Table of Tolerence2
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           Table of Tolerance ASTM A530/A530M

           ASTM A312 Pipe

             Standard cross-section and weight tolerances (ASTM A530/A530M)

 

NPS Outside Diameter (OD)¹ Wall Thickness (t)²  Weight ³
Under Over Under
Over Under Over
in mm in mm % % % %
⅛ – 1½ 0.031 0.8 0.015 0.4 12.5 20 3.5 10
> 1½ – 4 0.031 0.8 0.031 0.8 12.5 20 3.5 10
> 4 – 8 0.031 0.8 0.062 1.6 12.5 22.5 3.5 10
> 8 – 12 0.031 0.8 0.093 2.4 12.5 22.5 3.5 10
> 12 – 18 0.031 0.8 0.093 2.4 12.5 22.5 5 10
> 18 – 26 0.031 0.8 0.125 3.2 12.5 22.5 5 10
> 26 – 34 0.031 0.8 0.156 4.0 12.5 22.5 5 10
> 34 – 48 0.031 0.8 0.187 4.8 12.5 22.5 5 10

 

                Notes
                1. Includes ovality tolerance except for thin wall pipe (ie t>3% OD)
                2. Min wall thickness = Nominal wall thickness (t) x 0.875. Not applicable if filler metal added
                3. For non standard pipes W (lb/ft) = 10.68 (OD-t)t, or W (kg/m) = 0.02466 (OD-t)t
                   ● Standard Cut Lengths
                   Pipe ordering alternatives are:
                   –– Random Standard lengths are in the range 15 to 24 feet. Shorter lengths are agreed with the purchaser.
                   –– Specified Lengths Cut lengths as specified, with end finish also specified
                  ● Length tolerances
                  No pipe shall be shorter than specified. No pipe shall be more than ¼ in (6mm) longer than specified. Tighter tolerances may be specified, e.g. for bevelled pipe
                  ● Straightness
                  All finished pipe shall be reasonably straight. For metal-arc welded pipe maximum deviation from straight = ⅛ in (3.2mm) in 10 ft (3 m)