1)Cavitation is the formation and then immediate implosion of cavities in a liquid that are the consequence of forces acting upon the liquid. If the pressure of the system is reduced to such an extent that it drops below the vapor pressure of the fluid, as a result, some part of the fluid will vaporize forming bubbles or cavities. APPEARANCE: Cavitation normally appears in the form of rapid stream of bubbles which implode drastically as they enter a high pressure region. SOUND: Low level cavitation in pumps may be inaudible, but higher levels generate distinctive sounds that we can hear. Cavitation makes different sounds depending on the equipment and conditions. Following are some of the descriptions of cavitation sounds: Pumps • Crackling or sizzling • Hissing, rushing, swishing, or a static like sound similar to radio or television static. Valves • High pitch squeal • High pitch singing DIFFERENCE BETWEEN CAVITATION AND AIR RELEASE FROM WATER: Water contains 2% - 3% soluble air. As water temperature rises and/or pressure in the line
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