2009 Red Valve Co. / Tideflex Technologies. All rights reserved.
The Science of Mixing Water Storage Tanks and
The Tideflex Mixing System (TMS)
Presented by:
Michael Duer, P.E., Chief Engineer, Red Valve Co.
1) Minimize Short-Circuiting and Stagnant Areas (SEPARATE INLET AND OUTLET PIPE) 2) Achieve Complete Mixing During Fill Cycle (MIXING TIME LESS THAN FILL TIME) 3) Achieve Adequate Turnover (FLUCTUATE LEVELS)
Tanks are DESIGNED to turnover Tanks NEED to turnover to minimize water age Built-in energy source inherent to distribution systems
How to Maintain Water Quality in Reservoirs
COMBINATION OF MIXING SYSTEM DESIGN AND
TURNOVER/FLUCTUATION OF THE TANK
DESIGN
OPERATIONS
A Single Inlet Pipe Often Cannot Mix a Tank in Summer with Colder Inlet Water
Properly Designed Multi-Port Manifold Can Completely
Mix in Summer
Georgia Tech
and Red Valve
OUTLETS
Original TMS Design Concept (I/O Pipe Separation)
INLETS
TIDEFLEX INLET NOZZLES
OLD 2-PIPE SYSTEM
TMS MANIFOLD PIPE WATERFLEX OUTLET
CHECK VALVES
Waterflex® Outlet Check Valve
Open
Closed
Waterflex® Outlet Check Valves mount to standard fittings, have low headloss, and
150 psi backpressure rating
Tideflex Series 37 Outlets Required Special Fittings to fit their Length, had higher
headloss, and limited backpressure rating
Greener than Green. Passive. Uses energy source inherent to distribution systems – differential pressure
All TMS Configurations are CFD and/or Scale Modeled and Field Validated for Every Tank Style
Achieves Separate Inlet and Outlet on a Single Manifold Pipe
Achieves Complete Mixing with Variable Orifice Tideflex Inlet Nozzles
No Maintenance - No Mechanical Parts
NSF61 Certified Valves
Elastomer Independently Tested for Chlorine and Chloramine Exposure – no degradation
Connected to Inlet/Outlet Pipe – No Additional Tank Penetrations Required
Easy Retrofit (dry or wet installation)
Complete System Design
At Least 30 year life
Tideflex Mixing System (TMS) Features
Optimized Jet Velocity of Tideflex Inlet Nozzles
Tideflex Inlet Nozzles Maximize Jet
Velocity at ALL Flow Rates
Compared to Fixed-Diameter Pipe
Fixed-Diameter pipes cannot
optimize jet velocity Tideflex Inlet Nozzles optimize jet
velocity at all flow rates
TMS for Circular Reservoirs
Town of Hillsborough, CA Sampling of (2) 0.5MG Reservoirs (60.5’ Dia. x 23’ SWD)
Quarterly Samples taken in 3 quadrants and 3 depths (low, mid, high)
HIGH
MID
LOW
Town of Hillsborough, CA Sampling of (2) 0.5MG Reservoirs (60.5’ Dia. x 23’ SWD)
TMS for Rectangular Reservoirs
TMS for Pedesphere, Hydropillar and Composite
Elevated Tanks
Tideflex Inlet Nozzles
Waterflex Outlet
Valves
Sampling 1.5MG and 2MG Elevated Tanks with and without TMS - McKinney, TX
2MG Composite
Elevated with TMS
2MG Composite
Elevated with TMS
1.5MG Composite
Elevated without TMS
(3) Dedicated sampling lines (low, mid, high) run to continuous chlorine
analyzer. Data for entire month of August 2007
TMS for Elevated Tank with Wet Riser
INLET
NOZZLES
OUTLETS
Wet Riser Typically 36”-96” Diameter
KNOCKS MOMENTUM OUT OF INFLOW!!
CFD- Wet Riser Inlet, Cold Water
CFD- Multiport Inlet, Isothermal
TMS for Standpipes TIDEFLEX INLET
NOZZLES
WATERFLEX
OUTLET VALVES
2008 Red Valve Company/Tideflex Technologies. All rights reserved
Clark Public Utilities, WA Temperature Profiling Adjacent Standpipes, 0.5 MG and 1.5MG (125’ Deep)
Without TMS
Temp. Data Loggers Installed Every 20’ Thru Depth. Logged Temp’s Every 30 minutes for
Over 1 Year
With TMS
Temperature vs. Depth Data
7/12/03
60
62
64
66
68
70
72
74
76
10 30 50 70 90
0.5 MG 1.5 MG
8/1/03
60
62
64
66
68
70
72
74
76
10 30 50 70 90
0.5 MG 1.5 MG
Without TMS
Without TMS
With TMS With TMS
Stratification Gets Worse in Smaller Tank from July to August
Stratification Eliminated in Larger Tank with Mixing System
ICING Case Study (Before TMS) Region of Peel 0.55MG Standpipe (30’ Dia. X 110.5’)
30’ Dia. x 10’ Deep Slug of Ice – In May!
Ice removal took 2 weeks and $27,000
ICING Case Study (After TMS Installed) Region of Peel 0.55MG Standpipe (30’ Dia. X 110.5’)
Active Tideflex Mixing System (ATMS)
IF active mixing is required: A Passive TMS can be turned into an Active TMS with a recirculation pump
– Passive TMS installed INSIDE of Tank (No mechanical components inside tank so tank access not required for inspection or maintenance)
– All Mechanical Components in Vault OUTSIDE of tank (easily accessed in vault/structure for inspection and maintenance)
Recirculation pump is low flow, low head, low energy Can perform continuous mixing Can perform forced-draw down to minimize water age Can perform chemical injection for rechlorination, forming chloramines, or performing breakpoint chlorination Can turn recirculation pump off when not needed and let passive TMS mix tank
Recirculation
Pipe
Recirculation
Pump
Tank Inlet
Pipe to
Passive TMS
Passive TMS
installed in tank Scientific facts about mixing water storage tanks
• Tanks and reservoirs need to turnover (fluctuate levels) to minimize water age.
2) There is already an energy source from the distribution pumps to get the tank filled back to
high water level.
3) Fixed-diameter inlet pipes are inefficient in mixing and often cause water quality problems.
The Passive TMS is proven to be 5-10 times more mixing efficient than other mixing systems.
The Passive TMS uses the inherent energy source of the distribution system to achieve
complete mixing and eliminate water quality problems. Red Valve conducts a mixing
analysis of every water storage tank to verify if complete mixing can be achieved with the
Passive TMS based on tank turnover. It is rare that active mixing is required.
Complete System Design and
Hydraulic Analysis
QUESTIONS ?
Mike Duer, P.E., Chief Engineer [email protected]
Red Valve Company, Inc.
412-279-0044 phone www.redvalve.com www.tideflex.com
