Transcript Pump Operational Flexibility & Optimization

Pump Operational Flexibility &
Optimization
Pat Carney
Flow-Technics Inc.
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Topics of Discussion
 Evaluations/Considerations
 Flexibility & Optimization Options
 Examples
 Conclusions
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Evaluations/Considerations
 Characteristics of System Head Curve
 Operational Considerations
 Pump Characteristics
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System Head Characteristics
 Components
 Static Head
 Frictional Head
 Velocity Head
 Characteristics


Flat
Steep
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System Head Curve
Flat Curve
Steep Curve
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Operational Considerations
 Electrical Cost/Efficiency
 Flow Rate Flexibility
 Controllability
 All of the above
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Pump Characteristics
 Shape of the Curve
 Efficiency
 NPSHr
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Pump Curve – Flat Curve
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Pump Curve - Steep
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Operational & Optimization Options
 Single Pump vs. Multi-Pump Consideration
 Constant Speed vs. Multi-Speed
 Combination of Both
 Single vs. Multi Pump
 Constant vs. Variable Speed
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Single Pump vs. Multi-Pump
Single Pump
Multi - Pump
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Single vs. Multi Pump Evaluation
 Single Pump
 Flow: 3500 GPM
 Head: 65’
 Eff: 68.8.%
 Rated Hp: 85.5
 NPSHr: 17.1’
 Connected Hp: 115
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Two Pumps
Flow: 3500 GPM total
Head: 65’
Eff: 81%
Rated Hp: 68.8(total)
NPSHr: 9.6’
Connected Hp: 94(total)
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Constant vs. Variable Speed
Constant Speed
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Variable Speed
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Constant vs. Variable Evaluation
 Constant Speed
 Flow: 2100 GPM
 Head: 45
 Eff: 80.8%
 Rated Hp: 29.3
Variable Speed
Flow: 2100 GPM
Head: 45
Eff: 64.2%
Rated Hp: 36.8
Max Daily: 17 hp for variable operation
Ave Day: 15 hp
Low Flow: 10 hp
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Constant vs. Variable (Example #1)
Constant vs. Variable (Example #2)
 Flat System Curve
 Steep Pump Curve
 Limited Operating Range
 VFD vs. Cost Evaluation
Optimization Review - Unacceptable
Spec Requirement
2250 GPM @ 65’ TDH
(2 Pumps Running)
Submittal Review
Single Pump Operation
Static Head 28’
Unacceptable
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Optimization Review - Acceptable
Spec Requirement:
2250 GPM @ 65’ TDH
(2 Pumps Running)
Static Head: 58’
Submittal Review:
Single Pump Operation
Static Head: 28’
Acceptable
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Theoretical vs. Actual
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Field Modifications
With use of VFD, reduce speed to match actual system
requirements.
Evaluate 2 Pumps at reduced speed vs. 1 pump running
Resize and replace Impeller
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2 Pumps Reduced Speed
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Conclusions
 Understand System Characteristics
 Design Criteria
 Operational Criteria
 Communication!!
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