MSS - Manufacturers Standardization Society of the Valve and Fittings Industry.
Scope
This Standard Practice covers the dimensions which define the interface between drilling/tapping machine adapters and tapping valves (known as a ??joint??); including clearances for the pilot drill and cutter. The positioning recess and mating raised face of the connecting flanges or end connections@ between machine adapters and tapping valves@ serve to ensure proper alignment of the machine adapter onto the tapping valve@ without affecting the strength of the joint. Only flanged@ mechanical joint@ push-on@ asbestos-cement@ and radial compression connections are included within this Standard Practice. This Standard Practice covers dimensions for the special connecting flanges indicated in Section 1.1@ of nominal sizes from NPS 2 through NPS 60 (DN 50 through DN 1500)@ for water and sewerage systems. Pressure and pressure-temperature ratings are beyond the scope of this Standard Practice.