High-temperature directly buried steam insulation (steel-sheathed) bend pipe
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Product Description
High-temperature directly buried steam insulation (steel-sheathed): Production and processing range: φDN20 – ΦDN1800
Implementation standard
CJ/T200—2004 "Technical Specifications for Prefabricated Direct-Buried Steam Insulated Pipes for Urban Heating" consists of a bent pipe for the conveying medium, an anti-corrosion jacket bent pipe, and ultra-fine glass wool filling between the bent pipe and its jacket. Alternatively, it can also be constructed using graphite, calcium silicate shell pipes, and polyurethane foam composite filling. The steel-jacket (steel-on-steel) burial technology is a new burial technique that offers waterproofing, leak-proofing, impermeability, pressure resistance, and complete sealing. It represents a significant breakthrough in direct-burial installation technology, particularly suitable for regions with high groundwater levels. The primary concern in protecting directly buried pipelines is the reliable and tight waterproofing performance. Additionally, the protective pipe must possess good mechanical strength. Steel-jacket pipes, due to their high strength, are joined by welding, ensuring highly reliable waterproof sealing. Moreover, their high-temperature resistance is unmatched by other types of external protective pipes. In areas with high groundwater levels, to ensure that groundwater does not interfere with the normal operation of steam-direct-buried pipelines, it is best to use a robust, tightly sealed bent pipe casing as the outer protective layer.
Thermal insulation structure
The thermal insulation structure of steel-on-steel insulated pipes is classified into two types according to the sliding method: internal sliding type and external sliding type.
1. Internal Sliding Type: The thermal insulation structure consists of a working bend pipe, aluminum silicate, a drag-reducing layer, microporous calcium silicate, an insulating layer, a stainless steel fastening strip, an aluminum foil reflective layer, a polyurethane insulation layer, an outer bend pipe, and an external anti-corrosion layer.
2. External Sliding Type: The thermal insulation structure consists of a working bent pipe, a glass wool insulation layer, an aluminum foil reflective layer, stainless steel fastening straps, sliding guide supports, an air insulation layer, an external protective bent pipe, and an external anti-corrosion layer.
Structural mechanism
1. Anti-corrosion coating: Protects the outer bend pipe from corrosion, thereby extending its service life.
2. External protective bend pipe: Protects the insulation layer from erosion by groundwater, 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 keeps the outer protective pipe surface at a constant temperature.
4. Barrier and Reflective Layer: Ensures that the organic foam material does not penetrate into the inorganic, rigid, high-temperature-resistant layer; reflects part of the heat from the high-temperature-resistant layer.
5. Inorganic rigid insulation layer: Resistant to high temperatures, ensuring the interface temperature between it and the organic insulation layer, and preventing the foam from carbonizing.
6. Drag-reducing layer: Ensures free thermal expansion and contraction movement of the working bend pipe.
7. Working bends: Ensure the normal flow of the conveyed medium.
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