Hydraulic Optimization of the Northern Water Supply System

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Hydraulic Optimization of the Northern Water
Supply System
Presentation by Tom Charles, P.E., DEE Jim
Kriss, P.E. Jennifer Wendrowski,
E.I.T. September 2004
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ECCV H206 Water Supply Facility
WTP High Service PS

• Renewable Water Supply Source
• Alluvial Wells and Delivery Network
• Reverse Osmosis Treatment Plant
• 32 Mile Transmission Pipeline
• 2 Pump Stations
• Phase 2 Improvements (Future)

Booster PS
Smoky Hill Storage
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Alternative No. 1 Base Model
409 psi
10 MGD

• System Consists of
• RO WTP
• HSPS
• BPS-1 Tank
• Storage Tanks
• 32 miles of 24-inch pipe
• Problem high discharge pressure from HSPS

24 f
324 psi
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Alternative No.2 Inline Booster Model
143 psi
24 f
10 MGD
205 psi

• System Consists of
• RO WTP
• HSPS
• In-line BPS-2 Tank
• BPS-1 Tank
• Storage Tanks
• 7 miles of 24-inch pipe
• 25 miles of 30-inch pipe

13 MGD
30 f
274 psi
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Alternative No.3 Booster Injection Model
360 psi
24 f
10 MGD

• System Consists of
• RO WTP
• HSPS
• Injection BPS-2 Tank
• BPS-1 Tank
• Storage Tanks
• 7 miles of 24-inch pipe
• 25 miles of 30-inch pipe

213 psi
13 MGD
30 f
266 psi
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Alternative 1 - Pressure Trace for
Suction/Discharge (No Controls)
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Alternative 1 - HGL Envelope (No Controls)
Smoky Hill
BPS 1
HSPS
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Alternative 1 - Pressure Trace for
Suction/Discharge (With Controls)
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Alternative 1 - HGL Envelope (With Controls)
Smoky Hill
BPS 1
HSPS
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Alternative 2 - Pressure Trace for
Suction/Discharge (No Controls)
J-10
J-11
J-4
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Alternative 2 - HGL Envelope (No Controls)
Smoky Hill
BPS 1
BPS 2
HSPS
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Alternative 2 - Pressure Trace for
Suction/Discharge (With Controls)
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Alternative 2 - HGL Envelope (With Controls)
Smoky Hill
BPS 1
BPS 2
HSPS
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Pump Selection - VSD versus CSD

• Meet System Operating Requirements
• Match RO Membrane Skid Production
• Minimize Tank Fluctuations
• Minimize Pump Cycle Time
• Minimize Capital and Operating Costs
• Minimize Pump Room Footprint

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2 Duty VFD Pumps, 1 Standby
BPS Pump Head/System Curve 30 inch North
Pipeline Floway 18 MKH (5 stg, 1770 rpm, 11.875
trim), 2 VFDs
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5 Duty CSP Pumps, 1 Standby
BPS Pump Head/System Curve 30 inch North
Pipeline Floway 14 JKH (6 stg, 1770 rpm) 5 pumps
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Operating Cost Comparison

• VSP/ CSP Capital Costs Similar
• Justify VFD Capital Cost?
• Annual Billing Estimates
• Present Worth Analysis
• Pump Power Use for Flow Targets
• Monthly Demand Distribution
• System Operation
• Intermittent Winter Operation
• Max Capacity during Summer Peak

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Pump Power Requirements
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Operating Cost Comparison

• VSP/ CSP Capital Costs Similar
• Justify VFD Capital Cost?
• Annual Billing Estimates
• Present Worth Analysis
• Pump Power Use for Flow Targets
• Monthly Demand Distribution
• System Operation
• Intermittent Winter Operation
• Max Capacity during Summer Peak

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Variable Speed Billing Estimate
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Constant Speed Billing Estimate
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Questions Answers