🔍 Key Concepts

• Lantern ring location within a centrifugal pump stuffing box • Purpose of sealing / flushing liquid around the pump shaft • Difference between packing adjustment and sealing liquid distribution

💭 Think About

• Think about what flows through or around a lantern ring and why that flow is needed near the pump shaft • Ask yourself: is a lantern ring something you move to change leakage, or is it something that creates a path for another fluid? • Consider what problem the lantern ring is solving in the stuffing box: cooling, lubrication, sealing, or mechanical flexibility?

✅ Before You Answer

• Identify exactly where the lantern ring is installed in relation to the packing rings • Confirm what fluid passes through ports in the stuffing box to the area of the lantern ring • Make sure you distinguish between adjusting packing leakage (done by another component) and the function of the lantern ring itself