High temperature prefabrication and direct burial produced outside China Thermal insulation pipe , with leakage * * * line, once The Conduit Leakage occurs somewhere, and it can be displayed on the * * * detection instrument through the conduction of * * * line Insulated pipeline The exact location and degree of water leakage can tell the leak detection personnel to deal with the leaking pipe section quickly and ensure the safe operation of the heating pipe network. At present, there is no leakage * * * line for insulation pipes produced in China, which needs to be filled in.
Prefabricated insulation pipe fitting Is created by Steel pipe The utility model is composed of a glass fiber reinforced plastic inner sheath and a glass fiber reinforced plastic shell, which is characterized in that it also includes a high temperature resistant thermal insulation layer, a lubricating layer and an elastic seal. The prefabricated thermal insulation pipe fittings of the utility model effectively solve the problems of thermal insulation, sliding lubrication and waterproofing of * * * pipe ends of prefabricated directly buried thermal insulation pipes/prefabricated thermal insulation pipe fittings for 130 ℃ - 600 ℃ high temperature heat transmission in urban central heating.
Composition of prefabricated insulation pipe fittings:
(1) Working steel pipes: according to the technical requirements of the transmission medium, seamed steel pipes, seamless steel pipes and double-sided submerged arc spiral welded steel pipes are used respectively.
(2) Thermal insulation layer: rigid polyurethane foam.
(3) Protective shell: high-density polyethylene or glass fiber reinforced plastic.
(4) Leakage * * * line: When fabricating high-temperature prefabricated directly buried insulation pipes, * * * line is embedded in the insulation layer near the steel pipe. Once leakage occurs somewhere in the pipe, through the conduction of the alarm line, * * * on the * * * detection instrument can * * * show the exact location of the leakage and the size of the leakage degree, so as to notify the maintenance personnel to quickly deal with the leaking pipe section and ensure the safe operation of the heating network.
According to different sliding modes, it can be divided into internal sliding type and external sliding type.
1. Internal sliding type: the insulation structure is composed of working steel pipe, aluminum silicate, drag reduction layer, microporous calcium silicate, insulation layer, stainless steel fastening steel strip, aluminum foil reflective layer, polyurethane insulation layer, outer steel pipe, and external anti-corrosion layer.
2. External sliding type: the thermal insulation structure consists of working steel pipe, glass wool thermal insulation layer, aluminum foil reflective layer, stainless steel fastening belt, sliding guide bracket, air insulation layer, external protective steel pipe, and external anti-corrosion layer.
Structural mechanism
1. Anticorrosive coating: protect the outer steel pipe from corrosion and prolong the service life of the steel pipe.
2. External protection steel pipe: protect the insulation layer from groundwater erosion, support the work pipe and be able to bear certain external loads to ensure the normal work of the work pipe.
3. Polyurethane foam layer: ensure the medium temperature, and ensure that the surface of the external protection pipe is kept at normal temperature.
4. Barrier and reflective layer: ensure that * * * foam material does not enter the inorganic hard high temperature resistant layer; Reflect some heat from the high-temperature resistant layer.
5. Inorganic hard insulation layer: high temperature resistance, ensure the interface temperature between the insulation layer and * * *, and ensure that the foam will not be carbonized.
6. Drag reducing layer: ensure free movement of working steel pipe during thermal expansion and cold contraction.
7. Working steel pipe: ensure the normal flow of transmission medium.
