Why do rectangular rounded corrugated expansion joints have rounded corners

Why do rectangular rounded corrugated expansion joints have rounded corners

         In the D2000 standard, most of the rectangular rounded corrugated expansion joints are full-height waves or half-height waves. According to the "CE" standard and general products, a new type of power plant flue duct flexible pipe developed in accordance with the special conditions of power plants in China. This product is a power plant, Metallurgical, cement, and petrochemical equipment systems are an important part of the operation of large cross-sectional area flue gas medium transmission pipelines. Compared with similar types of single oblique angle, double oblique angle, bellows angle, and low wave tangent point in the geometric nonlinear deformation caused by temperature and load The working characteristics and quality of the products with small rounded corners are actually the same as those of rectangular direct corrugation, that is, the wave height and wave distance are different, and the same ripple compensation amount will be different. The rounded corners are deformed smoothly, reducing internal stress, and are suitable for hot air and flue gas pipes.

         The corners of the rectangular rounded corrugated expansion joint are formed by a large arc transition to form a rectangular section. The stress level at the corners of the corners is reduced, and the dead corners of deformation and the uniform deformation of the product during online operation are eliminated, thus reducing the risk of regional high-stress damage and lengthening The service life of the product. Rectangular rounded corrugated expansion joints reduce the thrust of the piping system under the condition of not losing stability and maintaining basic working rigidity, improving the thermal compensation capability of the product, and reducing the input cost of flexible parts in pipeline construction. Due to the adaptable change of geometry, this product can work reliably in a benign force system under the action of applied tensile stress, compressive stress and alternating stress, avoiding local stress risk areas, and in the atmosphere containing H2SO, CO, H2 flue gas During medium work, it effectively improves the deterioration trend of stress corrosion cracking (SEE) and corrosion fatigue fracture (CFF), and increases the allowable number of thermal cycles of the product without affecting the service life. The rectangular rounded corrugated expansion joints are in corrugated When the pipe is welded, the welding seam can be far away from the arc tangent point. When the rectangular unilateral length is less than 2M, the welding seam can be reduced by one, and the amount of welding seam misalignment is greatly reduced. The cross-sectional shape of the corrugated pipe and the corrugated package line at any position of the product The length error is extremely small, the corrugated shape, and the stretch-bending shape are plump and smooth. It meets the theoretical criterion of the good maximum fatigue life of the bellows. The corners of the rectangular rounded corrugated expansion joints are welded and reinforced with arc steel plates, and the joints are made of channel steel as structural parts, which enhances the structural strength of the product and stretches the whole as a whole.