关键词 】 管道绝热 ；聚氨酯管道保温 ；管道热损失 [gap=3366]Key words〕 Pipe heat insulation；Polyurethane pipe heat preservation；Heat loss
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聚氨酯管道保温目前是最优质的保温材料，其唯一缺点是造价高。
Pu heat preservation is currently the most high-quality pipe insulation, its only drawback is that cost is high.
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%).
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