Steel-clad steel composite thermal insulation pipe structural mechanism
Corrosion protection layer: Protects the outer steel pipe from corrosive substances, thereby extending the service life of the steel pipe.
2. External Steel Pipe: Protects the insulation layer from groundwater erosion, supports the working pipe, and can withstand certain external loads, ensuring the normal operation of the working pipe.
3. Polyurethane Foam Layer: Ensures the medium temperature and maintains the surface of the outer sheath at room temperature.
4. Barrier and Reflective Layer: Ensures foam material does not enter the inorganic hard, high-temperature-resistant layer; reflects part of the high-temperature layer's heat.
5. Inorganic rigid thermal insulation layer: withstanding high temperatures, ensuring the interface temperature between the insulation layer, and guaranteeing that the foam does not carbonize.
6. Friction-reducing layer: Ensures free thermal expansion and contraction movement of the working pipe.
7. Work钢管: Ensures normal flow of the conveying medium.
The thermal insulation material for steel-clad steel pipe is ultra-fine glass wool pipe shell. The ultra-fine glass wool pipe shell boasts advantages such as double-layer staggered wrapping, fewer seams, and good breathability. In case the insulation layer gets wet during construction, it can be completely dried out by gradually increasing the steam temperature for exhaust and drying. After drying, the shape and thermal insulation performance remain excellent. The rolling support structure is designed reasonably with minimal rolling friction, reducing the load on the fixed supports. The mechanical analysis principle is simple, significantly improving the stability and safety of the pipeline. The vacuum layer eliminates heat conduction and convection through the air layer, reducing heat loss. Compared to the air layer structure, the outer wall temperature can be reduced by 8-13°C under the same insulation thickness. The vacuum extraction device solves the problem of easy corrosion of the inner wall of the outer steel sleeve by hot and humid air, greatly extending the service life of the buried steam pipeline. The product lifespan is increased to 30 years. The vacuum extraction device also resolves the issue of having to set a pair of exhaust pipes every 50-60 meters in the air layer structure, reducing the damage rate of the outer casing and making the pipeline more aesthetically pleasing. Additionally, it reduces the cost increased by setting exhaust pipes by approximately 50/m.
The steel-clad steel composite thermal insulation pipe is composed of a working steel pipe, insulation layer, rolling guide pipe support, outer casing (steel pipe), and anti-corrosion layer. The insulation material is bound to the working steel pipe, and it relies on the rolling guide pipe support for overall thermal expansion movement within the outer casing, thus not damaging the insulation layer. The fixed bracket is an internal fixed bracket, eliminating the need for the large reinforced concrete support of the original "three-way fixed bracket." It is an ideal method for laying steam pipes. After years of practical use and testing by relevant testing centers, its service life can exceed thirty years.
Steel-clad steel thermal insulation pipes are suitable for the following applications: - Transmission medium: Steam - Working pressure: ≤1.6 MPa - Medium temperature: ≤350℃ - Working environment: Underground soil
Structural Diagram of Steel Clad Steel Insulation Pipe
1. Steel pipes (pipe tubes) 2. Water-repellent XN-3 alumina silicate thermal insulation shells (or water-repellent composite silicate insulation shells or non-asbestos calcium silicate insulation shells) 3. Rolling guide pipe supports 4. Binding tape pipe 5. External sheath (steel sleeve) 6. Corrosion protection
Steelflagged Steel Pipe Insulation Material Technical Requirements
1. The working steel pipes are made of seamless steel pipes for fluid transportation, using the GB8163-99 standard, or the GB3087 standard. Alternatively, steel pipes from other standards can be used upon customer request or based on supply conditions.
2. Insulation materials used include water-repellent composite silicate pipe shells or XN-3 alumino silicate (moisture-proof ceramic products) pipe shells, or other insulation materials as per customer requirements. The insulation materials are double-sided and offsetly bound around the working steel pipe, forming an integrated unit, which reduces heat loss, avoids surface friction with the steel casing, and extends the service life of the insulation layer. The thickness is determined by the medium temperature.
The steel clad steel composite thermal insulation pipe is composed of an inner working steel pipe, an outer protective steel pipe, and an intermediate insulation layer. The working steel pipe is coated with two layers of anti-rust paint after sandblasting. The insulation layer consists of high-temperature fiber felt, ultra-fine-pored calcium silicate thermal insulation boards, and polyurethane foam plastic. The outer steel pipe is wrapped with six layers of glass fiber and resin anti-corrosion coating after sandblasting treatment.
Performance Features:
Waterproof and moisture-proof
2. Withstanding high temperature and pressure, suitable for medium temperatures up to 350°C and pressures up to 2.5 MPa.
3. Low heat consumption, superior thermal insulation performance compared to any traditional insulation method.
4. Strong corrosion resistance, high strength of the protective layer, and difficult to be damaged.
Long lifespan, up to 30-50 years.
The primary concern for the protective casing of buried pipelines is the reliability of tight waterproofing. Additionally, it must possess good mechanical strength. Steel sleeve pipes, due to their high strength, are焊接 connected, ensuring an extremely high reliability in waterproofing密封 performance. Furthermore, their high-temperature resistance is unparalleled by other external protective casings.
