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直埋蒸汽保温管道保温结构尺寸表软质保温结构尺寸表：工作钢管公称直径工作钢管Ф×δ外护钢管Ф×δ玻璃棉保温层厚度空气层厚度外径壁厚外径壁厚DN50573.52195.040.036.0DN65764.02195.040.026.5DN80894.02195.040.020.0DN1001085.02736.050.026.5DN1251335.02736.050.014.0DN1501595.03257.060.016.0DN2002196.04268.080.015.5DN2502737.05299.0100.019.0DN3003257.06309.0120.023.5DN3503779.06609.0120.012.5DN4004269.07209.0120.018.0DN4504789.08209.0140.022.0DN5005309.092010.0160.025.0DN60063010.0102010.0160.025.0DN70072010.0112010.0170.020.0DN80082012.0122010.0170.020.0硬质保温结构尺寸表：工作钢管公称直径工作钢管Ф×δ外护钢管Ф×δ保温瓦块厚度聚氨酯保温厚度外径壁厚外径壁厚DN50573.52195.030mm*222.0DN65764.02735.030mm*228.5DN80894.02735.030mm*222.0DN1001085.03256.035mm*227.5DN1251335.03256.035mm*215.0DN1501595.03776.035mm*228.0DN2002196.04266.035mm*222.5DN2502737.05296.045mm*227.0DN3003257.06307.050mm*240.5DN3503779.06607.050mm*229.5DN4004269.07207.050mm*235.0DN4504789.08208.060mm*238.0DN5005309.09208.070mm*242.0DN60063010.010208.070mm*242.0DN70072010.011209.070mm*246.0DN80082012.0122010.070mm*245.0编制说明：本表按以下工况：蒸汽温度250℃土壤导热系数λ为1.5W/(m.K)高温玻璃棉导热系数λ为0.055W/(m.K)无机材料硅钙瓦导热系数λ为0.058W/(m.K)聚氨酯泡沫塑料导热系数λ为0.033W/(m.K)最热月地表平均温度20℃，管道中心埋深1.5m工作钢管采用输送流体用无缝钢管，外护钢管采用螺旋缝埋弧焊钢管
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