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This section contains Case Histories of results from RTA Water Treatment experience.
- The mild steel corrosion rates were very high at 7.0 in a cooling tower system. Upon starting to treat a new account cooling tower, the initial coupon evaluation results were high, so adjustments were made in the chemical program. But rather than waiting for 3 months or more for lab evaluation, we visually checked the mild steel coupon weekly for several weeks, adjusting various parameters as we went, until the corrosion rates appeared to have been materially reduced. After successful successive observations, corrosion coupons were again sent in for analysis. This procedure resulted in the development and use of the RTA 9580 corrosion product. Over the years these corrosion rates typically are reported at 0.5 Mills per year consistently, or less, which low rate is totally beyond normal expectations.
- Air not properly bled from closed system upon refilling. When air is not properly bled from a closed system, when newly repiped or when re-filled, corrosion products may form from the attack of the air on the system piping. The left bottle shows a sample of a system after a few months of running without proper bleed off of air. The water was tested at 13.5 ppm of total iron during the non-treatment period. The right bottle is clear tap water for reference. The system was properly treated before construction modifications. Construction took about three months during which time the system was either empty or partially empty.
- An 800 ton chiller was chemically cleaned on line and began running approach temperatures around 0.40 after cleaning. Before the light chemical cleaning took place, and after the condenser head was removed and tubes were brushed, the approach temperature ran about 1.5 to 1.9 The service company was surprised, thinking that 1.5 after brushing tubes was good. See picture of chiller control to right.
No treatment was run into a cooling tower for many months, or more when RTA Water Treatment started with the account. Top tower pans had calcium carbonate scale of 1/4″ or more and was totally covered with the scale.
Nozzles were partially plugged (see picture below of top tower pan) and flow was