A priming pump is a device on an emergency fire pump that removes air from the pump's casing, allowing it to draw water and operate effectively. These systems are crucial, especially for centrifugal pumps that cannot operate with air in the casing. Common priming methods include using a self-priming unit, like a liquid ring vacuum pump that engages when the main pump starts, or a simpler hydraulic or manual priming system with valves and a hand pump. How it works 1.Initial state: The priming pum