Corrosion coupon cathodic protection

The level of CP current that is applied from impressed current systems is important.

Too little current will lead to corrosion damage; excessive current can lead to disbanding of the coating and hydrogen embrittlement. For these reasons impressed current systems require regular monitoring. It results from the corrosive electrolytic reaction between the buried pipe and its surrounding soil the electrolyte.


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It is actually measured between the pipeline and a reference electrode most commonly copper sulphate , placed in the soil directly over the pipeline. It is also known as the ON potential because the measurement is made while the CP system is energised. Instant OFF Potential - When a pipe-to-soil measurement is made, the pipeline potential will appear to be more negative then its true potential, due to IR drop errors. The instant OFF measurement corrects for these errors; the CP current is briefly interrupted to produce a "true" pipe-to-soil potential, free from undesirable IR drop effects and before any appreciable depolarisation has occurred.

Corrosion prevention is our specialty

This is a truer measure of the level of protection afforded to the pipeline. If it is not possible to disconnect the CP momentarily then an alternative approach is the use of a corrosion coupon see below. Coupon Current - Corrosion coupons connected to cathodically-protected structures can be used to monitor the effectiveness of the CP system. A coupon is a representative sample of the pipeline material, buried close to the pipe so that it is subjected to the same environment.

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Cathodic Protection Coupon Use for Buried Piping in Plant (i.e. Complex) Facilities

Connected to the pipeline via a test post, it simulates how the pipeline would react if there were a defect often referred to as a "holiday" in its coating. It is especially useful when it is not possible to interrupt the CP system, since instant OFF potentials can conveniently be measured by interrupting the CP connection to the coupon. The surface area of the coupon allows the current density to be calculated.

Corrosion Coupons Animation

However, they are only representative of the pipeline at that point — and for a short length either side. A direct connection is made to the pipeline and this trailing wire is unwound from a spool as the technician walks along its length. As he goes, the TR current output is interrupted to enable the technician to take a pipe-to-soil OFF potential measurement at approximately 1m intervals.

On pipelines with multiple TRs, all the outputs or at least those that influence the potential measurement at that point have to be interrupted synchronously. Interruption cycle times vary but the selected "on" period is longer than the "off" period to limit depolarisation of the pipeline during the survey.

Cathodic Protection - Berkeley Springs Instruments

DCVG is used for locating and sizing defects in the coating of the pipeline. Measurement of the voltage gradient at the surface above the pipeline enables even small flaws to be detected and positioned accurately. Rectifiers can be configured to synchronise and interrupt their output simply by sending a message from a cellphone. Used in conjunction with specific MERLIN Transformer Rectifier Monitors , it enables interruption switching of the current output at a rectifier or solar station to be controlled remotely.


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The Interrupter fails safe and switches the rectifier output loads encountered under the temperature, environmental and electrical conditions experienced in a rectifier cabinet. The solid state circuitry overcomes the limitations of electromechanical relays. All pipeline operators use CP extensively on their transmission pipelines.

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The big advantage of CP over other forms of corrosion treatment is that it is applied very simply by maintaining a DC circuit and its effectiveness can be monitored continuously. Because of the importance of CP in protecting the pipe, operators are required to take and report regular measurements of CP data, both of the levels of protection applied to the pipe at source and the in situ levels measured along the pipe itself. The frequency of measurements at the various points is generally in compliance with NACE guidelines. Pipeline operators are responsible for providing their national regulatory body with evidence that their monitoring is adequate to demonstrate effective management of their CP systems.

Please join us in support of our teammate Michael Wooten. Availability: In stock. Cathodic protection coupons are a simple, size-specific piece of metal with one or more wires attached and are used for evaluating corrosion control or cathodic protection systems protecting a structure, typically a steel pipeline. These measurments includes:. Coupons are provided in a variety of size ranges depending on the application. Currently, the two most popular sizes are 1 cm 2 and 10 cm 2.

Just What is Cathodic Protection?

In addition to the coupon size, there are different physical configurations as well. In addition to our 10 cm 2 range of coupons, Farwest provides a 1 cm 2 coupon made from alloy steel. Coupon Ordering Information. A detailed drawing is available for this coupon model. Please contact your local Farwest representative for this information, pricing or other needed information. Please can you fill in the information below to access our manuals or sign in. Please enter your email address below to keep up to date with all the latest news and information from Buckleys. Join Our Newsletter. T-Handle pipeline probe - mm AC mitigation device