Try this: T [N] = ...
Published by Toth Szilard, CEO at SC Toth si Feur MHC SRL
Try this:
T [N] = 2PAsinΔ/2
Where: T - resulting force
P - Hydrostatic pressure in the pipe
A - Crossection of pipe
Δ - Angle of bend in pipe
This is the formula for the water hammer in pipe bends, for reductions or other such please contact me.