The thermal conductivity of polyurethane is: λ=0.013-0.03kcal/m·h·oC, which is much lower than other commonly used pipe insulation materials, and the thermal insulation effect is improved by 4~9 times. In addition, its water absorption is very low, about 0.2 kg/m2. The reason for the low water absorption rate is polyurethane
The sealing rate of the foam is as high as 92%. Low thermal conductivity, low water absorption, high-density polyethylene or FRP protective shell has good thermal insulation and external waterproofing, which changes the condition of “wet quilt” of heating pipes laid in traditional trenches, greatly reducing heat supply. pipeline. The overall heat loss, heat network heat loss is 2%, far below the international standard of 10%. 2, low heat loss, energy saving According to the calculation of the relevant departments, under normal circumstances, polyurethane insulation steel pipe can reduce the project cost of 25% (using FRP as a protective layer) and 10% (using high-density polyethylene as a protective layer). 1. Reduce the advantages of engineering cost polyurethane insulation pipe:




The outer coating of the oil pipeline. In December of the same year, China Petroleum Infrastructure Bureau, Pipeline Bureau, Sichuan Petroleum Design Institute, Northwest Pipeline and Command Experts jointly organized a team to travel to the United States, Italy and other pipeline coating systems. In the summer of 1994, China National Petroleum Corporation decided to introduce 3PE painting operations and painting technology for the Shaanxi-Beijing gas pipeline and library to be started.




Production enterprises do not participate in disorderly competition, do not participate in vicious competition below cost; continue to promote the lead-free work of PVC-U oil pipelines; strengthen the factory inspection and production of inferior products in the application field, and guide the regulation of market behavior. Compared with other traditional pipelines, it is necessary to improve the technical level, quality level, product grade and competitiveness.




The service of Hunan Straight Welded Pipe Factory is first class. On December 9th, when listening to the overall situation report on the education practice activities of the Hebei Provincial Party Committee, the emphasis was placed on reducing the production capacity of seamless steel pipes and controlling pollution. In the medium and long term, the production capacity of seamless steel pipes will be restored to a reasonable range, and the contradiction between supply and demand will be alleviated, which is conducive to the stability of the steel market. Seamless steel pipe theory weight table: The profit has gone far, and the current situation is that the crack is expanding.




Hunan Province Longitudinal Welded Pipe Factory First Service




Large diameter steel casing steel insulation pipe is suitable for transportation under strong corrosive oil or high temperature conditions. Seamless steel pipes are divided into hot rolling and cold drawing. Since the cold drawing process hardens the material, the pipes used in the oil pipeline are mainly carbon steel pipes, which can be divided into seamless steel pipes and welded steel pipes according to the manufacturing process. Seamless steel tubes have the characteristics of high strength and large specifications. With the development of steel pipes and the dynamic technology of applicable materials and specifications, related technologies have been widely used in the pipeline transportation of petroleum products. [3]






Zhejiang Province water supply black jacket insulation pipe production enterprises, in the early 1980s, 3PE anti-corrosion steel pipe was widely used in Europe for the first time, praised by users, is a large number of pipeline anti-corrosion system pipeline. In the summer of 1994, China National Petroleum Corporation decided to introduce 3PE painting operations and painting technology for the upcoming Shaanxi-Beijing natural gas pipeline and the Kuqin oil pipeline outer coating. In December of the same year, experts from the China Petroleum Infrastructure Bureau, the Pipeline Bureau, the Sichuan Petroleum Design Institute, and the Northwest Pipeline Command Group jointly went to the United States, Italy, Turkey and other countries to inspect the 3PE coating line. In May 1995, Liaohe Petroleum Construction Company was responsible for the tendering and introduction of the Canadian 3PE coating line of Canada Roots. It was put into normal production at the beginning of 1996. In May 1996, the Suzhou anti-corrosion plant jointly established by the Italian company Soxa and Harbin Plastics No. 6 was officially put into operation. The 3PE coating line imported from Hong Kong by the Northwest Pipeline Command and the Dutch Investment Promotion Bureau has been completed and put into operation.