Wearing rings in a pump is intended to

Wearing rings in a pump is intended to

• A. Concentrate wear on an economically replaceable part
• B. Hold the shaft in place
• C. Keep the impeller in place
• D. Wear out rings instead of sleeves

Answer: (A)

Wear rings provide a sacrificial, replaceable wear surface in a pump. They are positioned where contact between moving and stationary parts would occur, so wear concentrates on these rings rather than on more expensive components. This keeps the overall pump downtime and maintenance costs down, since worn rings are relatively cheap and easy to replace while protecting the impeller, shaft, and sleeves from premature wear. B and C describe functions related to locating or retaining the shaft or impeller, which are handled by bearings, keys, and fasteners, not wear rings. D is partially true that wear rings are meant to wear before sleeves, but the primary purpose is to have a controllable, replaceable wear surface to protect the more costly parts and maintain efficiency.

Wear rings provide a sacrificial, replaceable wear surface in a pump. They are positioned where contact between moving and stationary parts would occur, so wear concentrates on these rings rather than on more expensive components. This keeps the overall pump downtime and maintenance costs down, since worn rings are relatively cheap and easy to replace while protecting the impeller, shaft, and sleeves from premature wear.

B and C describe functions related to locating or retaining the shaft or impeller, which are handled by bearings, keys, and fasteners, not wear rings. D is partially true that wear rings are meant to wear before sleeves, but the primary purpose is to have a controllable, replaceable wear surface to protect the more costly parts and maintain efficiency.