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Functions of a Pump
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- Transfer fluid between two points.
- Produce required flow rate.
- Produce required pressure.
Pump - Facts
- Pump changes both velocity and pressure of the fluid.
- Pump only adds to the system energy.
- Power supplied to the pump is to transfer fluid at specified flow rate and pressure by overcoming resistance in the pump and the system.
- A pump does not create pressure, it only provides flow. Pressure is just an indication of the amount of resistance to the flow.
Pumps and Viscosity of Fluid Handled
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- Viscosity of the fluid pumped must be within the range specified in the pump design.
- Reciprocating Displacement pumps can handle any required viscosity.
- Rotary Positive Displacement Pumps ( Common- Gear and Screw ) are used for intermediate range of viscosities.
- Centrifugal Pumps are used for Medium to Low range of viscosities.
- Onboard ships, permission should be obtained before any Fluids are moved, which might affect the stability of the ship.
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