How should two pumps at a pumping station be rated for capacity?

The most effective approach for rating two pumps in a pumping station is for each pump to be capable of independently pumping the full capacity of the station. This configuration offers several advantages, primarily related to redundancy and reliability. If one pump were to fail, the other would still have the capacity to handle the total demand, thus preventing any disruption in service.

Additionally, having each pump rated for the full capacity allows for operational flexibility. In scenarios where demand is high, both pumps can work together to maximize flow rates. This setup is also essential for maintaining pressure in the system during peak usage times.

Other options suggest inadequate pumping capacity in various ways, which could lead to operational issues. For example, having each pump set at half the capacity would mean that neither pump can meet the total demand alone, necessitating full operation of both pumps at all times. Similarly, a configuration where one pump operates at double the capacity would lead to inefficiencies and potential wear on that pump. Both pumps rated below the station's capacity would compromise the system's effectiveness and resilience, particularly in emergency situations or during maintenance periods.