Development and application of thermal insulation steel pipe more and more world attention. In the 1970 of the 20th century, the foreign attention heat preservation pipe production and application, and strive to substantially reduce energy consumption, so as to reduce environmental pollution and global warming. Insulation industry abroad has a long history, and new insulation materials are constantly emerging.
Prior to 1980, insulation steel pipe in China are developing very slowly, a few thermal plants produce only a small amount of underground straight buried pipe, insulation industry in China after more than 30 years of effort, especially after nearly 10 years of rapid development, many products from scratch, from single to diversify from low to high quality and widely used. Polyurethane is the most commonly used insulation materials. Rigid polyurethane has many excellent properties, widely used in thermal insulation field in Europe and the United States. About 49% of the thermal insulation material of Europe and other developed countries for polyurethane materials, while in China the ratio is less than 20%. Therefore, the development of polyurethane thermal insulation steel pipe in China still has a lot of space.