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Cathodic protection (CP; / k æ ˈ θ ɒ d ɪ k / ⓘ) is a technique used to control the corrosion of a metal surface by making it the cathode of an electrochemical cell. [1] A simple method of protection connects the metal to be protected to a more easily corroded "sacrificial metal" to act as the anode. The sacrificial metal then corrodes ...
DCVG (direct current voltage gradient) is a survey technique used for assessing the effectiveness of corrosion protection on buried steel structures. [1] In particular, oil and natural gas pipelines are routinely monitored using this technique to help locate coating faults and highlight deficiencies in their cathodic protection (CP) strategies.
The pipeline project was proposed in 1978 as an export pipeline from Yamburg gas field, but was later changed to the pipeline from Urengoy field, which was already in use. In July 1981, a consortium of German banks, led by Deutsche Bank , and the AKA Ausfuhrkredit GmbH agreed to provide 3.4 billion Deutsche Mark in credits for the compressor ...
Anodic inhibitors and cathodic inhibitors are the two main categories of corrosion inhibitors. While cathodic inhibitors act as catalysts to slow down corrosion, anodic inhibitors protect metal surfaces by acting as physical barriers. They can also be divided into organic and inorganic corrosion inhibitors based on their chemical composition. [1]
For example, using an epoxy coating on the interior surface of a pipeline can reduce the likelihood of SCC. [7] Cathodic Protection: Cathodic protection is a technique used to protect metals from corrosion by applying a small electrical current to the metal surface.
Within a cathodic protection system there are a multitude of connection requirements for anode cables, measuring posts etc., being extremely versatile, the pin brazing system is ideally suited to this. Attachments can be made vertically, horizontally or even overhead.
Certain areas of the pipeline also require replacing depleted areas of cathodic protection, which protect the pipeline from rust and potential leaks. In 2015, the cathodic protection system of the pipeline that passes through the Mojave National Preserve needed to be repaired. [5] This repair construction disrupts nearby habitats.
Corrosion prevention measures, including Cathodic protection, designing to prevent corrosion and coating of structures fall within the regime of corrosion engineering. However, corrosion science and engineering go hand-in-hand and they cannot be separated: it is a permanent marriage to produce new and better methods of protection from time to time.