Red Valve Company

DISTRIBUTION SYSTEM TANK MONITORING AND WATER QUALITY

RATIONALE

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• 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

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Distribution water quality issues!

• Distribution piping?

• Backflow?

• Water age?

• Tank design and operations?

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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

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Increased monitoring• Grab samples• In-tank monitoring• Continuous

monitoring• Tank operational

data

INCREASED MONITORING

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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

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Inlet / outlet grab samples

INCREASED MONITORING

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Inlet / outlet grab samples

INCREASED MONITORING

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Safety• Climbing gear• PPE• Training

INCREASED MONITORING

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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

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INCREASED MONITORING

• Colder Water is Negatively Buoyant

• Influent Will Sink To Bottom

• Influent Will Not Mix Regardless of Length of Fill Cycle

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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

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In-tank temperature monitoring

• Very little temperature separation

• Temperatures converge during fill cycles showing good mixing

INCREASED MONITORING

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In-tank temperature monitoring

INCREASED MONITORING

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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

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In-tank grab samples• In-tank sample taps

In-tank sample taps & sink

In-Tank Sample Tap Enclosure

In-Tank Sample Lines

INCREASED MONITORING

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In-tank grab samples• Sample from the hatch

Kemmerer sampler

Purge Pump

INCREASED MONITORING

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In-tank grab samples• 2.0 MG• Groundlevel reservoir• Concrete• Vertical common inlet /

outlet

INCREASED MONITORING

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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

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Continuous monitoring - daily

• 0.50 MG• Hydropillar• Common inlet /

outlet

Turnover time:

6 Days

INCREASED MONITORING

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Continuous monitoring - seasonal

• 2.2 MG• Welded steel• Ground

storage tank• Common inlet

/ outlet

Turnover

time:

20 Days

INCREASED MONITORING

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Tank operational data• Tank levels• Compare tank level to water

quality data• Determine tank turnover Tank Level Display

OPERATIONAL DATA

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Tank operational data

OPERATIONAL DATA

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Tank operational data

OPERATIONAL DATA

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Tank operational data

• 0.50 MG• Standpipe• Bolted steel• Vertical common

inlet / outlet• Located at dead-end

Turnover time:

18 days

OPERATIONAL DATA

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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

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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!