Multi-stage pumps are designed to generate high-pressure water flow by passing water through multiple impellers (stages) within the pump casing. These pumps are commonly used in high-rise buildings to ensure that there is sufficient water pressure at various levels, especially for fire protection systems such as fire sprinklers and standpipes. In the case of a multi-stage multi-outlet pump, it means that the pump is designed to supply high-pressure water to multiple outlets or points within the building. This is crucial in high-rise buildings where the water pressure needs to be maintained at various levels and across multiple fire protection systems. These pumps are essential for ensuring that water can reach all areas of a tall building, including the upper floors, to fight fires effectively.