I noticed in the April 8 addition of the Payson Roundup that the Gila County Board of Supervisors awarded a bid to an unknown contractor for $137,915 for refurbishing the main water storage tank in Pine.
I am wondering if this bid also includes cathodic protection for the interior of this tank. What is cathodic protection (CP)? Basically, electro-chemical corrosion control, by running DC voltage and amperage through a special metal called mixed-metal oxide on a titatanem strata with a copper conductor. The DC migrates through the water, penetrating the coating but stopping at the steel tank sides and turning to hydrogen. Hydrogen in this form is impervious to corrosion. There is another material used, Plantiumuized-Niobium on a copper conductor, costs more approximately $15 per foot, MMO $5 per foot.
Why do I bring this up? Coating a tank is good preventive maintenance, but there is no such thing as a perfect coating. This system is generally guaranteed if properly designed, installed and maintained (maintained means reading the rectifier once a month) for 20 years!
In the late ’70s, the U.S. Navy (they know something about water and rust) did some extensive tests on their own water tanks and found that proper coating with CP, double or tripled the life of the coating. They also have CP, on the hulls of every ship at sea. The American Water Works Association (AWWA) order D-104 also explains this process.
Plus you can call any city in the Valley, and the experts there will tell you the same. It also works extremely well on water treatment plants and underground steel water lines. I have installed this system on approximately 250 tanks from Arizona to Montana, so I know the system works.