What is the minimum acceptable capacity for a centrifugal fire pump in relation to the connected fire protection system?

The minimum acceptable capacity for a centrifugal fire pump in relation to the connected fire protection system is 150% of the rated capacity. This requirement is put in place to ensure that the fire pump can adequately supply water to the fire protection system under various conditions, including during peak demand scenarios.

Fire protection systems are designed with the potential for simultaneous use of multiple sprinkler heads or other water delivery points. By specifying 150% of the rated capacity, the standard ensures that even if other factors such as friction loss, system pressure drops, or unexpected demand spikes occur, the pump will still provide sufficient water flow to maintain the system's effectiveness in a fire emergency. This level of capacity helps ensure that safety standards are met, protecting lives and property.

The choices that suggest less than 150% do not provide the necessary redundancy and safety margin that are critical for effective fire protection. If the pump operated at only the rated capacity or less, it could lead to a failure to deliver adequate water when most needed, significantly compromising the effectiveness of the fire suppression system.