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One of the key factors affecting ship performance, particularly fuel consumption and associated GHG (Green House Gas) emissions, is the degree of biofouling on the immersed hull and propeller(s). Rates of biofouling accumulation vary considerably, depending on the suitability, age and physical condition of the coating system(s) applied to the hull, the voyaging, anchoring and lay up patterns of the ship, and the geographical regions where these take place.
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This pictorial-based standard is designed to facilitate more consistent descriptions of the degree of biofouling on a vessel hulls, however it is not meant to define the overall fouling condition of the wetted hull.
Case histories show that non-visible contamination may result in rapid coating failure. Physical and chemical tests to detect same. Remediation measures. Reagents, materials, tools, procedures & results.
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HISTORICAL DOCUMENT. Assessing corrosion in the field. New: long-range ultrasonic testing (UT), fiber optic strain gauges; high-resolution electrical resistance (ER), a new method of hydrogen probe monitoring, and extended-analysis coupons.
Conference Paper - This paper describes the requirements of the standard, additional inspection points, and several uses of the standard in the field where clear specification language was imperative to successful project completion. NACE 5/SSPC-SP 12 standard confined to water jetting - which makes use of ultra-high pressure water that is nonabrasive. Four levels of visible post-cleaning condition and three levels of non-visible condition are defined.