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％)。文中介绍了管道热损失的测试方法、摸注泡沫保温结构及其施工方法、以及该保温层的经济效益。并对经济保温层厚度和保温地段的选取分别作了阐述。对保温施工中出现的问题也提出了解决办法。 The crude oil long-distance pipeline shallow buried and low-lying section of the larger heat loss, the use of polyurethane rigid foam insulation effect (insulation efficiency of 86.3%). This paper introduces the test method of pipe heat loss, the foam insulation structure and its construction method, as well as the economic benefits of the insulation layer. And the economic insulation layer thickness and the selection of insulation were elaborated. The problems in insulation construction also put forward solutions.