For some reason the site did not put my entire shout in your shout box. My last statement should read; In the low pressure systems, 150 lbs., that I worked with I always felt the water hammer was more a function of temperature fluctuations throughout the system than of cavitation.

Will answer you here rather than try to navigate my way back to the cavitation question. The fluid property behind the forming of cavitation is that the low pressure allows the water to turn into steam in a boiler application. In the low pressure steam systems,