(Rev.1) ISO Standard for General Tolerance of Dimension Inspection

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ISO 2768-1, General Tolerances - Part 1: Tolerance for linear and angular dimensions without individual tolerance indications

ISO 2768-2, General Tolerances - Part 2: Geometrical tolerances for features without individual tolerance indications

ISO 13920, Welding - General tolerance for welded constructions - Dimensions for lengths and angles - Shape and position

Rev.1 (Nov.10, 2021)
The tolerance class shall be stated on the drawing or the contract document. If the tolerance class is not specified, the following class shall be applied as per the common practice.

ISO 2768-1, Tolerance Class: m
ISO 2768-2, Tolerance Class: K
ISO 13920, Tolerance Class: B & F

The QC inspector cannot decide the tolerance class for the acceptance criteria. Prior to the dimension inspection, the QC inspector and the buyer's engineer shall discuss the applicable tolerance class. If the discussion is not possible due to the several reason, the applicable tolerance class shall be stated in the inspection report after the dimension inspection.

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(Rev.1) The dimension tolerance for the piping installation and tie-in point

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What is the applicable standard and tolerance class for the dimension inspection when the specific tolerance is not stated on the approved drawing? What is the standard tolerance for piping installation and the tie-in point? Regarding steel structures and related materials, if specific tolerances are not addressed in the approved drawing or approved ITP (Inspection and Test Plan), the construction tolerances specified in AWS D1.1 (specifically paragraphs 7.21, 7.22, and 7.23) will be applied. For piping, piping installation, tie-in points, and related materials, if specific tolerances are not addressed in the approved drawing or approved ITP, the construction tolerances specified in ASME B31.3 (specifically Paragraph 335, Erection and Assembly) will be applied. - (Rev.1) Typo & Editorial Errors Corrected
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