Tolerances – Butt Weld Fittings
a All dimensions are in millimetres
b Tolerances are equal plus and minus except as noted
1 Out-of-round is the sum of absolute values of plus and minus tolerances.
2 This tolerance may not apply in localized areas of formed fittings where increased wall thickness is required to meet design requirements of para 2.2. (ASME B16.9)
3 The inside diameter and the nominal wall thicknesses at ends are to be specified by the purchaser.
4 Unless otherwise specified by the purchaser, these tolerances apply to the nominal inside diameter, which equals the difference between the nominal outside diameter
and twice the nominal wall thickness