Flatness requirements for the bottom ring plate of the tower skirt
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When welding the base ring plate of a tower skirt, the manufacturer experienced deformation of the entire ring plate due to welding shrinkage; the levelness deviation was 7 mm. The diameter of the tower is 1300 mm. After consulting various standards and reference books, no specifications regarding the allowable levelness tolerance for this base ring plate could be found. It is uncertain whether the customer will accept it, as no relevant requirements seem to exist.
Typically, the flatness requirement for the bottom ring plate of a tower skirt is determined based on specific design requirements, industry standards, and customer specifications. Since you mentioned that no clear tolerance requirements could be found in the relevant specifications, it is recommended to proactively communicate this issue with the customer, describe the situation, and ask what specific requirements or acceptance criteria they have in mind. At the same time, some remedial measures can be considered, such as using adjustment shims or performing local heat treatment, to improve flatness. When the standards are unclear, proactive communication will help ensure that the product is accepted by customers. .
Reference can be made to HG/T20584, section 14.2 on dimensional tolerances, but the acceptable error range still needs to be discussed specifically with the customer