Introduction to the wear resistance of flexible waterproof sleeves made of stainless steel

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Flexible waterproof sleeves are hardware fittings used in structures where pipes pass through walls and are subject to vibration or require strict waterproofing; manufacturing companies generally produce them in accordance with the standard drawing sets S312 and 02S404 developed by the Building Science Research Institute. In the wall at the location where the flexible waterproof sleeve passes through it, if the wall is not made of concrete, it should be replaced with a concrete wall; moreover, the sleeve must be solidified within the wall in one go ； Flexible waterproof sleeves are widely used in construction, chemical industry, steel manufacturing, water supply, sewage treatment, and other sectors. 　　Generally, sleeves are used when constructing pools; they serve as passages for pipes to lead into the pool. However, ordinary sleeves are difficult to seal, resulting in leaks between the sleeve and the pipe, as well as leaks between the sleeve and the wall. Using only a waterproof sleeve can address leaks between the sleeve and the wall, but it cannot ensure a seal between the sleeve and the pipe; a flexible waterproof sleeve can solve both problems. 　　Casing can be divided into: standard casing – 2-4 centimeters thicker than the pipe to be used, fixed in the wall or panel, with the pipe passing through it. A flexible sleeve – this is one in which a flexible material is used to seal the gap between the sleeve and the pipe, thereby providing a sealing effect. Rigid sleeve – this means that a rigid material is used to seal the gap between the sleeve and the pipe in order to achieve a tight seal. A waterproof sleeve is one that is used in environments where it is necessary to prevent liquids from leaking out or in (such as pools, septic tanks, basements, etc.). It features at least one additional layer of waterproof material on its outer wall, so that when the sleeve is poured into the wall structure, it forms a single unit that will not develop cracks and leaks due to thermal expansion and contraction. Sealing requirements: 1. When the side exposed to the environment contains corrosive substances, sealing materials can be used to fill the gaps; for details, refer to the atlas on waterproof sleeves as well as the installation diagrams for flexible waterproof sleeves (Type A). 　　2. Filling materials for flexible waterproof sleeves: asphalt hemp, polystyrene boards, polyvinyl chloride foam boards. 　　3. Sealant: polysulfide sealant, polyurethane sealant. 　　4. The dimensional tolerances and form and position tolerances of welded structures shall comply with JB/T5000.3-1998. Welding is carried out using manual arc welding, with electrode type E4303 and grade J422. The basic shape and dimensions of the weld groove shall comply with GB985-88. 　　5. When the flexible waterproof sleeve is formed by rolling, the allowable deviation in circumference is: D2 ≤ 600, and for D2 > 600, it is ±0.0035D2. 　　6. The thickness of the concrete wall at the point where it passes through another wall should be no less than 300; otherwise, one side or both sides of the wall must be thickened, with the diameter of the thickened portion being at least D5+200. 　　7. The weight of the flexible waterproof sleeve is calculated based on L=300; if the wall thickness is greater than 300, a separate calculation shall be conducted. 　　8. When a flexible waterproof sleeve passes through a wall that is not made of concrete, that section of the wall should be converted to concrete; the pouring area for the concrete should be 200 larger than the diameter of the sleeve’s flange (D5), and the sleeve must be poured into the inner wall in one go. 　　Based on standard atlases, they can be classified as national standards and non-standard ones. National standard waterproof sleeves are those that are manufactured using materials selected in full compliance with the relevant standard drawings 02S404 or 02S312 issued by the Ministry of Construction; strict requirements are imposed on the thickness of the flanges, the thickness of the wing rings, as well as the diameter and thickness of the pipes. Non-standard products are those in which, although their shape and general structure conform to the standard specifications, more lenient requirements are applied when selecting materials regarding flange thickness, girth ring thickness, as well as pipe diameter and thickness. Strictly speaking, these are defective products. Of course, a certain degree of relaxation of standards does not affect performance, but excessive relaxation can impact operational efficiency. 　　According to the atlas, they can be classified into S312 type flexible waterproof sleeves and 02S404 type flexible waterproof sleeves. The two differ in terms of their external dimensions and structural design. 　　Specifications DN15mm—DN3200mm