THE IMPORTANCE OF OPTIMISING SUMP DESIGN FOR THE RELIABLE OPERATION - - PowerPoint PPT Presentation

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THE IMPORTANCE OF OPTIMISING SUMP DESIGN FOR THE RELIABLE OPERATION - - PowerPoint PPT Presentation

Oct 20, 2022 464 likes •607 views

THE IMPORTANCE OF OPTIMISING SUMP DESIGN FOR THE RELIABLE OPERATION OF ROTODYNAMIC PUMPS Steve Graham Sales Director Richard Brewis Project Engineer ENSURING RESILIENCE IN A PUMPING STATION A pumping station is Expensive to build

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THE IMPORTANCE OF OPTIMISING SUMP DESIGN FOR THE RELIABLE OPERATION OF ROTODYNAMIC PUMPS

Richard Brewis – Project Engineer Steve Graham – Sales Director

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ENSURING RESILIENCE IN A PUMPING STATION

A pumping station is  Expensive to build  Expensive to run, and  Even more expensive when it stops running

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WHAT ARE THE NEEDS OF A PUMP?

Pumps need smooth and uniform liquids

  • Adequate suction pressure (NPSH)
  • Air entrainment
  • Pump pre-swirl
  • Uneven velocity profile
  • Surface and submerged vortices
  • Unstable flows
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HOW DO WE ENSURE WE MEET THESE REQUIREMENTS?

There are a lot of guides to sump design Experience shows us that these alone are insufficient to guarantee complete success The best solution is the modelling process, which:

  • Not only identifies potential problems
  • But also develops solutions before

construction begins

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THE FIRST CRITERIA FOR CONSIDERATION

 NPSH  Geometry  NPSH margin  3% head drop

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CAUSE AND EFFECT

 Insufficient NPSH  Cavitation  3% head drop  Indication of cavitation  Impact of cavitation

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OBSERVATIONAL ANALYSIS

 Pump pre-swirl  Dramatic impacts and effects  Direction of rotation  Loss of efficacy  Driver overload  Catastrophic failure

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EFFECT OF SPECIFIC SPEED

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UNIFORMITY OF DISTRIBUTION

 Velocity distribution  Effects of hydraulic imbalance  Reduced output  Vibration increase  Damage and failure

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ASSESSING AIR ENTRAINMENT

 Velocity distribution  Effects of hydraulic imbalance  Reduced output  Vibration increase  Damage and failure

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VORTEX TRACING

 Surface and submerged vortices  Key considerations  Pre-swirl  Air entrainment  Impeller imbalance

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MEASURABLE BENEFITS

 Reducing risk  It costs more to correct than prevent  Impacts longevity and consistency of performance  Marginal issues are low on visibility and can be high on cost  Early involvement makes all the difference  Collaboration is key

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THE IMPORTANCE OF OPTIMISING SUMP DESIGN FOR THE RELIABLE OPERATION OF ROTODYNAMIC PUMPS

Richard Brewis – Project Engineer Steve Graham – Sales Director

ANY QUESTIONS?