Positive tolerance on Pipe wall thickness

[gafoorkti]

Please can somebody tell me about positive tolerance on pipe wall thickness (ASTM A106 Gr. B). As per my interpretation, ASTM A106 mentions only about negative tolerance i.e minus 12.5%.

Example: Pipe thickness for a schedule 80 3'' pipe (carbon steel) is 7.62mm whereas received pipe with wall thickness 8.5mm (i.e approximately 112.5% WT).

Please advise me if I'm wrong.

 

[tommac]

ASTM A106 refers to ASTM A530 General Requirements for Specialized Carbon and Alloy Steel Pipe, which lists the tolerances for wall thickness, OD, ID, etc.