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the factor affecting water hammer is the change in velocity
and according to the flow equation
Q = v*a
then the bigger pipes always has low velocities flow
so the change in velocity will be very haigh
change in pressure = density * wave propagation velocity * change of velocity
water hammering is due to vortex formation and air pocket rsidual resistance ,the larger the dia self dampening effect (difficult to maintain full pipe flow) is more so hammering of pressure waves between air and water is heavy specially at bends ,valve chambers change of size etc that's why we use air-release and excess pressure release valves in water transmission
They are not usually smaller - some amateur plumbed yours.
i think its because of more volume of the liquid.
more volume of liquid = more force=more pressure more water hammering
In addition to what my fellow engineers stated above, Water hammer is related to pressure fluctuation (either because of velocity changes or sudden demand change , pressure fluctuations are more likely to happen in bigger systems specially at the time of peak demand than in smaller systems.
Because usually higher water velocities are accepted for large pipes in order to reduce the capital cost of piping. This implies that the surge effect will be greater.
