In parallel operations of pumps, what must be equal?

In the parallel operation of pumps, it is essential for the pump heads to be equal. This requirement ensures that the pumps can work together effectively to deliver a consistent flow rate into the system without causing flow imbalances or operational issues. When two or more pumps are operated in parallel, they should be able to share the system load equally, which is typically only possible if they operate at the same head.

If the pump heads are not equal, one pump may end up doing most of the work, leading to inefficiencies and the potential for the lesser performing pumps to be overwhelmed or even damaged. Therefore, matching the pump heads is a critical factor in maintaining system stability and ensuring that the pumps operate cohesively.

While factors such as pump capacities, types, and motor sizes can impact how pumps function together, they do not necessarily dictate the operational effectiveness in a parallel setup like equal head does. It's the head that allows for optimal flow and pressure conditions to be maintained across all pumps involved.