Anti corrosion and thermal insulation steel pipe manufacturer
High temperature prefabricated directly buried insulation pipe is a kind of directly buried prefabricated insulation pipe with good insulation performance, safety and reliability and low project cost. It effectively solves the problems of thermal insulation, sliding lubrication and waterproof of exposed pipe end of prefabricated directly buried thermal insulation pipe for high temperature heat transmission at 130 ℃ - 600 ℃ in urban central heating. High temperature prefabricated directly buried insulation pipe not only has the advanced technology and practical performance unmatched by traditional trench and overhead pipeline, but also has remarkable social and economic benefits. It is also a powerful measure for heating and energy saving. High temperature prefabricated directly buried insulation pipe adopts directly buried heating pipeline technology, which marks that the development of heating pipeline technology in China has entered a new starting point.?
The thermal insulation pipe is composed of steel pipe, FRP inner sheath and FRP shell, which is characterized in that it also includes high temperature resistant thermal insulation layer, lubricating layer and elastic seal. The utility model effectively solves the problems of thermal insulation, sliding lubrication and waterproof of the exposed pipe end of the prefabricated directly buried thermal insulation pipe for high temperature heat transmission at 130 ℃ - 600 ℃ in urban central heating.
High temperature prefabricated directly buried insulation pipe is mainly composed of four parts.
(1). Working steel pipe: according to the technical requirements of conveying medium, seamless steel pipe, double-sided submerged arc spiral welded steel pipe are adopted respectively.
(2). insulation layer: rigid polyurethane foam.
(3). Protective shell: high density polyethylene or FRP.
(4). Leakage alarm line: when manufacturing high-temperature prefabricated directly buried insulation pipe, an alarm line is buried in the insulation layer close to the steel pipe. Once a leakage occurs somewhere in the pipe, the alarm can be given on the special detection instrument through the conduction of the alarm line, and the accurate position and degree of leakage can be displayed, so as to inform the maintenance personnel to deal with the leaking pipe section quickly, Ensure the safe operation of heat supply network.
High temperature prefabricated directly buried insulation pipe - advantages and characteristics
1. Reduce project cost.
According to the calculation of relevant departments, the double pipe heating pipeline can generally reduce the project cost by about 25% (using FRP as the protective layer) and 10% (using high-density polyethylene as the protective layer).
2. Low heat loss and energy saving.
Insulated steel pipe is an important factor affecting energy saving. The development and application of insulated steel pipe has attracted more and more attention all over the world. After the 1970s, foreign countries generally pay attention to the production and application of thermal insulation steel pipe, and strive to greatly reduce energy consumption, so as to reduce environmental pollution and greenhouse effect. Foreign thermal insulation industry has a long history, and new thermal insulation materials are constantly emerging. Before 1980, the development of thermal insulation steel pipe in China was very slow. A few thermal insulation plants can only produce a small amount of underground directly buried thermal insulation steel pipe. However, after more than 30 years of efforts, especially after nearly 10 years of rapid development, many products have been used more and more widely from scratch, from single to diversified, from low to high quality. Polyurethane material is the most commonly used thermal insulation material in the world. Rigid polyurethane has many excellent properties and is widely used in the field of thermal insulation in Europe and America. About 49% of thermal insulation materials in developed countries such as Europe and the United States are polyurethane materials, while in China, this proportion is less than 20%. Therefore, polyurethane insulated steel pipe still has great development space in China.
1. External protective steel pipe: protect the insulation layer from groundwater erosion, support the working pipe and can bear a certain external load to ensure the normal operation of the working pipe.
2. Anti corrosion coating: protect the outer steel pipe from corrosive substances and prolong the service life of the steel pipe.
3. Drag reduction layer: ensure the free movement of thermal expansion and cold contraction of working steel pipe.
4, polyurethane foam layer: ensure the temperature of the medium, and ensure the surface of the outer tube is kept at room temperature.
5. Barrier and reflector: ensure that organic foam material does not enter the inorganic hard and high-temperature resistant layer. Reflect part of the heat of the high temperature resistant layer.
6. Working steel pipe: ensure the normal flow of conveying medium.
7. Inorganic hard insulation layer: high temperature resistance, ensure the interface temperature between the organic insulation layer and ensure that the foam is not carbonized.