Water Treatment Plant Operator Practice Exam

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What is the function of a lantern ring in a pump?

To stabilize the motor

To act as a spacer ring in a packing gland

The function of a lantern ring in a pump is to act as a spacer ring in a packing gland. This component is crucial in ensuring that the packing materials, which are used to seal the shaft of the pump, are properly engaged and positioned. The lantern ring allows for the injection of lubrication or flush water into the packing area, which helps to cool the packing, reduce friction, and minimize wear. By maintaining an optimal amount of packing around the rotating shaft, the lantern ring aids in preventing leaks and enhances the pump's overall efficiency and lifespan.

This function is particularly important in pumps that operate under high pressure or temperature conditions, as it ensures that the packing maintains an effective seal while allowing for some movement of the shaft. Proper implementation of a lantern ring can lead to improved operational stability and reduced maintenance requirements, ultimately contributing to better performance of the pump system.

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To control flow rate

To prevent cavitation

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