Design and process requirements for ceramic elbow manufacturers

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I. Design and production standards for ceramic elbow manufacturers: 1. The design, manufacturing, technical properties, chemical composition, physical characteristics, inspection, testing, as well as packaging and transportation of wear-resistant pipe fittings must all comply with the requirements of the Chinese power industry standard DL/T680-2015 \"Technical Requirements for Wear-Resistant Pipes in the Power Industry\". https://pics3.baidu.com/feed/5bafa40f4bfbfbed0f878baca4bb1c3eadc31fdf.jpeg?token=f880d4880df03c8c98928bcf423f30a1 https://pics3.baidu.com/feed/d439b6003af33a87a3ed7e6b1b17fb305243b597.jpeg?token=23e8190c1edce67adb59eb3d9a5e10be https://pics4.baidu.com/feed/08f790529822720ebb4e1166ac80e14ef31fab7b.jpeg?token=e04fda366759dba8bf8f89915be95ab8 II. Design and production process requirements for ceramic elbow manufacturers 1. The ceramic lining used in ceramic elbows adopts a clamping structure in which arch-shaped ceramics are pressed together and bonded with high-temperature adhesive; this adhesive must be able to withstand temperatures of over 350°C ； The curvature of the ceramic pieces matches that of the anti-wear components, and the dimensions of the ceramics fit closely against the inner wall of the steel pipe. The overlapping area between the edges of the ceramics is ≥3 mm, which ensures that, from a technical standpoint, the anti-wear ceramic pieces will not come loose even when operating under high temperatures over extended periods of time. 2. The material of the wear-resistant elbow is wear-resistant manganese steel. The outer tube of the wear-resistant ceramic elbow has sufficient strength, with the wall thickness of the steel tube being no less than 10 mm. The wear-resistant elbow is easy to weld to the existing pipeline, and the inner diameters of the two pipelines are equal, with a tolerance of less than 1.0 mm, thereby preventing localized erosion and wear. 3. The straight sections of ceramic elbow pipes shall be made of seamless steel pipes, whose properties and dimensional tolerances shall comply with the provisions of GB3091, GB8162, and GB8163. 4. When welding wear-resistant elbows using manual arc welding ； The pipe welding surfaces are subjected to welding process treatment, and a 30° welding groove is created at the ends of the weld joints to ensure good welding performance when the product is welded at room temperature on site. 5. The inlet and outlet of the wear-resistant elbow without flange connections shall each have a welded straight pipe section of at least 500 mm to facilitate on-site installation and adjustment (the length of the straight pipe section may be increased for certain special requirements) as well as welding to the powder supply pipeline. 6. The thickness deviation of the ceramic lining layer shall be ≥ +0.2 mm; the height difference between adjacent ceramic tiles bonded to each other shall be ≤ 0.75 mm. The ceramic joints in the direction of air flow shall be ≤ 0.5 mm, while those perpendicular to the direction of air flow shall be ≤ 1.0 mm. Reverse toothing is not allowed in the ceramic joints along the direction of air flow. The gaps at the ceramic joints as well as those between the ceramics and the inner wall of the steel pipe must be tightly filled with high-temperature adhesive. The curvature curve of the overall ceramic lining should be smooth, with no protrusions or folded corners. The flow area of the wear-resistant elbow after fabrication should be identical to that of the original elbow, with the actual measurement on site serving as the basis. 7. The angular deviation of wear-resistant elbows during processing is ≤1°, the length deviation is ±1.5 mm, and the thickness deviation of the wear-resistant layer is >0 mm ； The end face of the elbow should be at a right angle to the pipe, without any twisting. 8. The inner and outer surfaces of wear-resistant pipes should be smooth and even, free from burrs, rough edges, excess material or missing material, as well as cracks, porosity or bubbles; the gaps between ceramic-lined pipes should be tight ； The surface coating should be even and uniform. 9. Protective measures must be taken at the pipe ends to prevent collisions during transportation and lifting. 10. All pipe fittings shall have dedicated lifting rings.