What are the standard classifications of pump impellers?

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Multiple Choice

What are the standard classifications of pump impellers?

Explanation:
The way pump impellers are classified is by how much of the vane passages are covered by shrouds (front and back discs). An enclosed impeller has both front and back shrouds, creating a tight, smooth flow path and higher efficiency, suited for clean liquids and higher head per stage. A semi-open impeller has a shroud on one side, with the other side open, which provides a balance: it still offers reasonable efficiency while allowing easier handling of small solids or wear trimming. An open impeller has no shrouds, so the flow path is very open; this makes it tolerant of solids and easier to clear, but at the cost of lower efficiency and lower head capability compared with enclosed types. So the standard set of classifications is enclosed, semi-open, and open, reflecting the presence or absence of shrouds around the vane passages.

The way pump impellers are classified is by how much of the vane passages are covered by shrouds (front and back discs). An enclosed impeller has both front and back shrouds, creating a tight, smooth flow path and higher efficiency, suited for clean liquids and higher head per stage. A semi-open impeller has a shroud on one side, with the other side open, which provides a balance: it still offers reasonable efficiency while allowing easier handling of small solids or wear trimming. An open impeller has no shrouds, so the flow path is very open; this makes it tolerant of solids and easier to clear, but at the cost of lower efficiency and lower head capability compared with enclosed types.

So the standard set of classifications is enclosed, semi-open, and open, reflecting the presence or absence of shrouds around the vane passages.

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