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When the absolute pressure dips below the vapour pressure, cavitation occurs. Why would dynamic pressure be taken into account in this case?

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Because dynamic pressure is contributing to the total pressure and, when checking for the possibility of cavitation all terms must be included or at least accounted for.

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  • $\begingroup$ So the total pressure, not the static pressure determines whether cavitation occurs? $\endgroup$ – Michael Nov 12 '17 at 12:18
  • $\begingroup$ One must account for the static head pressure along with any momentum associated pressure $\endgroup$ – takala Nov 17 '17 at 4:41
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According to Pump & Systems,

Note that suction pressure is stagnation pressure (total pressure); it includes velocity head. Adding velocity head puts all pumps on the same basis, otherwise a pump would require different amounts of NPSH when tested with different sizes of suction lines (assuming that suction pressure is measured in the suction line, which is normally the case).

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