In preparation for long-term shutdown of a pump, what should be done?

When preparing for a long-term shutdown of a pump, disconnecting power and draining the pump is essential to ensure the equipment's safety and longevity. Disconnecting power prevents any accidental start-up that could occur while maintenance or inspections are performed. Draining the pump removes any residual liquid, which is crucial for several reasons: it prevents damage that could be caused by freeze-thaw cycles if temperatures drop, and it reduces the risk of corrosion and microbial growth in stagnant water. This action helps maintain the pump's internal components in proper condition when it is not in use, extending its operational life and reliability.

In contrast, simply turning off the motor does not protect the pump's internals from the issues associated with standing water. Closing a valve and leaving the pump under pressure can lead to unnecessary strain and potential damage to the pump's seals and components during inactivity. Draining only the discharge line neglects the pump itself, which can still contain fluid that may lead to deterioration. Thus, the comprehensive approach of disconnecting power and draining the entire pump is the best practice when shutting it down for an extended period.