Introduction to specifications and models of 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 tortoise-shell mesh. The material for wear-resistant elbows must be selected based on the actual operating conditions. II. A detailed explanation of the models of wear-resistant elbows is provided; these models include the angle, bending radius, thickness of the steel pipe, and thickness of the ceramic material. For example, 90° wear-resistant elbow, dn150*8, R=1000, ceramic thickness of 4mm, 26 pieces. The elbow angle is 90 degrees; there are also 60-degree, 45-degree, and 30-degree elbows available. The bore diameter of the elbow is 150 mm, with a thickness of 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 flow passage.
In ceramic-lined elbows, r represents the bending radius of the elbow; the larger r is, the longer the elbow and the greater its bend. The smaller the radius of a ceramic wear-resistant elbow, the more curved it becomes, and the greater the concentration of impact force. The bending radius of ceramic-lined elbows is generally designed to be 5d-7d, which improves the quality of these elbows, extends their service life, and enhances their wear resistance.
The takeover length and inner diameter of the pipeline shall meet the requirements of the tenderer; before producing the products, the tenderer must give approval before production can proceed. Schematic: 3.4 Ensuring product performance such as the concentricity and overall quality of bimetallic composite wear-resistant elbows. The elbow should have good thermal shock resistance; under conditions of rapid temperature changes or during welding, it should prevent the inner layer of the wear-resistant pipe from cracking or peeling off due to inconsistent expansion and contraction between the inner and outer layers. 3.5 The inner and outer surfaces of the wear-resistant elbow should be smooth and clean, free from burrs, rough edges, excess material or missing material, as well as cracks, porosity or bubbles ； The coating should be even and capable of withstanding the environmental conditions at the installation site; the direction of flow of the medium should be indicated on the surface at the time of delivery. 3.6 The dimensional tolerances shall comply with the provisions of GB3092, GB8162, and GB8163, as well as the requirements specified in the product order agreement. The thickness deviation of the lining layer shall be ≤ +1.2 mm; the roughness of the inner wall shall not exceed 1%. The weight of the elbow shall vary by within ±3% compared to the values shown in the technical specifications, while the allowable deviation in the bending angle is ±0.5°. The roundness tolerance of the elbow’s cross-section shall not be greater than 6%. 3.7 The steel pipes used for composite pipes can be spiral-welded pipes or straight-seam pipes, and their properties shall comply with the requirements of GB3092, GB8162, and GB8163. Remove slag from the cross-section or edges of the steel parts to be welded after thermal cutting. 3.8 The inlet and outlet of wear-resistant elbows shall be equipped with wear-resistant straight pipe sections. The wear-resistant elbow and the corresponding straight pipe sections before and after it should be delivered as a single unit. The straight pipe sections at both ends, as well as the ellipticity within the pipes, must meet the **requirements and the acceptance standards of the power industry. The connection between the elbow and the pipeline is carried out using manual arc welding; the bidder shall carry out welding process preparation on the pipeline welding surfaces and prepare the grooves as required to meet the specifications for manual arc welding on site. There should be no special requirements for field welding, so as to ensure good weldability of the product when welded at ambient temperature on site. The butt welds in the factory are not allowed to have defects such as cracks, pores, or bruises.