I am trying to find some dimensional data regarding large diameter steel line blanks. API 590 and ASME B16.48 only cover up to 24". Does anyone know of a standard that covers larger sizes?
You can get large diameter flange info from ASME B16.47-1996 which covers NPS 26 through 60" diameters. It covers class 75, 150, 300, 600 and 900.