For what duration should priming occur for 1250 GPM pumps?

Priming is a critical process in ensuring that a fire pump can effectively draw water and deliver it to the fire suppression system. For a pump rated at 1250 gallons per minute (GPM), priming should occur for a duration of 30 seconds. This time frame allows sufficient opportunity for the pump to create a vacuum and remove air from the pump casing and suction line, thereby filling it with water.

If priming is executed for less than the optimal duration, there is a risk of air remaining in the system, which can lead to cavitation and inefficient pump operation. By adhering to the 30-second priming guideline, operators increase the likelihood of successful water delivery at the required flow rate, ensuring effective firefighting capability and system reliability under pressure.