Is the static pressure at the locations around the pump impeller represent the forces act on it?

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Hıdır Yankı Kılıçgedik

Yes.

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)