Steel-clad steel composite heat-insulating steel pipe is one of underground direct-buried pipes. Unlike the ssaw steel pipe, it adopts the method of direct underground burial without concrete structure. That is, the thermal expansion of the working steel pipe is performed in the outer pipe. This reduces the material cost, shortens the construction date, and guarantees the safety of the heating pipeline. It can be widely used in different temperature environments, and is especially suitable for high-temperature steam pipeline projects. The use of temperature up to 150 °C -450 °C. The pipe ports are generally sealed with polyethylene film or three-layer PE cold-wound tape to prevent moisture or water from entering before installation or during construction. The multi-layered staggered insulation of thermal insulation material effectively reduces heat loss, and at the same time, it adopts control measures on the surface of the jacket to prevent the generation of cold bridges, so that the temperature control of the jacket coating is ensured.
The multilayer aluminum foil reflective layer is wrapped with an insulating material, which effectively reduces the heat loss and makes the steam pipeline more economical and reasonable. The hydrophobic system is fully enclosed, flexible in layout, reasonable in structure, and safe and reliable. The drain pipe on the steel casing can not only discharge the humid gas in time, but also can serve as an alarm signal pipe for daily operation. The thermal compensation of the pipeline adopts a high-quality bellows compensator, which is installed in the casing and made into a direct-buried form. No observation wells are required. The construction is easy to operate and the construction period is short. It is suitable for conveying steam or other medium below Celsius. The product is made of steel pipe as the outer protective layer. It has the advantages of high strength, no damage, easy construction and maintenance, and long service life.
The technology of burying steel casing (steel sheathed steel) is a new technology for waterproofing, leakage prevention, impermeability, pressure resistance and full closure. It is a major breakthrough for direct burial laying technology in areas with high groundwater levels.
The primary problem of buried pipelines such as lsaw steel pipe protection pipe is the reliability of tight waterproofing. In addition, good mechanical strength is required. The steel casing is welded with high strength, and the waterproof sealing performance is very reliable. Its high temperature resistance is also unmatched by other external protection tubes.
Steel jacket steel insulation pipe steel jacket steel steam insulation steel pipe steel steam insulation pipe, steel jacket steel insulation steel pipe, steel casing (steel jacket steel) steam buried burying steel pipe insulation technology is a waterproof, leakproof, impermeability, The new technology of compressive and fully-enclosed embedment is a major breakthrough in direct burial and laying technology in areas with high groundwater levels. It is composed of a steel pipe for conveying medium, an anti-corrosion jacket steel pipe, and an ultra-fine glass wool filled between the steel pipe and the jacket steel pipe. It can also be made of graphite, silicon calcium carbide shell and polyurethane foam filled composite.
The steel steel pipe burial heat insulation pipe is composed of a working steel pipe, an insulation layer, a rolling guide pipe support, an outer casing (steel pipe) and an anticorrosion layer. The heat insulation material is bundled on the work steel pipe, and the integral thermal expansion and movement in the outer casing is controlled by the rolling guide pipe support. Therefore, the insulation layer is not damaged, the fixed bracket is a built-in fixed bracket, and the huge reinforced concrete support pier without the original “triple-type fixed bracket” is not an ideal steam pipe laying method. After many years of practical use and related test centers, the service life can reach over 30 years.