True or false, if a whirlpool forms over the strainer, air may be pulled into the hard sleeve, preventing, or losing the draft.

When a whirlpool forms over the strainer, it creates a situation where the water flow becomes unstable. This instability can lead to a drop in pressure at the inlet of the pump, and as a result, air can be sucked into the hard sleeve of the pump. This can prevent the pump from maintaining a proper draft, which is essential for efficient operation. When air is introduced, it disrupts the flow of water, potentially leading to cavitation and a loss of suction. Therefore, it is critical for pump operators to maintain awareness of whirlpool conditions and take corrective actions to prevent air intrusion into the system.