Explanation of specifications and models for wear-resistant elbows
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Many purchasers of wear-resistant elbows are not very familiar with the various specifications and models of such elbows. As a manufacturer of wear-resistant elbows, we would like to provide a detailed explanation of these models, so that people can gain a better understanding of the basic knowledge related to wear-resistant elbows. I. To arrange the purchase of wear-resistant elbows, it is necessary to provide information on the material and specifications of such elbows. Materials for wear-resistant elbows include corundum ceramics, high-chromium wear-resistant steel, and high-temperature resistant turtle-shell mesh. The material for wear-resistant elbows must be selected based on the actual operating conditions. https://iknow-pic.cdn.bcebos.com/9345d688d43f87947887994ac21b0ef41bd53a5e?x-bce-process%3Dimage%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_jpg II. Detailed explanation of the models of wear-resistant elbows: these models are determined by factors such as the angle, bending radius, thickness of the steel pipe, and thickness of the ceramic layer. For example, 90° wear-resistant elbow, dn150*8, R=1000, ceramic thickness of 4mm, 26 pieces. The elbow angle is 90 degrees; other angles available are 60 degrees, 45 degrees, and 30 degrees. The diameter of the elbow is 150 mm and its thickness is 8 mm. R represents the bending radius of the elbow, which is 1000 mm. The thickness of the ceramic lining is 4 mm. This ceramic elbow is designed for a outer diameter of 180 mm; a diameter of 159 mm cannot be used as it will not ensure an adequate passage size. III. Table of common models for wear-resistant elbows https://iknow-pic.cdn.bcebos.com/fd039245d688d43f5cd140966d1ed21b0ef43b5e?x-bce-process%3Dimage%2Fresize%2Cm_lfit%2Cw_600%2Ch_800%2Climit_1%2Fquality%2Cq_85%2Fformat%2Cf_jpg
The wear-resistant ceramic elbow is created by using a special high-temperature resistant adhesive developed by our company to attach special corundum wear-resistant ceramic sheets to the interior of the steel pipe elbow. This solution addresses the severe wear problem in the conveying elbows used in industries such as thermal power, metallurgy, steel manufacturing, and cement production. By combining the steel pipe elbow with these wear-resistant ceramic sheets, it becomes easier to carry out rapid replacements and construction work. Depending on the working conditions, the manufacturing process varies; the direct bonding method, bolt clamping method, or integral molding method can be used. Among them, the pipe integral molding method (RHS) involves using selected alumina particles to fire a lined pipe through various molding methods, and then pouring a special filler into the interior of the steel pipe to form the integral pipe. The pipes formed by this method differ from the ceramic composite pipes produced using the self-igniting combustion technique, as their inner ceramic crystals are exactly the same as those in the ceramic coatings. Its advantage is a smooth inner wall of the pipe and excellent wear resistance, making it suitable for slag transfer and ash removal systems that have high requirements for pipe material. The bolt clamping method is a ceramic assembly technique that employs triple fixation through adhesive bonding, mutual pressing and interlocking of ceramic pieces, and bolt clamping. Thanks to the triple fixation method, the ceramic and the equipment have become one; even when operating at high temperatures above 1000°C, the ceramic does not come off.
Lined ceramic wear-resistant elbows are divided into three categories: self-igniting ceramic elbows, ceramic patch wear-resistant elbows, and ceramic ring wear-resistant elbows. 1. The self-propagating ceramic wear-resistant elbow is manufactured using a world-class self-propagating process, along with a chemical reaction centrifugal casting technique. The ceramic layer is formed into dense corundum porcelain (AL2O3) at temperatures above 2200°C, and it forms a strong bond with the steel pipe through a transition layer. Composite pipes take full advantage of the high strength, good toughness, impact resistance, and excellent weldability of steel pipes, as well as the high hardness, high wear resistance, corrosion resistance, and heat resistance of corundum ceramics, thereby overcoming the weaknesses of steel pipes such as low hardness and poor wear resistance, as well as the poor toughness of ceramics. II. Requirements for ceramic wear-resistant elbows with self-igniting properties upon leaving the factory: 1. Hardness testing – Since the lining layer of these ceramic composite pipes is made of corundum ceramic (α-Al2O3), their Mohs hardness can reach 9.0, which is equivalent to HRC 90 or higher. Therefore, it exhibits high wear resistance against abrasive media transported in industries such as metallurgy, power generation, mining, and coal mining. 2. Surface inspection: SHS ceramic composite pipes are required to have a smooth inner surface free from rust, especially without burrs at the ends. Therefore, self-igniting ceramic wear-resistant elbows are corrosion-resistant and scale-proof. 3. Angle detection: All elbows of self-igniting ceramic wear-resistant elbows are checked for their angle at the time of leaving the factory; the angle error must not exceed 0.5 degrees to ensure smooth installation on site.
I. Technical specification requirements for wear-resistant ceramic elbow pipes 1. Wear-resistant ceramic elbow pipes are primarily used to resist the abrasive wear caused by mixed airflow on the pipes, to prevent leaks resulting from such wear and thus avoid environmental contamination, and to extend the service life of the pipes as much as possible. 2. The design, manufacture, and acceptance of wear-resistant ceramic elbows and wear-resistant ceramic straight pipes are carried out in accordance with current international and domestic specifications and standards. Ceramic-lined wear-resistant elbow pipes should be designed and manufactured in accordance with the YB/T 176-2000 standard. 3. The interface dimensions, external dimensions, flow cross-section, and other design parameters of the wear-resistant ceramic elbow shall meet the requirements ； It provides good connection to pipes or other equipment, with excellent sealing properties. For all weld seams between the wear-resistant elbow pipes and wear-resistant ceramic straight pipes, ceramic pieces are applied using the same process on the inner walls in situ; the ceramics should be flat and form a smooth surface. The diameter and material of the straight section of the wear-resistant elbow should be chosen in such a way as to facilitate welding to the powder supply pipeline. The appearance of wear-resistant elbow pipes should be smooth, free from defects such as imperfections or oxide layers. The inner surface of the wear-resistant elbow shall be free from casting defects such as shrinkage cavities, porosity, and sand holes.