🔍 Key Concepts

• Shaft sleeve purpose: a removable liner that protects the pump shaft from wear, usually where packing or a seal contacts the shaft. • Location of the stuffing box/packing or seal area on a centrifugal pump cross‑section. • Difference between the solid shaft itself and a sleeve fitted over it and secured by a collar or nut.

💭 Think About

• On the illustration, where would the packing, gland, or seal logically sit in relation to the pump casing and the shaft? • Which numbered part clearly appears to be a thin cylindrical piece slipped over the main shaft, rather than the main shaft or a bearing housing itself? • Look for a component that stops at the stuffing box area and is held in place by another part, rather than running the full length of the pump.

✅ Before You Answer

• Verify which item number surrounds the shaft only locally in the stuffing box/seal region, not along the entire shaft length. • Confirm that the suspected part is directly in contact with where packing or a seal would rub, indicating it is a wear surface. • Make sure you are not confusing the shaft sleeve with the shaft, bearings, or impeller hub; the sleeve should be a separate, removable ring or tube on the shaft.