Corrosion coupons

General Info

The exposure of corrosion coupons is one of the oldest techniques for corrosion monitoring and, despite several drawbacks, it remains popular and widely used in various applications.

In the refining industry, coupons are mostly used in cooling water systems and overhead (OVHD) systems in crude distillation. Sometime they can also be used in amine units (various locations on rich and lean amine and regenerator OVHD), sour water (SW) strippers (mostly stripper OVHD), and other applications where multiphase, condensing systems with potential for deposition are encountered.

Installation

• Disc-type coupons installed on 2 inch flanged access nozzles are most commonly used in process units. Typical flange and coupon holder with disc coupons is shown on Figure 1.

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