What should an MPO do if they notice an unusual decrease in pressure during operation?

The most appropriate action for an MPO to take when noticing an unusual decrease in pressure during operation is to check the intake for blockages. This decrease in pressure could indicate that there is a problem with the flow of water into the pump, which can be caused by obstructions in the intake line, debris, or other issues affecting water supply. By inspecting the intake, the operator can identify and resolve any blockages, ensuring that the pump operates efficiently and effectively.

Taking this step is crucial because it allows the MPO to address the root cause of the pressure drop rather than just compensating for it. Addressing the issue directly can prevent further complications or even damage to the pump system.

While adjusting engine RPM or shutting down the pump might seem like viable options, these actions do not directly address the problem of intake blockage and may lead to further issues if not approached with a focus on checking the intake first. Evacuating the area is also a drastic measure that should only be considered in cases of immediate danger and would not be necessary solely due to a decrease in pressure.