Oilers/Plant Tenders (HHC) Civil Service Practice Exam

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When is it preferable to adjust the gland nuts on a pump?

While the pump is running
When the pump is stopped
Only during routine maintenance
Immediately after installation

The correct answer is: When the pump is stopped

Adjusting the gland nuts on a pump is best performed when the pump is stopped. This practice allows for a safe and controlled environment to make adjustments without the risk of injury from moving components or high pressures. When a pump is running, there is an increased risk of causing leaks, damaging internal components, or creating safety hazards due to unexpected movements or reactions from the process fluid. Stopping the pump ensures that it is at rest, allowing operators to carefully and effectively tighten or loosen the gland nuts to achieve the appropriate seal on the packing material, without the complications that can arise from vibrations or fluid movement. This enhances the reliability of the pump operation and helps maintain the integrity of the system. Routine maintenance does provide opportunities to check and adjust gland nuts, but it is specifically during the stopped state that these adjustments can be made safely and effectively. Adjusting immediately after installation is also typically not advisable, as components often settle or wear in during the initial run period and may require a readjustment after some operational time.