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This AMPP standard practice provides information for the material selection and welding procedures needed for optimum corrosion resistance of washwater discharge stub pipe in marine exhaust gas cleaning systems (EGCS, also known as scrubbers). The intended audience of the standard is shipyards, scrubber system manufacturers, installers, marine engineering firms, classification societies, flag state representatives (e.g., U.S. Coast Guard), ship owners, and ship operators.
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This Technical Report provides sound technical information on the corrosion risk of exhaust gas scrubbers to ship owners, shipyards, marine engineers, scrubber designers and suppliers. Marine scrubbers used on ships are mainly wet scrubbers, which are open-loop, closed-loop, or hybrid types. Each system is discussed with respect to a description of each type of scrubber, washwater environments, materials of construction (metals and non-metals), pitfalls of inspection, fabrication, and welding of metals, service performance and applications history including descriptions of corrosion failures and successes, and repair and maintenance guidance.