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AWWA C228-2019
Stainless-Steel Pipe Flange Joints for Water Service—Sizes 2 In. Through 72 In. (50 mm Through 1,800 mm)
The purpose of this standard is to provide minimum material requirements and dimensions for a variety of stainless-steel flanges for attachment to stainless steel piping systems. Flanges covered in this standard are intended for use with stainless-steel pipe or appurtenances meeting the requirements of ANSI/AWWA C220, ANSI/AWWA C226, or other equivalent standards.
AWWA: American Water Works Association [awwa]