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PA2 was initially developed when the only instruments available were the Banana gauge and basic analogue and digital DFT gauges. Gauges now have memory, limits and scanning technology amongst other features. Scanning technology in DFT measurement has been available for some time now, but only recently has work begun on the standards to incorporate this technology.
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This standard practice provides a standardized method of measuring hull roughness to enable reproducible and comparable readings from similar gauges regardless of geographical location.
One of the factors affecting a ship's performance and fuel consumption is the roughness of its foul-free underwater hull. the Condition and type of paint system used may have a major influence on hull roughness and ship performance. Hull roughness has a major impact on vessel fuel efficiency and exhaust emissions. This standard focuses on the mechanical roughness of the hull.
HISTORICAL DOCUMENT. Measuring hull roughness of vessels in dry-dock. Limited to a methodology—no interpretation presented. Hull roughness has a major impact on vessel fuel efficiency.