Answer:
From the online help:
Specify the global offset values DX, DY, and DZ from the reference point to define the location of the center point of the pump. Since AutoPIPE cannot display a point for the center of the pump, the pump center is defined relative to the suction nozzle or discharge nozzle.
Example: ANSI 4x3 (A40)
See Also
Modeling Rotating Equipment (Pumps, Compressors, Turbines)
Modeling Approaches in AutoPIPE