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  预制保温管整体
        (1)高密度聚乙烯外套管
      在高密度聚乙烯外套管的生产过程中采用蒸气应力释放处理工艺,用于消除在冷却成型过程中产生的内外应力不均衡,提
   高机械性能。
        (2)预制保温管道管端净区长度
      所有尺寸的预制保温管道在生产中都在管端留出150-200mm的净区,以方便现场接头钢管的焊接。
        (3)保温层的平均密度
      预制保温管道保温层平均密度应不小于70Kg/m
        (4)轴向剪切强度
      在23聚氏度的温度下检测,预制保温管道的钢管和保温层之间的轴向剪切强度应不小于200KPa
        (5)外径
      发泡后预制保温管外套管的直径增大率应小于2%。
       (6)对预制保温管道的其它要求
      (1)管端净区和预制保温管道外套管上不应附着任何发泡材料、泡沫或者其它污物
      (2)外套管表面不应有任何明显的划伤
      (3)发泡材料应均匀填充外套管和钢管之间的空间。发泡层不应有明显的空洞。
      (4)外套管和钢管的同轴度

外径(mm)

180-400

450-630

同轴度(mm)

4.5

6.0
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