Also included are double casing (can or suction barrel intake - both diffuser and volute), and inline casing diffuser pumps. These pumps typically are driven by vertical electric motors or horizontal engines with right-angle gears. The standard also covers types, nomenclature and definitions for these pumps. Excluded from the scope of the document are:
- Vertical inline pumps.
- Horizontal centrifugal pumps mounted vertically.
- vertical, overhung impeller, close-coupled and submersible single-stage pumps.
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