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Insulation material for steel-cased steel insulated pipes. The insulation material is applied to the working steel pipe in a staggered, doublelayer staggered joint configuration and bundled together, which reduces heat loss, prevents surface friction with the steel casing, and extends the service life of the insulation layer. Its thickness depends on the of the medium. The reliability of waterproofing is a critical issue for underground pipeline insulation, steel-cased steel steam insulated pipes, and direct-buried pipes. In addition, must possess good mechanical strength. Due to the high strength of the steel casing and the use of welded connections, the reliability of its waterproof sealing performance is very high. The insulated steel pipe a two-layer inorganic zinc-rich primer (temperature resistant ≥400°C) anti-corrosion coating. The pipe ends are sealed with polyethylene film or three- PE cold-applied tape to prevent moisture ingress before installation or during construction. The insulation material is wrapped in multiple staggered layers, effectively reducing heat loss while controlling the surface of the casing to the occurrence of thermal bridges and ensure the temperature control of the casing's anti-corrosion layer. The insulation material is wrapped with multiple layers of aluminum foil reflective layers, reducing heat loss and making the steam pipeline more economical and reasonable. Steel-cased steel insulated pipes are steel pipes with anti-corrosion properties and good insulation performance. They been widely applied and promoted in building construction and continue to be expanded. Anti-corrosion insulated steel pipes have different processing types and methods. Different processing methods certainly give the steel pipes different and functions, and the scale of application will change accordingly.
The hazards caused by pipe vibration mainly include: (1) Long-term vibration of steel-clad steel steam insulation pipes will endanger pipe. Due to continuous or indirect vibration, alternating stresses are generated on the pipe welds. Alternating stresses easily cause fatigue cracks in the welds and their heat-affected zones, leading to steam leaks and affecting safety. (2) Vibration of steel-clad insulation pipes will damage safety accessories on the pipes. Pipe vibration also affects accessories such as pressure gauges safety valves. For example, the vibration of the pressure gauge pointer not only affects normal indication but also easily causes fatigue cracks at the welds, resulting in damage. (3) Steel- insulation pipes with severe vibration will also threaten the safe temperature operation of the boiler unit. (4) Vibration of steam insulation pipes directly affects the service life of the pipes. V caused by water hammer phenomena will erode the pipe walls and elbows, leading to local thinning of the pipes. Under the action of alternating stresses, it is easy to form cracks and other defects.(5) Due to the high temperature and high pressure characteristics of steel-clad steam insulation pipes, abnormal pipe vibration such as resonance will inevitably cause psychological fear among frontline production employees, leading low production efficiency.
The steel-jacketed pre-insulated pipe products have the following features. First, a steel pipe is selected as the outer protective layer, which high strength, is not easily damaged, and can withstand large upper loads. To extend the service life, anti-corrosion treatment should be applied to the steel jacket. Second, rolling support structure is reasonably planned, reducing the stress on the fixed supports and improving the stability of the pipeline. Third, the vacuum layer eliminates heat conduction and convection, reducing heat loss Compared with the air-layer structure, the temperature of the outer jacket can drop by 8–13°C at the same insulation thickness. Fourth, the vacuum treatment solves the problem the inner wall of the outer steel jacket being easily corroded by hot and humid air, extending the service life of directly buried steam pipelines to 30 years. Finally, the vacuum equipment of installing moisture drain pipes every 50–60 meters in the air-layer structure, reducing the damage rate of the outer jacket and making the pipeline along the route more aesthetically pleasing.Installation principles of steel-jacketed insulated pipes: large before small; main line before branches; rising before descending.
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Basic requirements for the installation process of steel-jacketed insulated pipes I. Strictly implement the quality acceptance specifications for construction. II. Before pipe installation, the specifications, material, and design of the pipes should be carefully checked to ensure they meet the requirements, and rust removal, painting, pipe, and rust removal should be carried out according to regulations. III. Installation principles of steel-jacketed insulated pipes: large before small; main line before branches; up before. IV. The water system has a drain valve at the low point and an automatic drain valve at the high point. V. Pipe installation should follow the principles of ", small, up first, down later, and out first". VI. After pipe installation is completed, a water pressure test shall be conducted according to the design requirements. . Welding methods for steel-jacketed insulated pipes I. Pipe welding construction is carried out on the basis of laying and marking, following processes such as straightening pipe materials, cutting, beveling, grouping, welding, and slag removal. II. Bevel processing and cleaning: Generally, oxy-acetylene flame cutting and gas cutting are used to cut bevel pipe, and the pipe mouth is cleaned with a file. Try using a grinder to cut small-diameter pipes. Remove oil, rust, and water within 20 mm on sides of the bevel, ensure the metallic luster of the bevel, ensure the surface defects of the bevel, and clean the inside and outside of the bevel. III. Electrodes flux should be dried according to the instructions before use, and should be kept dry during use. IV. Welding construction shall be carried out strictly in accordance with the welding operation instructions. equipment must be inspected before use. It is strictly forbidden for unqualified equipment to enter the construction site. Self-inspection and mutual inspection should be carried out during the welding process to control welding.
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