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

A lantern ring is an important component in a pump's sealing system, specifically designed to provide cooling to the packing and the shaft. When a pump operates, friction generated by the rotating shaft and the packing can lead to increased temperatures. The lantern ring facilitates the flow of cooling fluid, often a portion of the pumped fluid itself, through channels that allow for the dissipation of heat. This cooling effect helps to extend the life of the packing and ensures that the shaft remains adequately lubricated, preventing premature wear and failure.

Understanding the function of the lantern ring is critical for maintaining pump efficiency and longevity. By ensuring that the packing does not overheat, it helps maintain a proper seal, reduces leakage, and promotes optimal operation. This aspect is essential for the reliability of the pump, particularly in applications where temperature and pressure are critical to system performance.