Modular Rectifier System for Commercial and Residential Properties
Cathodic protection is a proven method for preventing soil-related corrosion problems of buried metallic pipelines. If you have experienced plumbing leaks, cathodic protection can significantly reduce or eliminate the leak frequency.
Below-slab plumbing leaks (slab leaks) caused by soil-related corrosion affect many residential properties. They are expensive to repair, disruptive, cause moisture damage, and are a major cause of mold related repair work.
Low Cost & No Disruption
As a preventive measure, or if you have already exprienced slableaks, Cathodic Protection can significantly reduce or eliminate further leak problems. With our system there is no disruption to residents because it is installed outside the dwelling space, see Figure 1 below.
Add Value to Your Property
Backed by over twenty years of experience, our systems have added value to residential properties as a proven proactive maintenance effort. With the rising cost and exposure of leak-related damages property owners and managers are recognizing the economic sense of preventing rather then reacting to the slab leak problem.
Compatible with Other Options
Are you considering water treatment inhibitors, repiping, or epoxy coatings? You can protect your existing piping now with our system and keep your options open. If you are considering water treatment inhibitors or epoxy coatings to protect the water-side surfaces of the piping, cathodic protection will complement these methods by protecting the soil-side of the buried piping from ongoing corrosion.
Cathodic Protection is so effective at preventing leaks that the Federal Government has required it by law for all buried gas and oil pipelines. Why shouldn't it be used for below-slab water piping? Talk to your insurance company about a potential discount on your building's policy.
Cathodic Protection is the practical choice for addressing existing slab leak problems
|How it Works - Common Examples
Cathodic protection is a basic reversal of the corrosion process. When applied to below-slab piping the corrosion tendencies are transferred from the piping to a “sacrificial” metal that is consumed instead. See Typical Installation Figure 1.
The sacrificial anode in all hot water heaters is just one example of the everyday use of cathodic protection, see Figure 2. As long as the anode is intact, the steel hot water tank does not corrode. The only difference between a hot water heater with a 5-year warranty and a 10-year warranty is the weight of the anode. In a similar manner the CP-350 and CP-2000 have been designed to protect the soil-side of below-slab copper piping from ongoing corrosion for at least ten years.
For buildings with prior leak histories, cathodic protection results in a dramatic decrease in leak frequency. Actual case histories have shown the leak frequency of soil-related corrosion problems rapidly approaching zero, see Figure 3. As a preventive measure cathodic protection can save owners from the major headaches caused by future ongoing leak problems.
Cathodic Protection - A Scientific Descripition
Cathodic protection works on a principle discovered by Michael Faraday. Faraday discovered that when an electrical current is passed between two electrodes in an electrolyte (soil or liquid) chemical reactions must occur at the surface of each of the electrodes. A reduction reaction must occur at the negative electrode (referred to as the cathode) and an oxidation reaction (corrosion) must occur at the positive electrode (referred to as the anode).
Cathodic protection is a process in which the structure (pipe) to be protected is made the cathode in an electrical circuit and a "slave" ground bed is made the anode in the circuit. Since the pipe is made the cathode in the circuit, only a harmless reduction reaction can occur on its surface. The cathodic protection process creates a condition where only a harmless reduction reaction can occur on the pipeline and no oxidation (corrosion) reaction can occur.
The "slave" ground bed is designed to withstand the corrosive oxidizing current for a finite period of time. Typical design life for a ground bed is at least 10 years.
ARCHITECT'S SPECIFICATIONS -
Cathodic Protection System: Modular rectifier system, Model CP-350 or CP-2000, as manufactured by Leak Control Systems, Inc. A cathodic protection system designed for use on commercial and residential properties to address external corrosion of piping buried below the concrete slab. Rectifier(s) shall be installed in utility room, electric meter room, tank heater room, or other location, as specified by engineer. Number of modular rectifiers, location, and quantity of anodes for each rectifier system shall be determined by engineer. System shall be designed to have a minimum life expectancy of ten years.
The term "modular rectifier system" refers to a Model CP-350 or CP-2000 rectifier and its associated ground bed. The term "engineer" refers to a registered Professional Engineer or a Corrosion Technologist as defined by the NACE Professional Recognition Program.