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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