Cavitation means that cavities or bubbles are forming in the liquid that we're pumping. These cavities form at the low pressure or suction side of the pump, causing several things to happen all at once:
The cavities or bubbles will collapse when they pass into the higher regions of pressure, causing noise, vibration, and damage to many of the components.
We experience a loss in capacity.
The pump can no longer build the same head (pressure)
The pump's efficiency drops
.Water hammer (or, more generally, fluid hammer) is a pressure surge "increase" or wave caused by the kinetic energy of a fluid in motion when it is forced to stop or change direction suddenly. It depends on the fluid compressibility where there are sudden changes in pressure. For example, if a valve is closed suddenly at an end of apipeline system a water hammer wave propagates in the pipe. Moving water in a pipe has kinetic energy proportional to themass of the water in a given volume times the square of the velocity of the water
You to find your pressure and choose the pipe type accordijg to that calculations.