Hi Hag,
Hydraulic transient must be caused by someting that disturb fluid steady state, such as, pump trip, valve closing,...
your are taking 7kg/cm2, is it a steady pressure? if it is transient surge pressure, it must be a time history file that is pressure vs time at a specified location, and you have to have points at each end of header, and tee, and 45degree elbow, those number normally calculated from hydraulic transient software such as, SPS, Impulse, ...
and then you can calculated unbalance force,
otherwise, how is your 7kg/cm2?
as Dan descripted your anchor,
and You also did not consider your pump thermal grow between your suction and discharge also pump elevation.
Regards,
Limin