DNV-RP-B401 PDF

Whilst the requirements and recommendations are general, this document contains advice on how amendments can be made to include project specific requirements. Some of the design recommendations and methods in Sec. This RP is primarily intended for CP of permanently installed offshore structures associated with the production of oil and gas. Mobile installations for oil and gas production like semi-submersibles, jack-ups and mono-hull vessels are not included in the scope of this document.

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Cathodic protection CP is a method of corrosion control that can be applied to buried and submerged metallic structures. It is normally used in conjunction with coatings and can be considered as a secondary corrosion control technique.

Why is it Important? The Principles of Cathodic Protection Useful metals are often extracted from their naturally existing states as ores to be commerically and industrially viable. This process is often known as corrosion in layman terms and the most common example notable in everyday life is the rusting of iron and its various alloys, an example being steel.

Advantages and Uses of Cathodic Protection The primary benefit Cathodic Protection offers over other anti-corrosion systems is its ability to be deployed merely by the mantainenece of a Direct Current Circuit. Also, the effectiveness of the applied Cathodic Protection can be easily monitored as well as regulated by adjusting the properties of the Direct Current passing through the system.

It can also work hand with hand with Anti-Corrosion coatings, where the coatings may have been copromised. Cathodic where necessary can also assist as corrosion engineers for CP design, service work and corrosion inspection and testing. Protection and Systems.

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Cathodic protection markers over a gas pipeline in Leeds , West Yorkshire , England. Hazardous product pipelines are routinely protected by a coating supplemented with cathodic protection. An impressed current cathodic protection system ICCP for a pipeline consists of a DC power source, often an AC powered transformer rectifier and an anode, or array of anodes buried in the ground the anode groundbed. The DC power source would typically have a DC output of up to 50 amperes and 50 volts , but this depends on several factors, such as the size of the pipeline and coating quality. The positive DC output terminal would be connected via cables to the anode array, while another cable would connect the negative terminal of the rectifier to the pipeline, preferably through junction boxes to allow measurements to be taken. The choice of groundbed type and size depends on the application, location and soil resistivity.

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DNVGL-RP-B401

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