Purchase requirements for ceramic wear-resistant elbows

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1. Elbow material: The outer steel structure is made of seamless carbon steel pipes, with material grade #20； The ceramic is cast by centrifugation; its composition consists of Al2O3 in an amount of over 95%. It is sintered using the centrifugation method, with the thickness of the ceramic layer being no less than 5 mm. A cover is attached to the outside of the elbow, and this cover contains wear-resistant filling material to ensure that the entire area of the elbow is covered. 30-degree wear-resistant elbow (material: wear-resistant ceramic), Φ159X10X6, R=700, DN125. 2. The pipe elbows in contact with ash should be made of ceramic material. A straight pipe section with a length of not less than 1000 mm should be provided on the outlet side of the wear-resistant elbow, and a straight pipe section with a length of not less than 500 mm should be provided on the inlet side. The bending radius of the wear-resistant elbow should be at least 5 times the diameter of the ash transport pipe. The hardness of the inner surface of the elbow should be at least HRC55. The connection method for the elbows is welding (butt welding). 3. The requirements regarding the quantity and dimensions of wear-resistant ceramic elbows can be found in the “Summary Table of Wear-Resistant Ceramic Elbows” along with the accompanying drawings: https://pics4.baidu.com/feed/cc11728b4710b9124ad78692a8da6a0b92452273.jpeg?token=8fcbcf36fe2b1456dcb8265d07cc8202 4. Main technical requirements: 4.1 The design, manufacturing, inspection, testing, and packaging of this equipment must comply with current **standards, industry standards, and other relevant standards. 4.2 The equipment performance of the wear-resistant elbows shall meet the design and operational requirements for the piping fittings in the powder delivery system of 2×600MW thermal power generation units. 4.3 The connection method for elbows is welding (butt welding) ； The steel pipes shall be seamless or welded pipes with an ellipticity of less than 0.5 mm; all welds shall undergo a uniform oil penetration test, and 10% radiographic inspection shall be carried out to ensure compliance ； Elbows should indicate the flow direction of the medium and be equipped with dedicated lifting rings. 4.4 The design of elbows shall meet the requirements of wear resistance, vibration and detachment prevention, dust accumulation prevention, and good weldability. 4.5 The shape of the wear-resistant elbow, as well as the dimensions of its various connections and installation dimensions, must fully meet the requirements specified in the design. The inlet and outlet of the wear-resistant elbow are each equipped with a certain length of straight section. There are no special requirements for on-site welding of the product; proper bevels must be created to ensure good weldability when the product is welded at room temperature on site. 4.6 Technical requirements for wear-resistant elbows: 4.6.1 The design, manufacturing, technical performance, chemical composition, physical properties, as well as packaging and transportation of the powder supply pipeline’s wear-resistant elbows shall comply with the Chinese power industry standard DL/T690—1999 \"Technical Requirements for Wear-Resistant Pipelines\". 4.6.2 The wear-resistant elbows shall have a smooth transition, with a smooth and even surface; the height difference shall be <1 mm. Bending angle deviation ±0.3°. It also has good thermal stability, ensuring long-term normal operation. 4.6.3 The arrived wear-resistant elbows shall have the elbow number, as well as the elbow angle, bending radius, and length of the straight sections at the inlet and outlet, marked with a steel stamp in the middle of the outside surface of the elbow.