HOW DOES A CENTRIFUGAL PUMP WORK?
The impeller is a key component in a centrifugal pump. It consists of curved vanes which can number anywhere from one (screw impeller) through to six. For fluids with entrained solids, an open or semi-open impeller backed by a single disc is better.
The fluid enters the centre of the impeller at its eye, exits between the vanes surrounding the eye, and is accelerated by centrifugal force out into the pump casing. The motor turns the impeller, which rotates at a high speed (typically 500-3000 rpm) to move the water through the system.
In a volute casing, the impeller is offset, effectively creating a curved funnel with an increasing cross-sectional area towards the pump outlet. This design causes the fluid pressure to increase towards the outlet.
Centrifugal Pump Performance is usually expressed in terms of the following of its characteristics:
Capacity (Q) – expressed in volumetric units in a given time i.e.; litres per second
Head (H) – measured in kilopascals (kPa) or metres (m)
Power (P) – kW
Speed (N) – revolutions per minute (RPM) or revolutions per second (RPS)
Efficiency (תּ) – as a ratio of useful work performed against power input
CENTRIFUGAL PUMP TYPICAL INSTALLATIONS
Centrifugal pumps are simple and efficient low-cost solutions to most low-pressure, high-capacity pumping applications involving low-viscosity fluids, such as water, solvents, chemicals and light oils. Typical applications include water supply and circulation, irrigation and the transfer of chemicals in petrochemical plants. Positive displacement pumps are preferred for applications involving highly viscous fluids such as thick oils and slurries, especially at high pressures, for complex feeds such as emulsions or biological fluids. They are also useful for accurate dosing when required.
Centrifugal Pump Videos
Watch short animated videos here showing the simple, effective concept of Centrifugal pumps:
How does a Centrifugal pump work?
CENTRIFUGAL PUMP FEATURES
6500 Series® end suction centrifugal pumps are based on the proven technology of Gorman-Rupp’s Prime Aire® and Prime Aire Plus® priming-assisted pump models. The 6500 Series was designed to extend Gorman-Rupp’s end suction centrifugal pump offering and to better serve applications where a suction lift is not required. A double volute mitigates shaft breakage and extends the life of the mechanical seals, wear rings and bearings, all while maintaining hydraulic efficiency, while a side access port allows for easy access to pump interior for inspection and clean out while the pusher bolt capability assists in the removal of the suction flange.
- High efficiency
- Alloy steel shafts with stainless steel options
- Dual sight gauges for bearing and seal cavities
- Smart Scroll® indexable discharge location
- Atmospheric vent
- Oversized bearings for longer bearing life
- Double volute on larger models
- Solids-handing models include side access for inspection and clean out
The Gorman-Rupp O Series pumps were originally designed for handling petroleum products. Later, O Series pumps were introduced into the industrial market for effective handling of solvents and similar liquids, as well as excellent clean liquids handling. The straight-in-suction design without a check valve eliminated entrance restrictions provides quick, reliable self-priming with few moving parts offering saving through minimal maintenance and increased efficiency. The O Series has a variety of seal configurations to choose from allowing it to handle a number of different liquids.
- Capital cost savings over wet well/ dry well constructions
- Low cost of ownership
- Easy access for monitoring or service
The Gorman-Rupp VG and VGH Series range of standard centrifugal pumps come in two styles. A general purpose style (VG) for clean liquids and a heavy duty style (VGH) for clean petroleum fluids as well as dirty water and mild abrasives.
The VG centrifugal pump has a cast iron casing and impeller, whereas the VGH centrifugal pump has a ductile iron casing, cast iron impeller with replaceable iron wear rings and a tungsten carbide/silicon carbide cartridge type mechanical seal with fluorocarbon elastomers.
- High efficiency
- Ethanol capable [with a seal upgrade]
- Low lifecycle costs
- Hand primer kit available in some centrifugal pump models
The EDUR range of Industry Bloc close-coupled centrifugal pumps are ideal for pumping water and other clean and slightly polluted fluids. They are compact in size, and available in a variety of materials of construction including cast iron, bronze and stainless steel.
Motors are either 2 pole or 4 pole, with IP55 enclosures, and insulation class F.
- All Iron, All Bronze and All Stainless Steel construction
- Flows to 165 l/s
- Heads to 90m
- Handle temperatures from -40oC to 140oC depending on model
- Handle viscosity to 115 cSt
- Handle solids content to 15%
- Single and double mechanical seals available
- Surface Mounted Pump
The EDUR range of multi-stage centrifugal pumps can deliver flows to 45 litres per second and heads to 300 metres. They are also available in a variety of materials (Cast Iron, All Bronze, All Stainless Steel and Super-Duplex) enabling them to pump corrosive fluids including seawater. These centrifugal pumps are ideal for booster systems, boiler feed and condensate systems, washing plants, water treatment and hardening systems.
Pumps can be close or long-coupled. Advantages include:
- All Iron, All Bronze, All Stainless Steel and Super-Duplex construction
- Flows to 45 l/s
- Heads to 300m
- Handle temperatures from -40oC to 160oC depending on model
- Single and double mechanical seals available along with gland packing and water cooled gland packing
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