What is the third type of pump curve in addition to head capacity curve and efficiency curve?

The third type of pump curve, in addition to the head capacity curve and the efficiency curve, is indeed related to horsepower. The horsepower curve indicates the amount of power required for the pump to operate at various flow rates and head conditions. This is crucial for understanding how much energy the pump will consume during operation, which ultimately impacts both the efficiency of the pump and the cost of running it.

Understanding the horsepower requirements allows operators to ensure that the pump is properly sized and that the motor driving the pump can provide the necessary power without overloading. This is critical for maintaining optimal performance and preventing equipment failure. The harmony between the horsepower curve and the other two curves (head capacity and efficiency) provides a comprehensive overview of the pump's performance envelope, making it an essential reference for operators and engineers.