What is typically required before starting a rotary pump?

Before starting a rotary pump, priming the pump is essential to ensure that it can operate effectively. Priming involves filling the pump and the inlet line with the fluid that the pump is intended to move. This step is crucial because it removes air or any non-conductive fluids from the pump, allowing it to create the necessary pressure difference to draw in the liquid. Without priming, a rotary pump can fail to operate properly and may even become damaged due to running dry.

In this context, the other options may involve important maintenance or operational tasks, but they are not universally required before the initial start-up of a rotary pump. Cooling, injecting lubricant, and adjusting valves may be relevant in specific scenarios or with certain equipment, but the fundamental requirement to initiate function in a rotary pump is proper priming to ensure it can handle the liquid being pumped efficiently.