The importance of NPSH (A) If we want to buy a pump or pump system design. If we do not take into consideration the values NPSH (A) Split into 2 damage. 1. If the pump NPSH value that we bought (R) greater than the NPSH (A) to make the pump can not work out or may cause the pump's lifetime is shorter than normal. 2. If the pump NPSH value that we bought (R) is less than the NPSH (A) very high pump prices, it will than necessary. (A) calculation of NPSH values. NPSH(A) = Hb-Hf-h-HvAccording to the post.Hb is the pressure of the atmosphere. If it's an open tank (1 bar (ab)), approximately 10 meters if Hb tank pressure 2 bar closed (ab) Hb = 20 m, etc.Hf is the Head Loss in the suction pipe.Hv is the vapor pressure of the liquid (vapour pressure) at a temperature that is used by the majority of the properties are available from the liquid.H is the distance between the surface of the pump failed. If the level of the surface of the liquid is higher than pump up h is negative (-), but the hakradap of the surface of the liquid is lower than pump up the positive (+) h.
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