220.127.116.11 Corrosion Resistance
Cathodic Protection (CP)
CP is a method of corrosion protection that creates a corrosion cell where the structure (tanks and/or piping) is the cathode instead of the anode.
CP can be achieved using either a galvanic (sacrificial) anode or impressed current. These are discussed on the next page.
CP systems must be properly designed and certified by a professional engineer in accordance to a nationally recognized industry standard (e.g. STI – P3).
Tanks and/or piping must also have a protective coating that isolates the outside surfaces from the electrolyte (moist soils).
All coatings on steel tanks must be inspected and tested for “holidays” (coating defects – pinholes, etc.) prior to installation for new UST system.