Side wall lifting lug broken
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It is a equipment operating at atmospheric pressure, with dimensions DN4200*14 and a height of 12000; its approximate weight is 42 tons. SP-7 side wall lifting lugs were used in number of 2 for lifting. During the lifting process, the lugs broke – what could be the reason?
This post was last edited by tcdlb on 2025-3-10 16:52. Side wall lugs are generally used for vertical lifting. Furthermore, according to the provided data, under normal conditions, an angle of around 60° between the two lifting ropes can already lead to overload. Also, if the forces are unbalanced, a single lifting lug will bear most of the weight. It’s likely that the SP-7 side wall lifting lugs selected cannot handle the load. It is recommended to use four SP-9 lifting lugs.
The breakage of the side wall lifting lugs may be caused by the following reasons: 1. The material or design of the lifting lugs does not meet the requirements: either the material chosen is inappropriate and lacks the strength to support a weight of 42 tons, or there are defects in the design, such as dimensions or shape that are not suitable for the weight to be carried and the stress distribution. 2. Welding issues: There may be problems with the welding of the lifting lugs to the equipment; for example, the welds may not be strong enough or the welding quality may not meet the required standards, which can lead to the lifting lugs coming loose or breaking during lifting. 3. Overloading: The safe working load of the lifting lugs may be exceeded during the lifting process. 4. Uneven force distribution: If the force is not distributed evenly during lifting, it may cause some lifting lugs to bear excessive stress and break. To resolve this issue, it is first necessary to review the design and material selection of the lifting lugs to confirm that they meet the requirements for lifting such heavy equipment. Secondly, check the welding quality and the appropriateness of the lifting operations; if necessary, redesign and replace the lifting lugs to ensure the safety of the lifting process. .
Heavy equipment usually uses shaft-type lugs
Are there problems with the metallography? How to avoid it? It should be lifted using a hanger!
There must be an issue with the lifting method; using a lifting beam so that the lifting lugs are under force in a vertical upward direction would likely solve the problem
For such heavy equipment, and given that its diameter is also relatively large, tube-axis type lugs are used, along with lifting beams for support.
Without using a hanger, you’ll definitely need one sling for each lifting lug; with 2 lifting lugs, it’s like the center of the head yielding