General

This standard covers aspects of corrosion control and monitoring in seawater injection systems.

Most seawater injection systems rely on coatings, liners, plastics, composite materials, and corrosion-resistant alloys (CRAs) to overcome potential corrosion problems prior to deoxygenation. The practices in this standard concentrate more on controlling and monitoring corrosion in facilities downstream from deoxygenation, but also address some of the aspects relevant to selection of appropriate mitigation and control methods for upstream service conditions. The standard also addresses materials selection for seawater injection systems.

This standard presents practices for controlling and monitoring corrosion in seawater injection systems. However, many of these practices may be applied to other types of water injection systems, such as:

(a) Systems for reinjection of produced water;

(b) Aquifer-sourced water injection systems; and

(c) River or surface water injection systems.

Figure 1 shows a typical layout of a water injection system—in this case, an offshore application. The purpose of Figure 1 is to show equipment items typically associated with water injection systems and common fluid treatments and monitoring types and locations. It does not show all items of equipment or all possible fluid treatments or monitoring types that can be used in water injection systems.

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