4 Signs Your Standpipe is Stratified

Posted by Lily Kaiserman on 9/24/15 4:00 PM

A standpipe is a ground-supported storage tank with a height that is greater than its diameter. Its design helps generate storage and pressure with a low upfront cost compared to elevated tank geometries. While there are cost advantages to standpipes, its geometry is a liability: tall and skinny tanks naturally promote thermal stratification and harm water quality. Standpipes have a higher surface area to volume ratio – meaning that more surface area is exposed to heat from the sun, and there’s less volume inside the tank to absorb that heat. Additionally, the limited cross-sectional area of a standpipe makes it difficult to exchange heat between the hot water at the top of the tank and cold water at the bottom, resulting in thermal stratification. Below we have compiled four signs that indicate your standpipe is thermally stratified.

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Topics: active mixing, eliminate stratification, drinking water quality, PAX Water Mixer, storage tanks, water circulation, passive mixing, mixing systems, low turnover

5 Factors Putting Your Tank at Risk for Ice Formation

Posted by Lily Kaiserman on 9/11/15 8:00 AM

Every winter, water utilities across the United States and Canada deal with the challenges of cold weather, including main breaks and equipment outages. While these emergencies come without warning, they are obvious and visible when they do occur. But in other parts of the water distribution system, cold weather can create risk that is hidden from view: ice formation inside water storage tanks.

Often, the only time operators realize they have a problem with ice in their tanks is when it’s too late: after a tank’s interior is damaged or when the tank wall is punctured. Few operators climb and inspect their tanks in winter, so the extent of ice formation inside of water storage tanks is often unknown. Below we have compiled five factors that indicate your tank is at risk for ice formation.

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Topics: active mixing, active mixing for water storage tanks, ice prevention in storage tanks

4 Tips for Selecting In-Tank Aeration Systems

Posted by Susan Brenner on 8/31/15 4:43 PM

In-tank aeration is a proven method for removing trihalomethanes (THMs) from finished drinking water storage tanks. However, aeration technologies can vary greatly in their effectiveness and energy usage and selecting in-tank systems can be complicated. Several factors must be taken into consideration when selecting a system and each system should be customized to the tank to maximize THM removal while minimizing energy cost. Below, we have answered four questions received during our last webinar on in-tank aeration to help explain how in-tank aeration systems are designed.

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Topics: active mixing, active mixing for water storage tanks, drinking water quality, in-tank aeration, PAX Water Mixer

Improve Summer Chlorine Levels without Blowing DBPs

Posted by Lily Kaiserman on 8/18/15 1:36 PM

When summer temperatures rise, chlorine demand inside storage tanks increases and water quality can degrade. Warm water temperatures, particularly at the top of the tank, increase biological growth, deplete residual disinfectant and increase the formation rate of disinfection by-products (DBPs). Thermal stratification also creates hot and humid conditions inside the headspace, greatly accelerating corrosion rates inside steel tanks. One effective solution to combat stratification and maintain disinfectant residual levels is active mixing. A powerful mixer eliminates thermal and chemical stratification inside tanks and reduces the growth of biofilms and DBPs. Below, we answered three common questions on maintaining residual disinfectant levels inside water storage tanks.

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Topics: active mixing, eliminate stratification, drinking water quality, PAX Water Mixer, storage tanks, water circulation, passive mixing, mixing systems, low turnover

Five Mixing MythBusters

Posted by Lily Kaiserman on 5/7/12 12:46 PM

Charles Fishman (author of The Big Thirst) wrote a piece for the Washington Post last month on “Five Myths About Water.” Number two on Charles’ myth list is “bottled water is better than tap water,” where he unveils that tap water is actually MORE closely monitored than bottled water and that in blind taste tests “people can’t reliably pick bottled from tap.” At PAX Water, Charles’ article got us thinking about some of the myths we’re trying to bust in the drinking water industry. Here are our top five:

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Topics: active mixing, eliminate stratification, drinking water quality, PAX Water Mixer, storage tanks, water circulation, passive mixing, mixing systems, low turnover

Nitrification Risk Can Be Reduced by Active Mixing

Posted by Peter Fiske on 11/16/10 12:19 PM

The AWWA Distribution System Water Quality Committee is embarking on revisions to their M56: Fundamentals and Control of Nitrification in Chloraminated Drinking Water Distribution Systems.  The M56 manual is a complete guide to managing nitrification and is intended to be a principal technical resource for water system operators throughout the US.

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Topics: biofilms, active mixing, eliminate nitrification, nitrification

Top Mixing Questions from the ASDWA Conference in Pittsburgh

Posted by Karen Losee on 10/26/10 4:35 PM

PAX Water Technologies presented a technical talk at the 25th annual Association of State Drinking Water Administrators meeting last week in Pittsburgh, PA entitled Stabilization and Improvement of Distribution System Water Quality in Reservoirs and Tanks – a Key to Stage 2 Compliance.

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Topics: dbp formation, high water age, disinfectant residual, active mixing

Top Mixer Questions from AWWA's Storage Tank Water Quality Webinar

Posted by Peter Fiske on 10/14/10 8:13 PM

The AWWA held a webinar on October 6, 2010 entitled Sustainable Water Quality Management within the Storage Tank: Part 2 (you can listen to a rebroadcast here).

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Topics: storage tanks, WaterMix, mixing systems, biofilms, active mixing

Active Mixing CAN Reduce Water Age!

Posted by Peter Fiske on 9/28/10 4:34 PM

We learned this week that an engineer (who shall remain unnamed) presented a paper at the DSS meeting in Maryland about water age modeling in which he claimed that mixing CANNOT decrease water age. 

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Topics: storage tanks, mixing systems, high water age, disinfectant residual, active mixing

Beating the Heat with Active Mixers

Posted by Peter Fiske on 7/6/10 8:29 PM

Temperatures are expected to top 100 degrees across much of the Eastern seaboard this week and municipalities large and small will be contending with managing their water quality. 

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Topics: eliminate stratification, water circulation, high water age, active mixing

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