Sizing a pump is not simply about choosing a machine that can “move the liquid.” It is about matching the pump to the system so that the required flow is delivered reliably, efficiently, and safely over the long term. A pump that is too small will fail to meet demand. A pump that is too large may waste energy, create noise and vibration, damage equipment, and operate far from its best efficiency point. Good pump sizing is therefore both a technical calculation and an engineering judgment.