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API 650 2021 7.5.3 Roundness
Radii measured at 0.3 m (1 ft) above the bottom corner weld shall not exceed the following tolerances:
Tank Diameter m (ft)
Radius Tolerance mm (in.)
< 12 (40) ± 13 (1/2)
From 12 (40) to < 45 (150) ± 19 (3/4)
From 45 (150) to < 75 (250) ± 25 (1)
� 75 (250) ± 32 (11/4)