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#Rotor · 12-01-2003, 01:37 PM

the way I understand it.... head it a result of a couple of things, or characteristics of the pump.

1: tolerance in the impeller casing, IE. how much space is there for liquid to squeeze by the impeller.

2: The diameter of the impeller.

3: rotational Speed

#1 is obvious, so is #3

#2 includes a number of other factors too... Such as the power/torque of the motor. As the diameter of the impeller increases, the amount of kinetic energy transferred to the liquid by the impeller, as a result of the centrifugal force exerted on it as it goes through the pump, increases dramatically. This in turn requires more power from the motor (nothing is for free).... Torque in Particular becomes an issue, as the diameter of the impeller increases.

I think of it this way, you have a ball and attached to it, is a piece of rope. You want to through this ball as high up into the air as you can....
What will give you the best result.... holding the rope at 10% , 30% 70% or 100% of it's length, while you swing it.....

by the way.... this only pertains to centrifugal pumps....

12-01-2003, 01:37 PM	#5
#Rotor Cooling Savant Join Date: Feb 2002 Location: Dione, sector 4s1256 Posts: 852	the way I understand it.... head it a result of a couple of things, or characteristics of the pump. 1: tolerance in the impeller casing, IE. how much space is there for liquid to squeeze by the impeller. 2: The diameter of the impeller. 3: rotational Speed #1 is obvious, so is #3 #2 includes a number of other factors too... Such as the power/torque of the motor. As the diameter of the impeller increases, the amount of kinetic energy transferred to the liquid by the impeller, as a result of the centrifugal force exerted on it as it goes through the pump, increases dramatically. This in turn requires more power from the motor (nothing is for free).... Torque in Particular becomes an issue, as the diameter of the impeller increases. I think of it this way, you have a ball and attached to it, is a piece of rope. You want to through this ball as high up into the air as you can.... What will give you the best result.... holding the rope at 10% , 30% 70% or 100% of it's length, while you swing it..... by the way.... this only pertains to centrifugal pumps.... __________________ There is no Spoon....