Question

question 56 of 100 · multiple choice

a shaft sleeve is used on a pump shaft to?

a reduce wear on packing

b protect shaft from wear

c permit use of smaller packing

d eliminate the lantern ring

Explanation:

Identify the primary function of a shaft sleeve

A shaft sleeve is a metal cylinder placed over a pump shaft to protect the shaft from wear, corrosion, and erosion caused by packing or mechanical seals.

Evaluate the given options

• Option A: Packing is a consumable material designed to wear down; the sleeve protects the shaft from it, not vice versa.
• Option B: The sleeve acts as a sacrificial, replaceable barrier to protect the expensive pump shaft from wear.
• Option C: Packing size is determined by the stuffing box dimensions, not the sleeve.
• Option D: Lantern rings are used for lubrication/cooling and are not eliminated by a sleeve.

Answer:

• (A) reduce wear on packing
• (B) protect shaft from wear (Correct answer)
• (C) permit use of smaller packing
• (D) eliminate the lantern ring