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www.spppumps.com
Water & Industry Business UnitPresented By: Stuart Wallis
[email protected] 07720 498 333
www.spppumps.com
• Introduction• SPP• Our design ethos• Centrifugal pumps types and construction• Centrifugal impeller types• Centrifugal pump curves• Information needed for selection (WIMES datasheets)• Pump & system interaction• Why we need to select the pump at its BEP • Any questions
Agenda
www.spppumps.com
1875 – Founded as Pulsometer Engineering.
Brief History of SPP Pumps
1901 ‐ Moved from London to new premises in Reading, UK.
Over 140 years of experience & expertise
1961 ‐ Joined Sigmund Pumps of the UK and became known as Sigmund Pulsometer Pumps, SPP for short.
1986 ‐ All UK manufacturing moved to Coleford
2003 ‐ PresentSPP was acquired by our current parent company, Kirloskar Brothers Limited (KBL).
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• Developed for the water utility market• 21st century commercially aware end users• To cover the majority of applications • Highly evolved ‐ not a new product• Benefits pre & post installation• Highest quality & longevity• Greatly reduced energy cost• Very reliable• Minimised performance degradation
Pump design – our ethos
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Types of centrifugal pumps
Types of centrifugal pumps
single stage pumps
Three + stage pumps
End suction, split case, vertical turbine
End suction, split case, vertical turbine
multistage pumps, vertical turbine
two stage pumps
Can be mounted vertical or horizontalExcept the vertical turbine pumps
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• Fluid enters the impeller at its axis (the ‘eye’) and exits along the circumference between the vanes.
• The impeller, on the opposite side to the eye, is connected through a drive shaft to a motor and rotated at high speed (typically 750 ‐3000rpm).
• The rotational motion of the impeller accelerates the fluid out through the impeller vanes into the pump casing.
• The purpose in this pump design is to translate the fluid flow into a controlled discharge at pressure.
• 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
How does a centrifugal pump work
Double Row Thrust Bearing
Serrated Wear Ring
Stainless Steel Impeller
Short Bearing Span
Throttle Bush
Efficiency Enhancing Coating
Stainless Steel Shaft
Externally Removable Bearing Housing
Impeller Lock Nuts
LLC Split Case Range Chart
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Additional product ranges & services• End suction
• Long coupled and close coupled
• Multistage pumps• Variety of materials• Horizontal or vertical
• Booster sets
• PaT ‐ pumps as turbines• For hydro power generation
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Types of impellers
Types of Impellers
Radial flow impeller
Axial flow impeller
Closed‐impellers are the most efficient type of radial flow impeller, as flow is directed through the channels between the impeller vanes.
They can be used on relative high flow with medium head requirements.
Used on low head large flow applications
Mixed flow impeller
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Centrifugal pump curves
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Pump and System Interaction
What are we looking to achieve with pump station design? to deliver the required volume of liquid using the minimum amount
of energy. pumps operating with greater reliably and in turn requiring less
maintenance and fewer call outs to pumping stations.
Why is this not always possible to achieve? Incorrect pump specification Errors in pumping station design Inadequate pump control
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Errors in Pump Station Design
How can we ensure we eradicate this aspect ? early engagement with pump suppliers. provide all the available information to allow a better understanding
of what the pump is being asked to perform – WIMES datasheets
What information do the pump suppliers need? all the required duty parameters utilisation full details on media being pumped system information
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• What does the system information comprise of?• Relates flow to head• Comprises static and friction losses• Takes account of any varying static• Incorporates common main losses, including process
equipment• Generally excludes station losses associated with individual
pump suction and delivery pipework – losses subtracted from pump curve
• Pump curve can be added
• How does this relate to the selection of the pump?The system curve
System Information
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Factors affecting friction loss
• Flow velocity• Pipe diameter• Number of pipes – parallel mains• Pipe material• Pipe age• Type of fitting• Liquid viscosity• Velocity/diameter and pipe materials have a major effect on
pump selection and power requirements
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• We advise that variable speed control be used when you have one or more of the following conditions:
• wide range of system head• variable flow required• run out problems at solo operation in parallel pump systems• uncertainty over system head• need to optimise running costs• suitable pump running at synchronous speed not available
Inadequate pump control
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Incorrect Pump Selection
Why do we see poor pump selection Not selected to operate
at or near to BEP over the entire operating range required
Not the best pump type for the application
Insufficient system information to make the best choice of pump
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Original BEP
Hydraulic Deterioration
Head/Flow
Efficiency
Deteriorated
Deteriorated
Flow Reduces =More Hours Run
Efficiency Loss = More Power
SPP
Wat
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ump
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Thank You
