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Topic: Cathodic protection


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In the News (Thu 23 May 19)

  
  Cathodic protection
Cathodic protection is often applied to coated structures, with the coating providing the primary form of corrosion protection.
Cathodic protection has probably become the most widely used method for preventing the corrosion deterioration of metallic structures in contact with any forms of electrolytically conducting environments, i.e.
Cathodic protection basically reduces the corrosion rate of a metallic structure by reducing its corrosion potential, bringing the metal closer to an immune state.
www.corrosion-doctors.org /CP/Introduction.htm   (412 words)

  
  SESCO, Inc. :: Cathodic Protection Engineering
The zinc is being corroded, and the steel pipe is being polarized and protected from corrosion.
Cathodic Protection can be defined as…the control of electrolytic corrosion…by the application of direct current in such a way that the structure to be protected is made to act as the cathode of an electrolyte cell.
This is a basic criterion for the cathodic protection of a buried structure.
www.sescocp.com /tutorial.php   (3887 words)

  
 Patents in Class 204/196.33
A cathodic protection system for internal surfaces of a pipeline is provided which includes a flexible anode assembly having a first and a second end and having at least one flexible anode wire having a first end and a second end.
Cathodic protection of concrete-reinforcing steel reinforcing elements is accomplished utilizing an anode of a metal (e.g.
Protection from corrosive effects of water in hot water tanks is provided by an electrochemically active noble metal type anode disposed in the hot water tank and supplied by a selected level of current passing from the anode through the...
www.freepatentsonline.com /CCL204-196.33.html   (1510 words)

  
 Oilfield Glossary: Term 'cathodic protection'
Cathodic protection does not eliminate corrosion, it transfers corrosion from the structure under protection to a known location where artificial anodes (plates or metal bars) are placed and could be replaced easily.
The cathodic protection principle is based on the electrochemical nature of the corrosion phenomena; the anodic area corrodes (current is discharged) and the cathodic area does not corrode (current is received).
Cathodic protection overrides the naturally occurring anodic areas inside a structure, thus turning the structure under protection completely cathodic, which means it receives current from the surrounding electrolyte (for example, soils, water) and does not corrode.
www.glossary.oilfield.slb.com /Display.cfm?Term=cathodic%20protection   (173 words)

  
 Cathodic Protection Control from ETA Engineering
Cathodic Protection (CP) works by impressing a current on a metallic structure that is in contact with the earth, such that the structure is maintained at a negative voltage (usually about -.85 to -1.1 vdc) with respect to a copper/copper sulfate half cell in contact with the earth.
Cathodic Protection is used to protect pipelines, steel tanks, well casings, and even highway bridges.
A Cathodic Protection or Corrosion Engineer should be contacted to evaluate the application and to specify the ground bed type and dimensions along with the current and voltage requirements.
www.etaengineering.com /cathodic/intro.shtml   (505 words)

  
 Facts
Cathodic protection is an external electrical system which provides small currents which counteract the electrical currents of the corrosion cell.Cathodic protection thereby removes one part of the corrosion cell and corrosion ceases.
Cathodic protection has successfully been used to protect steel in concrete since about 1973, but has been used to protect steel in many other electrolytes since about 1823.
Cathodic protection is neither mystical nor complicated: it is a straight-forward application of basic laws of electrochemistry.
www.cathodicprotection.com /cpfacts.htm   (449 words)

  
 Cathodic Protection Co. Ltd
Cathodic Protection Co. Ltd have been appointed as an exclusive territory distributor for the...
Founded in 1950, Cathodic Protection Co. Limited was one of the first companies in the United Kingdom set up specifically to provide equipment and engineering services for cathodic protection of high pressure gas and oil pipelines, marine structures and storage facilities.
In addition to cathodic protection marine equipment, we manufacture the electrolytic 'Cuprion' ™ marine growth anti-fouling system used on the seawater intakes of process plants and offshore platforms, to prevent the harmful accumulation of marine growth.
www.cathodic.co.uk   (238 words)

  
 TDEC: Underground Storage Tanks: Compliance Corner: Cathodic Protection
This Cathodic Protection Monitoring Form was developed for use in testing both passive (galvanic) systems like the Steel Tank Institute’s STI-P3 systems as well as active systems where an impressed current system has been installed.
Cathodic protection testers may use other forms as long as the information provided is essentially the same as what is required on this form.
If cathodic protection is added to a lined tank, internal inspections are no longer required if the proper procedures have been followed.
www.state.tn.us /environment/ust/compliance/CathProt.shtml   (965 words)

  
 Cathodic Protection
Cathodic protection effectively protects underground or submerged metallic structures through the use of a negative potential applied by an external source to the structure.
Where a protected structure, or the anode(s) or groundbed(s), lies near to other buried or immersed metallic structures that are not fully insulated from earth, the latter(secondary strucures may, at certain points, pick up a portion of protection current due to potential gradients in the soil or water and return it to earth at others.
Cathodic protection system specifications for design phase of a 36 inch diameter ductile iron river-water pumping station and feasibility study for a new coking facility having over 4 miles of underground water, air and fuel gal lines.
www.matcoinc.com /?type=cc&id=363   (1452 words)

  
 Excite Deutschland - Business - Construction and Maintenance - Materials and Supplies - Site Construction - Cathodic ...
Cathodic protection supplies and installations for ships, tanks, and underground pipelines.
Cathodic protection materials, equipment and supplies for corrosion control.
International provider of cathodic protection power supplies, designs, manufactures, and sells photovoltaic power supplies, rectifiers, and other equipment for cathodic protection.
www.excite.de /directory/Business/Construction_and_Maintenance/Materials_and_Supplies/Site_Construction/Cathodic_Protection   (945 words)

  
 Cathodic Protection for Marine Structures
The preferred technique for mitigating marine corrosion, based on historical performance and measurable results, is cathodic protection (CP) - the practice of using electrochemical reactions to prevent the corrosion of steel structures.
Standard industry practice for cathodic protection in new construction includes the installation of sacrificial anodes, such as aluminum and zinc.
Due to the ductility of the titanium substrate, a wide range of anode shapes suitable to the structure to be protected are possible, such as wire, rod, tubular, disk and mesh configurations.
www.farwst.com /fwst/anodimpr/elg04.htm   (925 words)

  
 Cathodic Protection Operation and Maintenance Requirements
Corrosion protection is also provided if tank and piping are completely isolated from contact with the surrounding soil by being enclosed in noncorrodible material (sometimes called "jacketed" with noncorrodible material).
The UST system is protected because the current going to the UST system overcomes the corrosion-causing current normally flowing away from it.
A qualified cathodic protection tester must test the system within six months after installation and every three years thereafter.
www.state.sd.us /denr/des/ground/tanks/cathodicprotection.htm   (426 words)

  
 UST Technical Compendium Category 2: New/Upgraded UST Systems (NUS) | Office of Underground Storage Tanks (OUST) | US ...
Question 6: The technical regulations require owners/operators to check their cathodic protection within six months after a tank is installed, then every three years thereafter.
Cathodic protection monitoring is required for all tanks that have cathodic protection.
Note: In cases where cathodic protection is retrofitted to a previously installed ACT-100 or ACT-100-U tank, cathodic protection monitoring is required because the status of the cladding cannot be determined.
www.epa.gov /swerust1/compend/nus.htm   (2037 words)

  
 242-Retrofit Cathodic Protection of Marine Pipelines Associated with Petroleum Production
Development of a model or models that will provide criteria for cathodic protection retrofits for offshore pipelines.
The project would be based on recently developed relationships between cathodic protection potential and electric current density for sacrificially protected steel in sea water.
Hartt, William H., Retrofit Cathodic Protection Of Marine Pipelines Associated with Petroleum Production, Progress Report, submitted by Florida Atlantic University, Dania Beach, Florida, May 18, 2000.
www.mms.gov /tarprojects/242.htm   (182 words)

  
 Cathodic Protection
Northern Arizona Wind & Sun has been doing cathodic protection systems for oil and gas wells and pipelines for over 20 years.
We have sold and/or installed hundreds of cathodic protection power systems in the USA and for use around the world.
We are the exclusive North American dealers for the specialized AERL CP controllers, which can save you from 20% to 60% on the cost of a solar powered CP system.
store.solar-electric.com /capr.html   (234 words)

  
 Cathodic Protection   (Site not responding. Last check: )
Cathodic protection for the flow loop piping consists of anodes placed at twelve locations around the loop.
An existing anode bed near the northwest leg of the flow loop was removed prior to installation of the flow loop cathodic protection system.
Cathodic protection test stations required removal of the pipe coating, cleaning the exposed steel, attaching the specified wires using thermite welds, patching the pipe coating, securing the wires, bringing the wires to the surface, installing a permanent test station after cleanup, and installing and connecting the reference anodes.
www.battelle.org /pipetechnology/FLOWLOOP/Links/CathodicProtection.htm   (217 words)

  
 May 2001: Cathodic protection of water storage tanks saves money --a case study   (Site not responding. Last check: )
Interior wet surface areas are a different matter and prudent owners apply cathodic protection in conjunction with appropriate coatings to prevent corrosion and extend the life of the coating.
Cathodic protection for water storage tanks has been recommended by the steel plate fabricators, independent tank inspection companies and owners throughout the country.
Cathodic protection has been proven to double, triple or even quadruple the life of the interior submerged coating, thereby saving the owners tens or even hundreds of thousands of dollars over the life of the tank.
www.esemag.com /0501/cathodic.html   (435 words)

  
 BEASY Cathodic Protection System
Cathodic protection systems are used extensively to prevent steel structures from corroding, especially when failure of the structure will have serious consequences, such as loss of life and/or injury, and damage to property and/or environment.
Designing a cathodic protection system to protect the external surface or floors on a number of large, above ground chemical storage tanks located in close proximity to each other offers a significant challenge if cathodic protection interference is to be minimised.
The external floors of all three tanks are to be cathodically protected using anode groundbeds, as shown in the picture.
www.beasy.com /demo/contour.html   (491 words)

  
 Cathodic Protection
Cathodic protection was first developed by Sir Humphrey Davy in 1824 as a means of controlling corrosion on British naval ships.
This combination of protective coating and cathodic protection is used on virtually all immersed or buried carbon steel structures, with the exception of offshore petroleum production platforms and reinforced concrete structures.
The voltage differences between anode and cathode are limited in sacrificial anode systems to approximately 1 V or even less, depending on the anode material and the specific environment.
www.mtec.or.th /th/research/famd/corro/cathodic.htm   (1188 words)

  
 Underground Storage Tank (UST) Systems - Minnesota Pollution Control Agency
The corrosion protection systems must be tested every three years by a certified cathodic protection tester to insure the system is properly working and records should be maintained for 10 years.
Cathodic protection testing must be performed by a cathodic protection tester who obtains 3rd party certification pursuant to Minn. R.
Cathodic protection testers must have education, experience, and documented competence in topics relating to soil resistivity, stray current, structure-to-soil potential, and component electrical isolation measurements of buried metal piping and tank systems.
www.pca.state.mn.us /cleanup/ust.html   (2303 words)

  
 Bencor Corrosion Control Specialists (Cathodic Protection)
Cathodic protection is an electrical process used for corrosion control of buried or submerged structures.
Corrosion is no longer accepted as an inevitable part of nature, and cathodic protection is one of the most effective and widely used means to prevent this waste.
Cathodic protection can only be used to protect piping from external (soil-side) corrosion.
www.ebencor.com /cathodic.html   (188 words)

  
 Cathodic- Protection -Training-Course
Cathodic Protection is an electrochemical means of corrosion control in which the oxidation reaction in a galvanic cell is concentrated at the anode and suppresses corrosion of the cathode in the same cell.
The steel pipeline is cathodically protected by its connection to a sacrificial magnesium anode buried in the same soil electrolyte.
Figure 3: Impressed-current cathodic protection of a buried pipeline using graphite anodes
www.kiccnet.com /Cathodic-Protection.htm   (86 words)

  
 Structural Systems Limited - Services >> Remedial >> Cathodic Protection
Cathodic Protection systems use electro-chemical techniques to control the deterioration of steel or concrete.
Cathodic Protection is a highly technical field, and Structural Systems has a successful track record over more than ten years on major Government and infrastructure CP projects.
Cathodic protection may be active or passive to suit different situations.
www.structuralsystems.com.au /SSL/Services/Remedial-Cathodic.asp?L1=3&L2=4&L3=5   (228 words)

  
 Cathodic Protection Design Methods and Current Mapping for Bridges
Uniform cathodic protection of concrete structures like bridges, roads, parking garages etc., is essential to reduce the corrosion of the rebar and subsequent degrading of the entire structure.
During the past 30 years the use of cathodic protection has increased and can now represent up to 15% of the installed cost plus a continued maintenance and management cost over the lifetime of the bridge.
In addition this technology will map current systems to determine their performance and interpret the results and suggest potential modifications to the cathodic protection grid or identify areas of the structure that are prone to corrosion.
www.jhuapl.edu /ott/technologies/technology/articles/P01293.asp   (177 words)

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