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The design of a galvanic anode CP system should consider many factors, including the type of structure, the resistivity of the electrolyte (soil or water) it will operate in, the type of coating and the service life. The primary calculation is how much anode material will be required to protect the structure for the required time.
The storage tanks of water heaters are usually made out of steel with a lining of glass inside them. Water will corrode exposed steel, so the glass lining prevents or delays corrosion. The tanks also have magnesium anode rods. The anode rod will slow down corrosion of the steel tank by corroding in its place. [7]
Over time the galvanic anode continues to corrode, consuming the anode material until eventually it must be replaced. Galvanic or sacrificial anodes are made in various shapes and sizes using alloys of zinc, magnesium, and aluminum. ASTM International publishes standards on the composition and manufacturing of galvanic anodes. [10] [11] [12]
The terms anode and cathode are not defined by the voltage polarity of electrodes, but are usually defined by the direction of current through the electrode. An anode usually is the electrode of a device through which conventional current (positive charge) flows into the device from an external circuit, while a cathode usually is the electrode through which conventional current flows out of ...
Direct electric resistance tank water heaters are not included in the Energy Star program; however, the Energy Star program does include electric heat pump units with energy factors of 200% or higher. Tankless gas water heaters (as of 2015) must have an energy factor of 90% or higher for Energy Star qualification.
A California couple watched the Eaton Fire destroy their beloved home of 40 years “in the blink of an eye” through a doorbell camera as they fled with just a few cherished items and their dogs.
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