Flow Accelerated Corrosion in Piping System of Marine Boiler Plant

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A disaster happened in a nuclear power plant in Japan in August 2004, which was caused by failure of condensation water pipe in the secondary line. Shipping industries are concerned for possibility of occurrence of such a disaster in ships due to its construction similarity to marine boiler plant in steam, feed water, and condensation piping for main or auxiliary boilers. Nippon Kaiji Kyokai has therefore investigated and gathered data of piping lines corrosion in ships collaborated with major Japanese shipowners right after the disaster. The results show that similar corrosion failure as in the nuclear power plant has occurred in shipboard steam/feed water/condensation water pipes for main and auxiliary boiler plants without causing severe consequences. It is also found that this kind of failure, named"Flow Accelerated Corrosion"and referred to as"FAC", is caused by erosion-corrosion at a place where the flow is extremely turbulent, such as a location right downstream side of an orifice or a control valve, or at bend parts including elbows, etc., under strong influence of temperature, flow velocity or pH of the fluid. The wall thickness measurements on actual pipe lines of steam, condensation water and feed water at bend parts, at T-junctions, behind orifices, behind valves and at diffusers/reducers with a ultrasonic thickness gauge show a very definite evidence of a reduction in wall thickness of carbon steel piping. It was confirmed that the amount of actual reduction in wall thickness could be well predicted by Kastner Equation.

Flow Accelerated Corrosion in Piping System of Marine Boiler Plant

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