Since the birth of polyurethane synthetic data in the 1930s, polyurethane thermal insulation pipe has been developed rapidly as an excellent thermal insulation material, and its application scope is becoming more and more widespread. Because of its construction specifications, polyurethane thermal insulation pipe, polyurethane foamed thermal insulation pipe in the pipeline system, elbow is the pipe fittings to change the direction of the pipeline. According to the angle, there are three commonly used, in addition, according to engineering requirements, including other abnormal angle elbows. The data of elbows are cast iron, stainless steel, alloy steel, calcinable cast iron, carbon steel, non-ferrous metals and plastics. The ways of joint with pipe are flange joint, hot melt joint, electric melt joint, thread joint and socket joint. According to the consumption process, it can be divided into welding elbow, punching elbow and casting elbow.

Polyurethane Thermal Insulation Pipe

(1) Polyurethane insulating steel pipe working pipe: According to the technical requirements of delivery medium, seamless steel pipe, double-sided submerged arc spiral welded steel pipe are used respectively.

(2) Polyurethane insulation pipe insulation layer: rigid polyurethane foam plastic.

(3) Polyurethane insulating steel pipe maintenance shell: using high density polyethylene or FRP.

(4) Leakage alarm line for polyurethane insulating steel pipes: When manufacturing high temperature prefabricated directly buried insulating pipes, an alarm line is embedded in the insulating layer near the steel pipes. Once leakage occurs somewhere in the pipeline and is transmitted by the alarm line, it can alarm on the special detection instrument and show the exact position and level of leakage, so as to inform the inspectors to quickly dispose of the leakage section. Guarantee the operation of the heat network.

Polyurethane insulating steel pipe has become a comparatively mature technology in some foreign countries. Over the past decade, after digestion and absorption of this technology, China's heating engineers and technicians are pushing the domestic pipeline network laying technology to a higher level. Over the past decade, the theoretical achievements have amply proved that polyurethane thermal insulation direct buried pipe laying method has many advantages compared with traditional trench and overhead laying. The directly buried thermal insulation pipe is made up of a steel tube, a high density polyethylene sheath pipe, and a rigid polyurethane foam insulation layer between the steel tube and the outer tube. This is also the direct buried polyurethane thermal insulation pipe in China's heating project.

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