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          Jiangsu Guoneng Machinery Technology Co., Ltd.
              Pump Series
              Valve series
            QUESTION
          What is NPSH? What Suction?

          When the centrifugal pump working fluid at the inlet of the impeller due to a certain vacuum pressure will produce liquid vapor, vaporized liquid bubbles in a strike movement of the impeller and other metal particle surface flaking, thereby undermining the impeller and other metal, this time called vacuum pressure vapor pressure, cavitation margin is the entrance to the surplus energy in pumping unit weight of the liquid has a vapor pressure of more than. In meters liquid column, with (NPSH) r expressed.

          Suction is the NPSH Δ / h: namely liquid suction pump allows a degree of vacuum, ie pump allows geometric mounting height. Units in meters. Suction = standard atmospheric pressure (10.33 meters) - NPSH - pipeline losses - Security amount (0.5) can be pressed on the standard atmospheric vacuum pipe 10.33 meters.

          Allow NPSH to prevent cavitation is produced, imported centrifugal pressure head movement must be greater than the sum of the liquid at the operating temperature of the saturated vapor pressure values of the head, the lower, the lower the permissible pump inlet pressure head, anti-cavitation Of course, the better ability.

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