MSS - Manufacturers Standardization Society of the Valve and Fittings Industry.
Scope
This Standard Practice establishes flange and gasket dimensions which define the interface between tapping sleeves and tapping valves. This Standard Practice establishes dimensions for these special connecting flanges and gaskets of nominal sizes from NPS 2 through NPS 60 (DN 50 through DN 1500) for water and sewerage systems. This Standard Practice establishes pressure-temperature ratings for the connecting flanges.