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%).
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%).
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％）。
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