【Haichuan Chemical: An Eye-Opening Experience】Multiple Stunning Photos of Two Cranes Lifting the 1,429-Ton Quench Tower’s Fifth Floor in Zhejiang Refining & Chemical’s Phase II Project
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This post was last edited by Desert Fish on 2020-4-4 at 20:25. On April 1, 2020, CNNC Machinery used its own 3,200-ton and 1,350-ton crawler cranes as the main lifting equipment, with a 1,250-ton crane assisting in lifting the load; together, these cranes managed to lift the quench oil tower for Zhejiang Petrochemical’s Phase II project. This tower had a diameter of 12.1 meters, a height of 64 meters, and a net weight of 1,429 tons. The fact that two large cranes were able to lift such a large and heavy structure represents yet another breakthrough for CNNC Machinery!
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The planning and execution of this lifting operation presented numerous challenges: due to the heavy weight of the equipment, its great height, and the extremely limited space available, there were many difficulties associated with positioning the crane, moving it around, rotating it, adjusting its counterweights, and laying down the foundation boxes； The design for synchronous monitoring of dual-crane lifting; the capacity of the cranes and the limitations on lifting height pose serious constraints on formulating this approach ； The different models and lifting speeds of the two hosts make synchronized lifting command and control extremely challenging as well. In the face of the unfavorable conditions on site, the chief engineer of China Nuclear Machinery’s Zhejiang Petrochemical project personally developed a plan for lifting using two cranes. The project’s manager and deputy manager served as the chief and deputy commanders respectively; the crane operator handled the actual lifting operations, while experienced riggers were in charge of directing the lifting process. Highly skilled riggers were assigned to carry out these tasks, with the safety director overseeing everything throughout the process. Engineers assisted with measurements and marking, and strict adherence to the planned procedures was ensured, with close monitoring at every stage. Precise design, comprehensive planning, thorough attention to details, and proper monitoring of the lifting plan – coupled with strong equipment capabilities, accurate command, the high skills of drivers and workers, and strict and standardized safety management – all provided important guarantees for the successful completion of this lift. Following the successful lifting of a 1,100-ton cold water tower on March 17th, using its own large cranes, self-designed 1,500-ton lifting beams, lugs, foundation reinforcement, and lifting techniques by China Nuclear Machinery, the company once again succeeded in lifting a 1,429-ton piece of equipment, thereby demonstrating its strengths in terms of equipment, technology, and management capabilities.
As you can see, accidents involving two cranes almost always happen in succession: when one crane has a problem, the other one is often affected as well due to overload. The risks associated with lifting with two cranes are part of the overall risks of the lifting process. When undertaking a task that requires lifting with two cranes, it is essential to be extremely careful and pay close attention to the following points: 1. The models of the two cranes should be the same or as similar as possible ； 2. The two cranes must be directed by a single supervisor, who gives commands for lifting, lowering, and moving the arms; the speed of these actions should be kept as consistent as possible ； 3. When lifting a load using two cranes, the weight assigned to each crane shall not exceed 80% of its maximum allowable weight, and the total weight of the load shall not exceed 75% of the combined rated lifting capacity of the two cranes ； 4. A trial lift must be carried out. Especially when the customer is unable to tell you the exact weight of the load or when the weight is inaccurate. Of course, for beginners, participating in the trial lift using two cranes is probably the safest and most effective way. For lifting with two cranes, relatively rigorous calculations for load distribution are required; there are specific professional considerations regarding the lifting points, and high standards are also imposed on crane operators.
Lifting large equipment is simply thrilling to watch – it’s so grand and impressive!