MINIMIZE YOUR FOOTPRINT AND YOUR MAINTENANCE HEADACHES ... · PDF fileminimize your footprint...
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MINIMIZE YOUR FOOTPRINT AND YOUR MAINTENANCE HEADACHES
SELF CLEANING TRENCH TYPEWET WELL DESIGNS
T W S ith P ETrooper W. Smith, P.E.Mukesh R. Pratap, P.E.Freese and Nichols, Inc.
1701 North Market Street, Suite 500 LB51Dallas TX 75202
AGENDA
1 Presentation Objectives1. Presentation Objectives
2. Project Background
3. Pump Station Evaluation
4. Trench Type Wet Well
5 C t ti U d t5. Construction Updates
6. Acknowledgements / Questionsg Q
PRESENTATION OBJECTIVES
Introduction to Trench Type Wet Wellsyp
Introduction to Self Cleaning OperationIntroduction to Self Cleaning Operation
Why Factor ?
TOPIC
1 Presentation Objectives1. Presentation Objectives
2. Project Background
3. Pump Station Evaluation
4. Trench Type Wet Well
5 C t ti U d t5. Construction Updates
6. Acknowledgements / Questionsg Q
PROJECT SCOPE
Trinity River Authority
Trinity River AuthorityCRWS Treatment Plant
Design and Construction of Pump Station 13B
Fl id f I t t R t A ti t d Sl dFluid of Interest: Return Activated SludgeFinal Clarifiers – Traveling Bridge Suction Clarifiers
Firm Capacity - 50MGDPS-13 – 50 MGD (North Plant, Trains 1-3)PS 13B 50 MGD (North Plant Trains 4 6)PS-13B – 50 MGD (North Plant, Trains 4-6)PS-13A – 100MGD (South Plant, Trains 7-12)
13
13B13B
13A
HISTORY OF THE PROJECT
YEAR 2005 YEAR 2007YEAR 2007
YEAR 2006YEAR 2007
to 2009
FEASIBILITY REPORT
PRELIMINARY DESIGN FINAL
DESIGNCONSTRUCTION
PHASEREPORT REPORT DESIGN PHASE
TOPIC
1 Presentation Objectives1. Presentation Objectives
2. Project Background
3. Pump Station Evaluation
4. Trench Type Wet Well
5 C t ti U d t5. Construction Updates
6. Acknowledgements / Questionsg Q
PUMP STATION EVALUATION
Dry Pit/Wet PitDry-Pit/Wet-PitHorizontal Non-Clog Centrifugal Pumps (PS 13 and PS 13A)(PS-13 and PS-13A)
Vertical Non-Clog Centrifugal Pumps (PS 6 d 6A)(PS-6 and 6A)
Wet PitWet-PitVertical Turbine Solids Handling Pumps (VTSH)
Pump Station 13A – Horizontal Non-Clog Centrifugal Pumps (Wet Pit/Dry Pit)
Pump Station 6 – Vertical Non-Clog Centrifugal Pumps (Wet Pit/Dry Pit)
Pump Station 6A – Vertical Non-Clog Centrifugal Pumps (Wet Pit/Dry Pit)
Pump Station 13A Horizontal Non-Clog Centrifugal Pump(PS-13A)
Vertical Non-Clog Centrifugal Pumps(PS-6 and 6A)
VTSH PUMPS
VTSH PUMPS
City of Phoenix, 23rd Ave. WWTP(36-inch VTSH Pumps)
LIMITATIONS AT PS-13B SITE
60-inch Final Clarifier Effluent line
84-inch Primary Clarifier Effluent line
Electrical Duct Bank
Caustic Soda Tank
2-inch to 12-inch Lines
12-foot Roadway
Existing Structures and Utilities
DRY PIT VERSUS WET PITR l t d 60 i h FCE Li
Relocated PavementRelocated 60-inch FCE Line
Footprint of Dry-Pit/Wet-Pit(Horizontal Non-Clog Pumps)
Relocated Caustic Soda Building
( o o No C og u ps)
Relocated 84-inch PCE Line
Footprint of Wet-Pit Wetwell(VTSH Pumps)
Existing Caustic Soda Storage Facility, 84-inch PCE Line, 60-inch FCE Line and Pavement Remains Unchanged
DRY PIT VERSUS WET PIT
Pump Station Type
Length/Width Depth Pump Cost ($)*
OPCC ($)**
Horizontal Non-Clog Centrifugal Pump
67’/65’ 26’ $915,000 $10.9 millionCentrifugal Pump Station (Wet Pit/Dry Pit)
Vertical Non-Clog Centrifugal Pump Station (Wet Pit/Dry Pit)
59’/54’ ~ 35’ $945,000 $11.4 million
Station (Wet Pit/Dry Pit)
VTSH Pump Station (Wet Pit)
49’/43’ 29’ $1,718,000 $9.5 million
* Total Pump Cost for 3 Pumps* Total Pump Cost for 3 Pumps** OPCC: Opinion of Probable Construction Cost
TOPIC
1 Presentation Objectives1. Presentation Objectives
2. Project Background
3. Pump Station Evaluation
4. Trench Type Wet Well
5 C t ti U d t5. Construction Updates
6. Acknowledgements / Questionsg Q
TRENCH TYPE WETWELL
i bl f iSuitable for Design Flows > 3 MGD
Pump Intakes, Confined in a Deep, Narrow Trench
Pump Intakes, Substantially Lower Than Upstream Inlet Pipe
Suitable for Different Pump Types/Arrangementsyp g
TRENCH TYPE WET WELL
AdvantagesHydraulic Environment for Pump IntakesMinimum Footprint SizeSmall Floor Area (Minimum accumulation of sludge or grit)
Ease and Quickness of Cleaning
DisadvantagesC t Mi i l St C itCompact, Minimal Storage CapacityIncreased DepthClogging if Pumps Not UsedClogging if Pumps Not Used
TRENCH TYPE WETWELL
Invented by D.H. Caldwell (1964)
1998 Breakthrough1998 Breakthrough2nd Edition of Pumping Station DesignANSI/HI 9.8 Pump Intake Designp g
TRENCH TYPE WETWELL
Illustrative View of Kirkland Pump Station (Washington)
IMPROVED TRENCH DESIGN
Dr. Robert Sanks, Ph.D., P.E.
1:1 scale model of portion of a trench floortrench floor
Result: >5fps requirement
1 3 3 l d l f th1:3.3 scale model of the Kirkland Pump Station
Result: Only a small portion of the sand was ejected at pump down until equilibrium
ANSI/HI 9.8 Pump Intake Design (1998)
ANSI/HI 9.8 Pump Intake Design (To Be Released)
WET PIT VERSUS TRENCH TYPE
Pump Station Type
Length/Width Depth(Feet)
Pump Cost ($)*
OPCC ($)**
Wet Pit Pump Station 49’/43’ 30’ $1,718,000 $9.5 MillionWet Pit Pump Station 49 /43 30 $1,718,000 $9.5 Million
Trench Type Wet WellPump Station
57’/18’ 38’ $1,718,000 $8.5 Million
* Total Pump Cost for 3 Pumps** OPCC: Opinion of Probable Construction Cost
Site Plan – RAS Pump Station 13B
W t ll T h Fl S littWetwell Trench Flow Splitter
Wet Well Plan Elevation at 415.00’
SECTION VIEWS
SlopingWalls
Water Guide
W s
FilletFlow
Splitter Trench
SECTION VIEWS
4 fps (wet pit)3 fps (dry pit)
1 fps maxabove 3 fps (dry pit)trench
Illustrative Section of Pump Station 13B – Normal Operation
SELF CLEANING CYCLE
CleaningRamp 30-60%
Flow
TrenchComponents
Trench
PumppDown
HydraulicJumpp
Mixes sludge and scum into a massthat is ejected by the last pump
Cleaning Rampg p
Illustrative Section of Pump Station 13B – Cleaning Cycle (Pump Down)
Cleaning Rampg p
Illustrative Section of Pump Station 13B – Cleaning Cycle (Pump Down)
Cleaning Rampg p
Illustrative Section of Pump Station 13B – Cleaning Cycle (Pump Down)
Cleaning Rampg p
Illustrative Section of Pump Station 13B – Cleaning Cycle (Pump Down)
PUMP STATION 13B TESTING
Scenario 1
Scenario 2A
Scenario 2B
•1 clarifier •2-3 clarifiers •2-3 clarifiers
•16MGD
•Sluice gate for proper flow
•32-50MGD
•2 pumps at full speed let
•32-50MGD
•Sluice gate for proper flowfor proper flow
rate
•Use last pump
full speed, let turbulence do the cleaning
for proper flow rate
•Use last pump
TOPIC
1 Presentation Objectives1. Presentation Objectives
2. Project Background
3. Pump Station Evaluation
4. Trench Type Wet Well
5 C t ti U d t5. Construction Updates
6. Acknowledgements / Questionsg Q
CONSTRUCTION UPDATEOctober 1, 2007
CONSTRUCTION UPDATEOctober 19, 2007
CONSTRUCTION UPDATENovember 14, 2007
CONSTRUCTION UPDATEJanuary 18, 2008
CONSTRUCTION UPDATEFebruary 13, 2008
CONSTRUCTION UPDATEFebruary 28, 2008
CONSTRUCTION UPDATEMarch 12, 2008
CONSTRUCTION UPDATEMarch 20, 2008
TOPIC
1 Presentation Objectives1. Presentation Objectives
2. Project Background
3. Pump Station Evaluation
4. Trench Type Wet Well
5 C t ti U d t5. Construction Updates
6. Acknowledgements / Questionsg Q
ACKNOWLEDGEMENTS
Trinity River Authority of Texas
ANSI/HI (Hydraulic Institute) Pump Standards, 1998
Pumping Station Design, 3rd EditionEditor-in-Chief: Garr M. Jones, P.E.Co-Editors: Dr Robert L Sanks Ph D P ECo-Editors: Dr. Robert L. Sanks, Ph.D., P.E.
Dr. George Tchobanoglouos, Ph.D., P.E.Bayand E. Bosserman II, P.E.
Dr. Robert L. Sanks, Ph.D., P.E. (Quality Control)
Dr Joel E Cahoon Ph D P E Montana State UniversityDr. Joel E. Cahoon, Ph.D., P.E., Montana State University
QUESTIONSQ
Contact InformationTrooper Smith, [email protected], 214-217-2219
Mukesh Pratap, [email protected], 214-217-2208