1. Pipe OD: The outside diameter of roll grooved pipe.
2. Min wall thickness (T): This is the minimum allowable pipe wall thickness which could be roll grooved.
3. Gasket seat (A): It is measured from the pipe end to groove, for gasket seating.
4. Groove width (B): It shall be free of scale, dirt, chips, and rust that may interfere with proper coupling assembly.
5. Groove diameter (C): It shall be uniform groove diameter for the entire pipe circumference.
6. Groove depth (D): It is measured from pipe outer surface to groove outer surface.
7. Max flare diameter (F): It is maximum allowable pipe end flaring diameter.
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