Steel sleeve (steel sleeve) embedding technology is a new embedding technology of waterproof, leak-proof, impermeability, compression and full blockade. It is a great break in the application of direct embedding technology in areas with high open water level. It is made up of super fine glass wool which is filled with steel pipes, anticorrosive steel tubes and steel pipes filled with steel pipes and outer steel pipes. It can also be made of graphite, calcium silicate tiles and polyurethane foam.

One is made from the super fine glass wool which is filled with the steel pipe, the anticorrosive coat pipe and the filled steel tube between the steel pipe and the outer steel pipe. It can also be made of graphite, calcium silicate tile shell and polyurethane foam. Steel sleeve (steel sleeve) embedding technology is a new embedding technology of waterproof, leak-proof, impermeability, compression and full blockade. It is a great break in the application of direct embedding technology in areas with high open water level. The primary problem for the maintenance pipe of directly buried pipeline is the reliability of tight waterproof. Besides, it should have good mechanical strength. Because of the high strength of steel sleeve, welding connection is adopted, the reliability of waterproof sealing performance is very high. In addition, its high temperature resistance performance can not be compared with other external maintenance pipes. In the area with high open water level, in order to ensure that the open water does not affect the normal operation of the directly buried steam pipeline, the external maintenance layer adopts a consolidated and sealed steel tube shell.

The prefabricated polyurethane direct-buried insulation pipe is mainly composed of four parts.

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

2. Insulation layer: rigid polyurethane foam.

Maintenance Shell: High Density Polyethylene or Glass Fiber Reinforced Plastic.

4. Leakage alarm line: When manufacturing prefabricated polyurethane direct-buried insulation pipe, an alarm line is embedded in the insulation layer near the steel pipe. 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 pipe section and ensure the safe operation of the heat network. 。

It is believed that after reading the introduction of https://www.sdhpgy.com, the polyurethane insulation steel pipe manufacturer in this paper, they will have their own understanding of this aspect, and other problems can be solved well in the future.