong)简便(bian)，焊(han)口牢固。安(an)装(zhuang)方式此(ci)(ci)管(guan)(guan)(guan)(guan)路系(xi)统在(zai)(zai)所(suo)有已知的(de)直(zhi)埋(mai)(mai)管(guan)(guan)(guan)(guan)路系(xi)统的(de)安(an)装(zhuang)方式上都(dou)能(neng)(neng)够应(ying)(ying)(ying)(ying)用(yong)。除一般(ban)的(de)有补(bu)偿敷(fu)设(she)方式外。yt008黄夹克(ke)聚(ju)氨(an)(an)酯保(bao)(bao)(bao)温(wen)管(guan)(guan)(guan)(guan)的(de)明显优势1.环(huan)比(bi)降(jiang)(jiang)低工(gong)(gong)(gong)程造(zao)价。据有关(guan)部门测算(suan)，双管(guan)(guan)(guan)(guan)制(zhi)供(gong)热(re)(re)管(guan)(guan)(guan)(guan)道(dao)，基本上可以环(huan)比(bi)降(jiang)(jiang)低工(gong)(gong)(gong)程造(zao)价的(de)25％（采用(yong)玻璃钢(gang)做(zuo)保(bao)(bao)(bao)护层(ceng)(ceng)）和10％（采用(yong)高密(mi)(mi)度(du)(du)(du)(du)聚(ju)乙烯做(zuo)保(bao)(bao)(bao)护层(ceng)(ceng)）左右。2.热(re)(re)损耗低，节约能(neng)(neng)源(yuan)。45%抗(kang)压(ya)强度(du)(du)(du)(du) KPa ≥200 氨(an)(an)凝 KPa吸水(shui)率 kg/m2 ≤0.2 使用(yong)年限 30-50年预(yu)(yu)制(zhi)直(zhi)埋(mai)(mai)管(guan)(guan)(guan)(guan)的(de)应(ying)(ying)(ying)(ying)用(yong)：预(yu)(yu)制(zhi)直(zhi)埋(mai)(mai)管(guan)(guan)(guan)(guan)适合输送在(zai)(zai)-50℃—150℃范围内(nei)的(de)各种(zhong)介质(zhi)(zhi)的(de)保(bao)(bao)(bao)温(wen)保(bao)(bao)(bao)冷(leng)(leng)工(gong)(gong)(gong)程。聚(ju)氨(an)(an)酯直(zhi)埋(mai)(mai)保(bao)(bao)(bao)温(wen)管(guan)(guan)(guan)(guan)的(de)明显特点。

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