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What are the application ranges of marine elbows?
Release time:
Oct 09,2020
Stamped marine elbows boast excellent overall performance and are widely used in fundamental engineering fields such as chemical industry, construction, petroleum, and light industry. These elbows are fabricated by stamping and welding from the same material as the pipe itself: a stamped and formed semi-circular elbow is first produced using a die, and then two such semi-circular elbows are assembled and welded together. Due to varying welding standards for different pipelines, these semi-finished products are typically fixed by spot welding in groups. During on-site installation, they are welded according to the specific pipeline’s welding requirements; hence, they are also referred to as bidirectional welded elbows. The blank for stamped elbows is either a flat plate or a developable curved surface, making material cutting straightforward and ensuring high precision easily. Assembly and welding are convenient, raw materials are easy to control throughout the manufacturing process, and the operation is relatively simple with no complicated procedures involved in the welding process.
Stamped marine elbows boast excellent overall performance and are widely used in fundamental engineering fields such as chemical industry, construction, petroleum, and light industry. These elbows are fabricated by stamping and welding from the same material as the pipe itself: a stamped and formed semi-circular elbow is first produced using a die, and then two such semi-circular elbows are assembled and welded together. Due to varying welding standards for different pipelines, these semi-finished products are typically fixed by spot welding in groups. During on-site installation, they are welded according to the specific pipeline’s welding requirements; hence, they are also referred to as bidirectional welding elbows. The blank for stamped elbows is either a flat plate or a developable curved surface, making material cutting straightforward and ensuring high precision easily. Assembly and welding are convenient, raw materials are easy to control throughout the manufacturing process, and the operation is relatively simple with no complicated procedures, thus making welding and assembly even more convenient.
The stamping process for marine elbows requires adherence to specific procedures and strict compliance with the corresponding process guidelines. In the early days, long-distance trunk pipelines operated by elbow manufacturers typically followed a point-to-point configuration: one initial station, several intermediate boosting stations, and one final distribution and delivery station. Crude oil was pumped from the storage tank at one gas station to the storage tank at the next. This was an open, non-closed transportation method.
Relevant experimental results demonstrate that the ultimate pressure borne by the local region of a marine elbow differs from that of a straight pipe. The ultimate pressure of an elbow is not only influenced by the magnitude of local wall thinning but also by the location of the thinning and the bending radius. Moreover, the extent of wall thinning at the elbow significantly affects its ultimate load-carrying capacity. Based on finite element analysis, a calculation formula for the ultimate pressure of locally thinned elbows has been derived. The results obtained from this formula closely match those from previous finite element analyses as well as experimental findings. This formula can be applied to the safety assessment of locally thinned elbows, filling a gap in existing technologies. Furthermore, finite element analysis enables the investigation of the interference effects resulting from multiple instances of local wall thinning in marine elbows under internal pressure. The results indicate that the interaction among multiple instances of local thinning is influenced not only by the distance between thinned areas but also by the depth of the thinning.
Marine elbows, classified according to their curvature radius, can be divided into long-radius marine elbows and large-diameter marine elbows. The main standards for large-caliber elbows include national standards, electrical standards, Sinopec standards, marine standards, Japanese standards, and American standards. These elbows boast advantages such as smooth inner walls, low flow resistance for hot media, excellent resistance to acids and alkalis, long service life, and easy installation. They are simple to manufacture and fully meet the needs of architects and structural designers. Moreover, they effectively address the issue of wear in straight-seam elbows—a longstanding hidden danger that has consistently threatened production safety.
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