Pipeline coupon corrosion

Corrosion coupons orientation should be consistent in order to assess and compare different data sets. Typically, a corrosion coupon should be oriented in a direction parallel to the process flow.

Corrosion coupon plug ejected from pressurised pipeline - SAFETY4SEA

The best representation of flow in a given system will be achieved by using flush mounted coupons rather than intrusive coupons. Typically, at any coupon monitoring point, more than one coupon is installed for two reasons:.

Chiller - Corrosion Coupon Rack - Chemical Treatment Piping - HVAC

Many uncontrollable factors may exist and reduce the accuracy of a single coupon. The use of paired coupons, with an average value taken, substantially improves data reliability and accuracy. Corrosion coupons give an indication of the corrosion that has already occurred. If it is required to verify whether the corrosion rate was uniform or varying over a certain time, then multiple corrosion coupons could be installed at the same location and retrieved at different times. There are many different coupon types. The most common coupon types are described below and presented in Figure A coupon holder is used to fix two or more coupons at a certain location.

What is the main function of corrosion coupon

Depending on the operating conditions, number and type of coupons, configuration and system entry method, the coupon holder is selected. Previous story. Next story.

Back to news archive. We recruit and develop the most talented individuals because as a growing company we're only as good as our team. Why are corrosion coupons used? Advantages: Simplicity — No electronic monitoring equipment is required Versatility — The technique is extremely versatile because weight loss coupons can be fabricated from any commercially available alloy.

Galvanic Corrosion — Corrosion coupons are typically isolated from any metal-metal contact. Thus, they are unaffected by the galvanic interactions present in the system. Corrosion coupons should be located where corrosion is expected. Corrosion coupons provide the general and pitting corrosion rates. The general corrosion rate is assessed through metal loss from the coupons over a certain time period. The worst pitting corrosion rate is assessed using the depth of the deepest pit over a period of time.

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Several factors should be taken into consideration during the interpretation of corrosion coupon data; such as:. To ensure effective monitoring in a given system, coupons should be placed throughout the different areas in the system where the worst-case corrosion rates are predicted. Long exposure to the service fluid months is required to evaluate corrosion rates. It should be noted that some conditions such as bacteria fouling take time to develop on the coupon surface.

Corrosion coupons orientation should be consistent in order to assess and compare different data sets. Typically, a corrosion coupon should be oriented in a direction parallel to the process flow. The best representation of flow in a given system will be achieved by using flush mounted coupons rather than intrusive coupons.

Typically, at any coupon monitoring point, more than one coupon is installed for two reasons:. Many uncontrollable factors may exist and reduce the accuracy of a single coupon. The use of paired coupons, with an average value taken, substantially improves data reliability and accuracy. Corrosion coupons give an indication of the corrosion that has already occurred.


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If it is required to verify whether the corrosion rate was uniform or varying over a certain time, then multiple corrosion coupons could be installed at the same location and retrieved at different times. Significant factors are locating coupons in representative areas and keeping adequate records of the analysis.

Corrosion Coupons

Corrosion coupons are designed to be installed in fluid systems to measure the amount, type and rate of corrosion occurring. After being installed for an adequate amount of time typically days , coupons are removed and returned to EnhanceCo for analysis.

Analysis includes cleaning, reweighing, examining and reporting the results in a graphic representation for ease of understanding. We have recently added increased capabilities for analysis to include pit morphology, pit depth and high magnification photography.