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Recently, as Sany Heavy Industry’s 700-ton crane successfully placed the giant chlorination reactor, with a diameter of 8.4 meters and a height of 19.7 meters, in position, Lubei Engineering Company reached a key milestone in its first large-scale pressure vessel manufacturing project – the overall lifting of the chlorination reactor was completed successfully. This not only signifies a breakthrough for Lubei Engineering Company in the field of large-scale pressure vessel manufacturing but also achieves improvements in both quality and schedule. Lubei Engineering Company’s entry into the manufacturing of large pressure vessels this time marked several \"firsts\": it was the first time such high-chromium alloy steel was welded, and the first time that split-type pressure vessels were used in assembly. To ensure the smooth progress of the project, the company assigned specialized personnel to form a project team, which carried out strict oversight in various aspects such as drawing reviews, welding plans, lifting procedures, and quality requirements, all in order to guarantee the quality and safety of the chlorination reactors. Further innovations were made in terms of installation techniques; due to space constraints, a modular pressure vessel assembly method was used for lifting and positioning. First, the cylinder of the chlorination reactor was assembled and welded on-site, with the 108-ton bottom plate being lifted into place in one go. Then, the 136-ton cylinder was lifted as a whole, and finally, the welding between the bottom plate and the cylinder was completed. Advances were also made in material usage; for the first time, high-chromium alloy steel was used in the fabrication of pressure vessels. The project team was fully aware of the difficulties and high requirements associated with welding this material, and after numerous discussions with technical experts, they revised the welding procedure specifications to determine scientific and effective welding methods. The first-pass success rate for welding the chlorination reactors reached 98.4%, ensuring the quality of their construction and securing valuable time for the commissioning of subsequent production facilities.