Impressed Current Cathodic Protection System For Pipelines

These pipeline sections are protected against corrosion with an advanced impressed current cathodic protection system above hat combined with sacrificial anode protection from hat to lat. Continuous cable like anodes parallel with the pipelines. The galvanic system uses a sacrificial anode of a material having a higher potential on the electromotive series than the material to be protected fig.

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Distribution of cp system stations should take into consideration the total current required the pipeline attenuation characteristics the availability of power for impressed current cathodic protection systems varying soil regimes isolation valves and other factors to determine how many what size and where each cp system will be located.

Impressed current cathodic protection system for pipelines. Notice how an external dc power source is involved. The impressed current system. The dc power source would typically have a dc output of up to 50. Impressed current cathodic protection is a more economical method of cathodic protection when underground pipelines are offshore or long equipment is too large to protect via one or few galvanic anodes and electrons are supplied to the cathodic structure using an external dc power source.

Impressed current cathodic protection iccp systems consist of one or more reference electrodes and several iccp anodes which are all connected to a power unit. The external power source often a dc power supply provides the current necessary to drive the electrochemical reaction required for cathodic protection to occur. Schematic of an object being protected by an anode using impressed current cathodic protection iccp methods. 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 anode and cathode may be separate metals or areas of dissimilar potential on the same metal. The iccp system for the pipeline sections above hat consist of. In large pipeline networks there may be many crossings parallelism and approaches near the pipeline s cp system. Hazardous product pipelines are routinely protected by a coating supplemented with cathodic protection.

The reference cells measure the underwater electrical protection potential and based on this data the power unit regulates the required output to the anodes. There are two general methods of cathodic protection the galvanic system and. Pip ple00006 cathodic protection systems for pipelines june 2018 process industry practices page 3 of 23 cell. Rectifiers are the power source for impressed cathodic protection systems 6x per calendar year not to exceed 2 5 months bonds are the safe path to transfer current back to a foreign current source 6x per calendar year not to exceed 2 5 months test point voltage readings measured during the annual.

Electrochemical system consisting of an anode and a cathode immersed in an electrolyte. Limitations of cathodic protection. Impressed current cathodic protection iccp is a corrosion protection system consisting of sacrificial anodes connected to an external power source.