Outside Diameter (OD) of pipes is different for different pipe wall thicknesses. This is in sharp contrast w.r.t. ASME B36.10M & ASME B36.19M, which designates a unique pipe Outside Diameter (OD) value for each Nominal Pipe Size (NPS). Outside Diameter (OD) Controlled Pipe follows ASME B36.10M & ASME B36.19M.
References:
http://bibekbhattacharyya.blogspot.com/2014/07/implications-of-id-controlled-pipe.html
