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Corrosion trending covers all aspects of monitoring and inspection and their integration into an effective strategy essential to fit-for-service (FFS) facilities. This involves having, at all times, full understanding of internal and external exposure conditions, and a sound knowledge of the physical condition of each component within an asset. The term corrosion trending is used in this chapter to identify the integration of monitoring and inspection in detecting and quantifying the presence of a corrosion threat and its timely and sustained mitigation. While the current condition of the equipment can be determined using inspection techniques, corrosion monitoring enables information to be gathered on the corrosivity of the environments that the equipment is exposed to. Inspection involves quantifying the equipment wall thicknesses and identifying defects using a range of available techniques. To complement inspection methods a leading indicator is needed; this is achieved in part by what corrosion monitoring provides by means of a range of techniques.
