Take note of X, Y and Z values of mass-weighted average of static pressure from surface integrals. From there you can also find the direction of force vector. Also, I strongly recommend you to compare your results with the theoretical calculations. You can find informations about force calculations in following books:
Gulich - Centrifugal Pumps (Calculations are unnecessarily complicated but very accurate)
Hydraulic Institute - Centrifugal Pumps
Lobanoff - Centrifugal Pumps: Design and Applications (Very rough estimation but still useful)