利华聚氨酯厂

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  地址：河北省廊坊市大城县城西青洲工业区
  电话：0316-5952258 5950397
  手机：13703268259
  厂长：仝健康
  Web：www.cnbaowen.com
  E-mail:lflihua@lf114.com

  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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