pump operational flexibility & optimization
DESCRIPTION
Pump Operational Flexibility & Optimization. Pat Carney Flow-Technics Inc. Topics of Discussion. Evaluations/Considerations Flexibility & Optimization Options Examples Conclusions. Evaluations/Considerations. Characteristics of System Head Curve Operational Considerations - PowerPoint PPT PresentationTRANSCRIPT
Pump Operational Flexibility & Optimization
Pat CarneyFlow-Technics Inc.
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Topics of DiscussionEvaluations/Considerations
Flexibility & Optimization Options
Examples
Conclusions
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Evaluations/ConsiderationsCharacteristics of System Head Curve
Operational Considerations
Pump Characteristics
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System Head CharacteristicsComponents
Static HeadFrictional HeadVelocity Head
Characteristics Flat Steep
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System Head CurveFlat 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 PumpConstant vs. Variable Speed
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Single Pump vs. Multi-PumpSingle Pump Multi - Pump
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Single vs. Multi Pump Evaluation
Single Pump Two PumpsFlow: 3500 GPM Flow: 3500 GPM
totalHead: 65’ Head: 65’Eff: 68.8.% Eff: 81%Rated Hp: 85.5 Rated Hp:
68.8(total)NPSHr: 17.1’ NPSHr: 9.6’Connected Hp: 115 Connected Hp:
94(total)Flow-Technics Inc 12
Constant vs. Variable SpeedConstant Speed Variable Speed
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Constant vs. Variable Evaluation
Constant Speed Variable SpeedFlow: 2100 GPM Flow: 2100 GPMHead: 45 Head: 45Eff: 80.8% Eff: 64.2%Rated Hp: 29.3 Rated Hp: 36.8
Max Daily: 17 hp for variable operationAve Day: 15 hpLow 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 Requirement2250 GPM @ 65’ TDH(2 Pumps Running)
Submittal ReviewSingle Pump
OperationStatic 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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ConclusionsUnderstand System Characteristics
Design Criteria
Operational Criteria
Communication!!
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