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A. Dynamic:
1. Centrifugal: Axial (Single and Multistages - Closed and Open), Mixed (Radial - Single and Double Suction - Open, Semi-open and Closed) and Peripheral.
2. Special Effect: Jet, Gas Lift, Hydraulic Ram and Electromagnetic.
B. Displacement:
> Reciprocating:
1. Piston Plunger (Steam and Power).
2. Diaphragm (Simplex and Multiplex).
> Rotary:
1. Single Rotor (Vane, Piston, Flexible Member, Screw and Peristaltic).
2. Multiple Rotor (Gear, Lobe, Circumferential Piston and Screw).
centrifugal pumps can be claSSIFIED ACCORDING TO IMPELLER TO
1-RADIAL flow impeller
2-axial flow impeller
3-mixed flow impeller which compined radial and axial flow principle
also empeller can be classified to
1-closed impeller
2-open impeller
semi open impeller
also centrifugal pump can be
1-single stage pump
2-multi stage pump
1 by pupmp assembly , pump stages , pump imperal construction , pump suction , pump instalation ,pump flow types,
1-RADIAL flow impeller
2-axial flow impeller
3-mixed flow impeller
centrifugal pump can be
1-single stage pump
2-multi stage pump
In addition to above answers, here's a useful diagram to simplify its classifications:
http://www.pumps.org/content_detail.aspx?id=2212
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