Polyurethane insulation pipe

High-density polyethylene plastic outer protective polyurethane foam, a good insulation material should have low thermal conductivity; it does not deteriorate when damp, has good heat resistance, does not corrode metals, is light in weight and has many voids; it has a certain mechanical strength, No damage when exposed to external force; easy to process, low cost, etc.

　　 High temperature is composed of steel pipe, FRP inner sheath and FRP shell. It is characterized by that it also includes a high temperature resistant thermal insulation layer, a lubricating layer, and elastic seals. The invention effectively solves the problems of heat preservation, sliding lubrication and waterproofing of the pipe ends of the prefabricated direct-buried thermal insulation pipe used for high temperature heat transmission at 130°C to 600°C in the central heating of large towns. ?

　　 mainly consists of four parts.

　　 (1) Working steel pipe: Seam steel pipe, seamless steel pipe, double-sided submerged arc spiral welded steel pipe are used according to the technical requirements of the conveying medium.

　　 (2) Insulation layer: use rigid polyurethane foam.

　　 (3) Protective shell: use high-density polyethylene or glass steel.

(4) Leakage alarm line: During manufacturing, an alarm line is embedded in the insulation layer close to the steel pipe. Once a leak occurs in a certain part of the pipe, the line can be transmitted through the special detection instrument to alarm and display the leak Accurate location and the size of the leakage, so as to notify the maintenance personnel to quickly deal with the leaking pipe section to ensure the safe operation of the heating network.