This nozzle is an elbow nozzle placed with the hub centerline normal to the radial plane.
This is the arrow originating from the vessel axis and pointing towards the hub centerline.
(OR1) - Orientation of Radial
The rotation is about the vessel axis, starting from the secondary.
(OR2) - Orientation of Flange Center Line
The rotation is about the vessel axis, starting from the radial arrow.
(N3) - Radial Distance to Hub Center Line
This is an unsigned offset along the positive direction of the radial. Refer to the Unsigned Distances section, CASE 1.