We’ll be looking at how:

• Water moves through the pump case

• Efficiency is achieved

• Damage can occur

• Wear rings can help

Wear Rings

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Something you wear? Something you wear? Or something that Or something that prevents Wear?prevents Wear?

• Water moves from high to low-pressure zones

• Some water is re-pumped

• This reduces pump efficiency

Water Movement Inside the Case

Low-Pressure Zone

High-Pressure Zone

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Limiting recirculation improves efficiency

Physical separation between high and low-pressure zones

Improving Efficiency

Low-Pressure

Zone

High-Pressure

Zone

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Physical separation by moving impeller closer to suction port

Improving Efficiency – Semi-Open Impellers

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• Reduced gap between volute and impeller bull-nose

• The bull-nose: suction-side protrusion on the impeller

Improving Efficiency – Closed Impellers

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Re-pumped water abrades the volute and impeller.

Efficiency reduced

But there’s a solution

Damage to the Case

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Wear rings are installed in the volute case

More durable than volute itself

Often designed to be replaced

Casing Wear Rings

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Wear Ring Materials

Many wear-ring materials

Commonly made from stainless steel and bronze

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Wear rings can be replaceable or non-replaceable

Replaceable variety not cost-effective for smaller pumps

Large pumps usually have replaceable wear rings

Replaceable/Non-Replaceable

No thanks

Used wear rings,

make me an offer

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Apply Your Knowledge

Water that gets re-pumpedC

BNarrow gaps between impeller and volute

A Wear rings

What is one cause of decreased pump efficiency?

Apply Your Knowledge

What is one cause of decreased pump efficiency?

Water that gets re-pumpedC

BNarrow gaps between impeller and volute

A Wear rings

Sorry, that’s incorrect

LET’S REVIEW

Apply Your Knowledge

What is one cause of decreased pump efficiency?

Water that gets re-pumpedC

BNarrow gaps between impeller and volute

A Wear rings

Sorry, that’s incorrect

LET’S REVIEW

Apply Your Knowledge

What is one cause of decreased pump efficiency?

Water that gets re-pumpedC

BNarrow gaps between impeller and volute

A Wear rings

That is correct !

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