FAQ

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The pumped medium must be completely drained from the pump chambers.

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During frost periods, users often fail to ensure that the pumped medium is drained completely from the pump chambers.

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If the pump is operating too far to left on the curve, this simply means that the pump is delivering high pressure but at a flow rate that is low or non-existent. High pressure inside the pump stresses the impeller unit and thus increases pressure on the motor bearings.

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When a pump operates too far to the right on the curve, this simply means that the pump is delivering a flow rate greater than that for which it was designed. In other words:

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Unless specified to the contrary, the curves in the Grundfos documentation are specified for the density and viscosity of water at a temperature of 20°C (specific gravity = 1 and viscosity = 1).

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A cooling jacket, also referred to as a flow generator, ensures that there is always sufficient water flow across the motor surface in order to cool the motor.

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In a dry-running pump, the component that comes into contact with the medium (the wetted part) is separate from the motor.

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In this pump design, all rotating parts (shaft, rotor, impeller) are located within the can in the pumped medium. Cooling and lubrication is provided by the pumped medium.

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The pump's input power is the pump's power requirement under the present operating conditions.

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