This Standard ANSI B16.9 covers overall dimensions, tolerances, ratings, testing, and markings for wrought factory-made butt-welding fittings in sizes NPS 1/2 through 48 (DN 15 through 1200).
Click here for PDF ANSI B16.9 – 2012 – Factory-Made Wrought Steel Butt-welding Fittings>>>
ASME-ANSI-B16.9-Wrought-Steel-Butt-Weld-Fittings.pdf
If you want to check the detail standard content, you can buy from following link:
https://www.asme.org/products/codes-standards/b169-2012-factory-made-wrought-buttwelding