A lantern ring is a

A lantern ring is a

• A. Spacer ring in a pump packing gland to improve seat water distribution
• B. Seal in a valve to prevent backflow
• C. Type of impeller used in centrifugals
• D. A ring used to hold bearings in place

Answer: (A)

A lantern ring is a spacer ring placed in a pump packing gland to improve how lubricating or cooling water from the gland is distributed to the packing. It sits between the packing rings and has passages that allow gland water to flow around the shaft, keeping the packing faces lubricated and cool. This helps maintain a better seal and reduces wear and leakage by ensuring water reaches the sealing surfaces evenly around the shaft. It’s not a valve seal used to prevent backflow, not an impeller, and not a ring used to hold bearings in place.

A lantern ring is a spacer ring placed in a pump packing gland to improve how lubricating or cooling water from the gland is distributed to the packing. It sits between the packing rings and has passages that allow gland water to flow around the shaft, keeping the packing faces lubricated and cool. This helps maintain a better seal and reduces wear and leakage by ensuring water reaches the sealing surfaces evenly around the shaft. It’s not a valve seal used to prevent backflow, not an impeller, and not a ring used to hold bearings in place.