Pumpekurve

The **Pumpekurve** (German for "pump curve") is a graphical representation used in fluid dynamics and mechanical engineering to illustrate the performance characteristics of a centrifugal pump. This curve plots the relationship between the flow rate (measured in cubic meters per hour or liters per second) and the head pressure (measured in meters of liquid or kilopascals) that the pump can generate under varying conditions.

The Pumpekurve is typically derived from manufacturer test data or calculated using pump design parameters. It shows how the pump’s efficiency, power consumption, and net positive suction head (NPSH) requirements vary with changes in flow rate. The curve is essential for selecting the appropriate pump for a specific application, as it helps determine whether the pump can meet the required system demands.

Key features of a Pumpekurve include the **best efficiency point (BEP)**, where the pump operates most efficiently with minimal energy loss. Operating too far from this point can lead to reduced performance, increased wear, or even pump damage. The curve also indicates the **shut-off head**, the maximum pressure the pump can produce with no flow, and the **zero-flow head**, which is typically lower due to friction losses.

In practice, the Pumpekurve is compared with the **system curve**, which represents the resistance of the piping and other components in the system. The intersection of these two curves determines the actual operating point of the pump under given conditions. Adjustments such as valve throttling or pump speed control can shift the operating point to optimize performance.

Proper interpretation of the Pumpekurve ensures efficient and reliable pump operation, reducing energy costs and maintenance requirements. It is commonly used in industrial, municipal, and HVAC systems where centrifugal pumps are employed.