What is the main purpose of priming a pump?

The main purpose of priming a pump is to replace air with water inside the pump. This process is crucial because pumps are designed to function with liquids, and the presence of air can hinder their performance or even lead to damage. Priming ensures that the pump is filled with liquid to create the necessary suction and head pressure needed for effective operation. Without proper priming, the pump may run dry, which can result in cavitation and mechanical failure. By eliminating air from the pump's interior, priming allows for smooth operation, efficient flow, and prevents potential complications that can arise from air locks or low suction conditions.