原油长输管道浅埋及低洼段的热能损失较大，采用聚氨酯硬质泡沫保温层效果良好（其保温效率达86.3％）。
Shallow buried and lowland laid pipelines, on account of their greater energy loss, are better to be insulated with hard polyurethane (Its insulation efficiency goes up to 86.3%).
介绍了作为预制直埋保温管保温层的聚氨酯泡沫塑料的特性。
The characteristics of polyurethane foam used as insulating layer of prefabricated directly buried insulating pipe are introduced.
测试结果表明，聚氨酯泡沫保温层具有重量轻、强度高、吸水率低、保温效果好、离火自熄等特点；
It is showed in the test result that polyurethane foam heat-insulation layer has advantages such as weight light, strength high, absorbing water rate low and high heat -insulation effect and so on.
保温层可以是胶粉聚苯颗粒保温层、聚氨酯发泡层、泡沫玻璃、聚苯板等。
The heat insulating layer may be polystyrene particle layer, foamed polyurethane layer, foamed glass layer, polystyrene board, etc.
保温层可以是胶粉聚苯颗粒保温层、聚氨酯发泡层、泡沫玻璃、聚苯板等。
The heat insulating layer may be polystyrene particle layer, foamed polyurethane layer, foamed glass layer, polystyrene board, etc.
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