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秦皇岛市海港区集中供热主干线采用大口径一次性补偿直埋供热管道。管道直径DN1000～DN500,其中DN1000～DN600采用进口材料ST44,DN500采用国产材料Q235B。两种材料管道都采用螺旋焊管,预制保温。供热管道设计温度:供水135℃,回水70℃。总长度8.6km。
Qinhuangdao Harbor District central heating main line using large-caliber one-time compensation burial heat pipe. Pipe diameter DN1000 ~ DN500, of which DN1000 ~ DN600 imported materials ST44, DN500 using domestic materials Q235B. Both materials are used spiral pipe spiral pipe, prefabricated insulation. Heating pipe design temperature: water supply 135 ℃, return water 70 ℃. The total length of 8.6km.