can be undertaken. The advantage of coupons is that they are relatively inexpensive, the weight loss result is positive, samples of corrosion product or bacterial can be obtained from the surface for further observation and testing, and coupons are not subject to instrument failure such as the electronic. Any corrosion coupon should be certified by recording its serial number, weight in grams, dimensions, material, and surface finish. Coupons can also be of different shapes and typesrectangular, circular, or helicaland may be normal or prestressed. Weight loss corrosion coupons Weight loss corrosion coupons are probably the oldest and still most widely used method of corrosion monitoring. A monitoring instrument at an unrepresentative location can provide erroneous data that could be widely exaggerating or totally missing any ongoing corrosion. Also, using appropriate geometric designs, a wide variety of corrosive environments may be studied. Both corrosion coupons and probes are intrusive types, in direct contact with the liquid measuring the corrosivity of the liquid. Coupons will give an average rate of corrosion from the time the coupon was installed and the time it was removed from the system. Nonintrusive types, such as hydrogen probes or special belts and mats, are placed on the external side of the pipeline.
AIE Introduction to, corrosion, coupons
Why are corrosion coupons used? Online corrosion coupons have been widely used in critical process circuits for assessment of fluid corrosivity. Corrosion coupons are an excellent source of corrosion information if monitoring is carried out correctly and maintained continuously. Before installation the coupon must be clean (i.e., free of any corrosion, grease marks, drops of perspiration, etc.) and weighed. Depending on the operating conditions, number and type of coupons, configuration and system entry method, the coupon holder is selected. The method involves exposing a specimen of material (the coupon) to a process environment for a given duration, then removing the specimen for analysis. Ramesh Singh, in, pipeline Integrity Handbook (Second Edition), 2017. They can also be used to estimate the effectiveness of the mitigation program in place or evaluate the suitability of a specific material for a specific system. If you would like to further understand how our corrosion management team can support your corrosion assessment and/or management requirements, please visit our contact us page.
Corrosion coupon installation procedure Valve Welding Preparation, Installation, Analysis, and Interpretation
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