Water & Industry Business Unit Presented By: Stuart Wallis - - PowerPoint PPT Presentation

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Water & Industry Business Unit

Presented By: Stuart Wallis Stuart_Wallis@spppumps.com Mobile 07720 498 333

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• 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

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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 ‐ Present SPP 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 horizontal

Except 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
• f 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
• f 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 Water Division – Waste Water Pump

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Thank You