What causes a loss of prime or draft in a pump?

The loss of prime or draft in a pump is primarily caused by air leaks and whirlpools at the source. When air enters the pump system, it disrupts the continuity of the fluid, leading to an inability to maintain the necessary suction (prime) to draw water into the pump. Similarly, whirlpools can create a situation where the pump unintentionally draws in air instead of water, further exacerbating the loss of prime.

In scenarios where there are air leaks within the suction line or at fittings, air mixed with the water can significantly reduce the pump's effectiveness. This results in an incomplete filling of the pump casing with liquid, which ultimately prevents the proper operation of the pump. Maintaining a sealed and properly primed system is crucial to avoid these issues.

While other factors such as high pressure, low water temperatures, or pumping too quickly might affect pump performance, they do not directly cause a loss of prime as air leaks and whirlpools do. Understanding these dynamics helps ensure proper operation and maintenance of pumping systems.