Red Valve Company
DISTRIBUTION SYSTEM TANK MONITORING AND WATER QUALITY
RATIONALE
2
• Tanks play a key role in distribution system operations
• Tanks have many challenges, including degraded water quality
• Properly assessing tanks is key to developing a corrective action plan
• Increased tank monitoring Inlet / outlet grab samples In-tank temperature monitoring In-tank grab samplesContinuous monitoring
• Operational data• Data-based decisions
Red Valve Company
OUTLINE
DISTRIBUTION WATER QUALITY
4
Distribution water quality issues!
• Distribution piping?
• Backflow?
• Water age?
• Tank design and operations?
5
How are my tanks impacting my water quality? • Is compliance water
quality data enough?• How do I determine the
cause of water quality issues?
DISTRIBUTION WATER QUALITY
6
Increased monitoring• Grab samples• In-tank monitoring• Continuous
monitoring• Tank operational
data
INCREASED MONITORING
7
Inlet / outlet grab samples• Sample at END of fill cycle
• Sample at END of draw cycle
• Note tank phase• Incorporate Worst Case Scenario
Inlet / Outlet Sample Tap
INCREASED MONITORING
Best water
Worst water
8
Inlet / outlet grab samples
INCREASED MONITORING
9
Inlet / outlet grab samples
INCREASED MONITORING
10
Safety• Climbing gear• PPE• Training
INCREASED MONITORING
11
In-tank temperature monitoring• Temperature probe• Temperature dataloggers• During inspection• Determine if thermal
stratification is occurring within the tank
• Note tank phase
Temp probe
ROV
Temp datalogger string
INCREASED MONITORING
12
INCREASED MONITORING
• Colder Water is Negatively Buoyant
• Influent Will Sink To Bottom
• Influent Will Not Mix Regardless of Length of Fill Cycle
13
In-tank temperature monitoring
• In tank (thermal) stratification
• Greater than 2oFahrenheit is significant
• Temperatures do not converge during fill cycle showing poor mixing
INCREASED MONITORING
14
In-tank temperature monitoring
• Very little temperature separation
• Temperatures converge during fill cycles showing good mixing
INCREASED MONITORING
15
In-tank temperature monitoring
INCREASED MONITORING
16
In-tank grab samples• Sample water quality at various
depths throughout the tank• Data to indicate whether
stratification or tank operations are impacting in-tank water quality
• Note tank phase• Incorporate Worst Case Scenario
INCREASED MONITORING
17
In-tank grab samples• In-tank sample taps
In-tank sample taps & sink
In-Tank Sample Tap Enclosure
In-Tank Sample Lines
INCREASED MONITORING
18
In-tank grab samples• Sample from the hatch
Kemmerer sampler
Purge Pump
INCREASED MONITORING
19
In-tank grab samples• 2.0 MG• Groundlevel reservoir• Concrete• Vertical common inlet /
outlet
INCREASED MONITORING
20
Continuous monitoring• Provide a clearer
picture of water quality over time and under various conditions
• Daily and seasonal variations
THM Analyzer
Multi-Probe Monitor
INCREASED MONITORING
21
Continuous monitoring - daily
• 0.50 MG• Hydropillar• Common inlet /
outlet
Turnover time:
6 Days
INCREASED MONITORING
22
Continuous monitoring - seasonal
• 2.2 MG• Welded steel• Ground
storage tank• Common inlet
/ outlet
Turnover
time:
20 Days
INCREASED MONITORING
23
Tank operational data• Tank levels• Compare tank level to water
quality data• Determine tank turnover Tank Level Display
OPERATIONAL DATA
24
Tank operational data
OPERATIONAL DATA
25
Tank operational data
OPERATIONAL DATA
26
Tank operational data
• 0.50 MG• Standpipe• Bolted steel• Vertical common
inlet / outlet• Located at dead-end
Turnover time:
18 days
OPERATIONAL DATA
27
Data-based decisions• Important to have the
correct data to make decisions
• Good data = good decisions
• Validate changes or improvements
DATA-BASED DECISIONS
• Tanks can have a major impact on distribution system water quality
• Collecting the proper data is key to evaluating tank performance
• Good data leads to good decisions• Data is critical to validate changes or
improvements
28
SUMMARY
Red Valve Company
Paul HandkeTMS Product Manager
600 North Bell Ave.
Carnegie, PA 15106
P: (412) 279-0044 x 255
C: (412) 780-6681
F: (412) 279-7878
www.redvalve.com
www.tideflex.com
THANK YOU!