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Ceramic powder tube wear-resistant elbows are widely used in many fields. For example, in the chemical industry, highly corrosion-resistant pipe fittings are required because highly corrosive chemicals are often transported in pipes. The wear-resistant elbow of ceramic powder pipe can well meet this demand. In addition, in the coal, steel, power and other industries, it is often necessary to use ceramic powder pipe wear-resistant elbows to ensure the normal operation of the pipeline system.
1. Requirements for wear-resistant elbows of ceramic powder pipes.
1. The installation of wear-resistant ceramic sheets should be tightened, stable and smooth. After the installation is completed, the outer surface of the ceramic sheet should be smooth and flat, without falling off and cracking. Make sure that the paste is flat and the gap between the pieces is 04-0.6mm, the gap between the plates is less than 1mm, the whole is flat, there are no obvious pits and protrusions, and the height difference between the pieces is not more than 05mm。
2. The welding point between the ceramic sheet and the base layer should be firm, full and free of welding defects, so as to ensure that the ceramic piece and the base layer are firmly attached and will not fall off. The edge of the pasted ceramic sheet and the metal inner wall of the unpasted part should be filled with ceramic powder to make it smooth transition, and the required anti-wear parts must be completely covered, and the corners of the ceramic sheet that cannot be pasted must be filled with wear-resistant ceramic powder filler.
3. After the powder tube is equipped with wear-resistant ceramics, it should be tight and not leaky. The wear-resistant ceramic sheet installed in the powder tube should be wear-resistant, and the annual wear and tear should be 10mm。
4. The ceramic sheet used in the powder tube is more than 92% alumina, and the hardness is not less than HV1100. The adhesive used to bond wear-resistant ceramic sheets should be resistant to high temperatures and 300 °C. Wear-resistant ceramic pipes need to be made with convex and concave inlay anti-falling design, as shown in the figure below.
5. Wear-resistant ceramic pipes and elbows need to meet the following parameter requirements.
6. The inner surface of the pipeline ceramic should be kept flat and smooth, and the height difference of the adjacent porcelain pieces should not exceed 05 mm. The two ends of the wear-resistant ceramic pipe are welded with 530 10 pipes, and the welding groove is reserved at the interface to dock with the original powder pipe. There should be at least 100 mm of straight pipe section bonded with ceramic sheet at the end of the elbow to ensure that when the air powder enters the steel pipe without ceramic protective parts, the medium flow direction is parallel to the pipe wall, so as to reduce the phenomenon of aggravated wear caused by turbulence of the steel pipe.
7. The two ends of the wear-resistant ceramic pipe should be welded with straight sections (made of Q345), the length of the straight section should not be less than 100 mm, and the welding should be carried out by V-groove welding process. The main material of the elbow can be welded and spliced with Q235 material, and all non-lined ceramic parts of the elbow are made of Q345 material.
2. Requirements and standards for wear-resistant elbows of ceramic powder pipes.
The manufacture of wear-resistant ceramic powder tube conforms to the relevant national standards and the standards issued by the original ministry.
GB324 Weld Symbolic Notation.
GB T985 Basic types and dimensions of weld grooves for gas welding, manual arc welding and gas shielded welding.
GB8162 Seamless steel pipe for structure.
GB228 Tensile Test Method for Metals.
GB3091 Welded steel pipe for low-pressure fluid transfer.
GB T16534 Test method for hardness of fine ceramics at room temperature.
GB T6569 Test Method for Flexural Strength of Fine Ceramics.
DL T869 Technical specification for welding of thermal power plants.
DL T680 Wear-Resistant Pipes Technical Condition.