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| Home >> Services >> Cathodic Protection System Design |
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Cathodic protection is the most widely applied electrochemical corrosion control technique. This is accomplished by applying a direct current to the structure which causes the structure potential to change from the natural corrosion potential (Ecorr) to a protective potential in the immunity region.
The required cathodic protection current is supplied by sacrificial anode materials or by an impressed current system. Most metals in contact with an aqueous environment having a near neutral pH can be cathodically protected. |
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| Typical cathodic polarization curve for steel |
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| Five 300 ampere marine oil cooled rectifiers. Units are supported by an automatic de-watering oil spill containment pan. |
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| Six-anode cast iron sled complete with integrated cable and protective hose. Operation capacity of 75 amperes for 15 years. |
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| Ductile municipal watermain protected from corrosion using tape wrap coating and sacrificial magnesium anodes. |
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| 96 kilogram (210 lb.) sacrificial aluminum anodes used for the protection of marine pipe pile structures. |
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| Tubular cast iron anodes installed in a 300ft deep well complete with vent pipe and carrier pipe for coke installation from the bottom of the well up. |
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| Conventional groundbed using petroleum coke backfill and 2" cast iron anodes. |
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| Over-the-line potential survey being performed using GPS synchronized data recorder and interrupters. |
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| 90' diameter tanks protected using an Impressed Current system using titanium mixed metal oxide anodes. |
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- Petroleum & Petrochemical: underground piping and storage tanks, above ground storage tank bottoms, internal surfaces of water storage tanks, heat exchangers and storage well casings
- Marine: ships, barges, buoys, steel or reinforced concrete dock structures, offshore pipelines, offshore drilling and production platforms
- Pulp & Paper: effluent clarifiers, underground piping, aboveground storage tanks bottoms, foundation pilings, watermains and effluent discharge piping
- Reinforced concrete structures: bridges, parking garages and foundations
- Municipal: foundation pilings, iron and steel watermains, concrete pressure pipes, sewage treatment clarifiers, sewage pump stations
- Electrical Power Industry: cooling water pipelines & intakes, grounding systems, tower footings, penstocks, condensers
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Date : Feb-00
Author : R.A. Gummow
Notes : NACE Ottawa (10/99) & Materials Performance (2/00) |
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| Since its introduction in 1824, cathodic protection (CP) technology has developed to become a fundamental tool for preventing corrosion on municipal infrastructure. Potable water storage tanks and piping, prestressed concrete cylinder pipe, reinforced concrete structures, bridges, parking structures, underground fuel tanks, and effluent treatment clarifiers now benefit from this technology. |
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Date : March-98
Author : J.I. Munro / S.M. Segall
Notes : NACE Corrosion 98 |
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| Issues considered during the design of an impressed current type cathodic protection (ICCP) system for corrosion control on the submerged external surfaces of the steel ice shields on the bridge piers are presented. The challenges and cathodic protection (CP) system design solutions, associated with providing protection to the underwater CP components against ice damage, are discussed. The ICCP system is described including the different CP equipment arrangements utilized, based on the various pier configurations and construction methods. Results of the system effectiveness are also discussed. |
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