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Comparison of spiral steel pipe specifications

Date:2021-01-06    View:324      Tag:Comparison of spiral steel pipe specifications
Comparison of spiral steel pipe specifications

     A. Deviation of spiral steel pipe: In the production process, because the actual size is difficult to meet the nominal size requirement, that is, it is often larger or smaller than the nominal size, so the standard stipulates that there is a difference between the actual size and the nominal size. A positive difference is called a positive deviation, and a negative difference is called a negative deviation.

     B. Spiral steel pipe tolerance: The sum of the absolute value of the positive and negative deviations specified in the standard is called tolerance, also called "tolerance zone".

The deviation is directional, that is, it is expressed as "positive" or "negative"; the tolerance is not directional, so it is wrong to call the deviation value "positive tolerance" or "negative tolerance".

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