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Insulated steel pipes and flexible insulated steel pipes are used in different locations. Flexible insulated steel pipes are suitable for structures where pipes pass through walls with vibration or strict waterproofing requirements. See 02S404. Closed insulated steel pipes are used for crossing civil defense areas. Insulated steel pipes are flexibly connected to the pipes, while closed insulated steel pipes are rigidly connected.

　　The structure of insulated steel pipes is similar to that of rigid insulated steel pipes, except that rigid insulated steel pipes only have one wing ring on the outside, and also have a baffle to prevent shock waves, which is directly welded to the wing ring and the pipe. If airtight insulated steel pipes are installed between two civil defense areas, wing rings and shock wave baffles are installed on both sides of the airtight insulated steel pipes.

　　1. The prefabrication and processing of closed insulated steel pipes should be carried out according to the pipe cross-section drawings, generally including pipe straightening, cutting, beveling, screw processing, bending, and insulated steel pipe bracket manufacturing, etc.

　　2. Each process of insulated steel pipe prefabrication should carefully check the relevant symbols of the flexible insulated steel pipe components and transplant data and other symbols.

　　3. After the prefabrication and processing of insulated steel pipes are qualified, there should be inspection symbols, and the pipe number should be indicated. Reasonable selection of free pipe sections and closed pipe sections.

　　The economic efficiency of different insulated steel pipes is also different. In engineering applications, technical and economic comparisons should be made according to the actual situation, and the types of insulated steel pipes suitable for different parts of the project should be reasonably selected, and the quality control of the installation of insulated steel pipes should be done well. Flexible insulated steel pipes are generally suitable for structures where pipes pass through walls with vibration or strict waterproofing requirements. After local treatment, apply a primer to the outer wall (primer includes red lead or cold bottom oil). The flexible waterproof shell has a wing ring exposed from the outer wall. The gap between the wing ring and the outer wall is filled with flexible joint filler. There is a wing ring in the center of the shell. The inner wall wing plate is connected to the flange by nuts and bolts. The flange cover is tightened to ensure waterproofing.

　　Stronger support ability: Traditional insulated pipes do not have strong support ability, so if the well wall deforms, it may cause damage to the insulated pipe and liquid leakage. The flexible insulated steel pipe has flexibility inside, and the shell is mainly made of solid metal material, which has better compressive strength, so it can withstand greater pressure when the wall deforms, preventing internal pipe displacement and damage from external forces.

　　Insulated steel pipes are generally used in areas without seismic fortification. When using extended insulated steel pipes in fortified areas, flexible joints should be installed near the building to reduce the interaction between the structure and the pipes.

　　Insulated steel pipes are commonly used insulated steel pipes in pipe installation. It is favored by construction projects, more environmentally friendly, facilitates the protection of pipes from damage, and has a long service life. In order to better utilize insulated steel pipes, four key points for the correct use of insulated steel pipes are briefly introduced. Hope this helps!

　　Four key points for the correct use of insulated steel pipes:

　　1. Before construction, the pipe fittings and valves need to be tested. The rated pressure must not be less than 1.5 times the working pressure of the pipeline, and the pipeline and its accessories should be checked in time, including written certification and physical inspection, etc.

　　2. For pipelines with a diameter of 25 mm or less, the cold bending method can be used. When connecting insulated steel pipes, the pipe diameter and pipe diameter are firmly connected with adhesive.

　　3. During transportation, loading, and stacking, do not throw or hit hard. Pipeline laying should be carried out after inspection and qualification. Before laying the pipeline, please check the pipeline and accessories again. Any pipeline and accessories found to have problems should not be used.

　　4. When the insulated steel pipe is a corrosive medium, if there is no concrete wall, a gap sealing casing can be used to pass through the wall.