High-Temperature Direct-Buried Steam Insulation (Steel-Sheathed)
Keywords:
Category:
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"
One type consists of a combination of steel pipes conveying the medium, corrosion-resistant outer jackets, and ultra-fine glass wool filling the space between the inner pipe and the outer jacket. Alternatively, it can also be made by combining graphite, calcium silicate pipe shells, and polyurethane foam insulation. The steel-jacketed (steel-on-steel) burial technology is a new buried installation method that offers waterproofing, leak-proof performance, resistance to seepage, compression resistance, and complete enclosure. It represents a significant breakthrough in direct-burial installation techniques, particularly for applications in areas with high groundwater levels. The primary challenge in protecting directly buried pipelines is ensuring reliable, watertight sealing. Additionally, the protective casing must possess excellent mechanical strength. Steel-jacketed casings, due to their high strength, are joined by welding, which provides exceptionally reliable waterproof sealing. Moreover, their high-temperature resistance is unmatched by other types of external protective casings. In regions with high groundwater levels, to ensure that groundwater does not interfere with the normal operation of steam pipelines laid in direct burial, it is best to use a robust, tightly sealed steel pipe shell as the external 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 steel pipe, silica alumina, a friction-reducing layer, microporous calcium silicate, an insulation layer, a stainless steel clamping band, an aluminum foil reflective layer, a polyurethane insulation layer, an outer steel pipe, and an external anti-corrosion layer.
2. External Sliding Type: The thermal insulation structure consists of a working steel pipe, a glass wool thermal insulation layer, an aluminum foil reflective layer, stainless steel fastening straps, sliding guide supports, an air insulation layer, an outer protective steel pipe, and an external anti-corrosion coating.
Structural mechanism
1. Anti-corrosion coating: Protects the outer steel pipe from corrosion by corrosive substances, thereby extending the service life of the steel pipe.
2. Outer protective 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 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 steel pipe.
7. Working steel pipe: Ensures the normal flow of the conveyed medium.
Recommended Products
Product Inquiry
Please provide your phone number and email address. This will help us contact you promptly and resolve your issue as soon as possible.
Shisheng Tube-material Antiseptic
HOT LINE::
ADDRESS:
Puwacheng Industrial Development Zone,
Yanshan County, Hebei Province