Home - Tideflex Mixing Systems (TMS)  - Field Validation

Figure 1: Case Study
Residual Chlorine Concentrations

Field Validation

    Many utilities have validated the effectiveness of the TMS by conducted spatial sampling inside of tanks. In order to verify the effectiveness of mixing systems, samples need to be taken at various locations within the water volume, not just at the inlet/outlet pipe outside the tank. The following are just a few case studies:

    Figure 1 shows before and after residual data in a 1MG reservoir in Oregon. The residuals were low and inconsistent before the installation of the TMS. After installation, the residuals were 2-3 times higher and are consistent at the two sampling locations.

Figure 2: Case Study
0.5 MG and 1.5 MG Standpipes

    Figure 2 and Figure 3 show temperature data for two adjacent standpipes in Washington state. One standpipe is 0.5MG, the other 1.5MG. Both have a 120’ water depth. No modifications were made to the common inlet/outlet pipe in the 0.5MG tank. The TMS was installed in the 1.5MG tank. The utility installed temperature data loggers every 20’ thru the water depth in both tanks and collected data every 30 minutes for over 1 year. The left graph is data in July; the right is data in August. Water depth is on the x-axis and temperature on the y-axis. The 0.5MG tank without the TMS showed significant stratification in July and August. Notice, the severity of the thermocline increased in August due to consecuttive fill and draw cycles of incomplete mixing. The 1.5MG tank with the TMS was completely mixed in both months and stratification was completely eliminated.

Figure 4: Case Study
Chlorine Residual Comparison

    Figure 4 shows a Texas water utility’s chlorine residual data comparing two of their Composite Elevated Tanks (CET). The 1.5MG CET does not have a mixing system. The 2MG CET has a TMS installed. The utility has sample taps inside the bowl that are connected to continuous chlorine analyzers. The data shown is for the month of August. As water levels lower during a draw cycle, water from the mid and upper parts of the water volume get drawn into the system. The 1.5MG tank data shows drastic variations in residual due to the older unmixed water with lower residuals being drawn into the system. The 2MG tank with the TMS eliminated the stratification and eliminated the localized increase in water age that led to the drop in residuals of the 1.5MG tank.

US Patent No. 7,104,279
Canada Patent No. 2,409,009