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00435 A CASE HISTORY FOR THE MITIGATION OF SALT WATER INTRUSION INTO A BOILER STEAM CYCLE

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Product Number: 51300-00435-SG
ISBN: 00435 2000 CP
Author: David J. Domogala, P.E. and John A. Buffa, P.E., David P. Nesbitt, P.E.
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On May 22, 1998, Bridgeport Harbor Station Unit No. 3 operated for nearly four (4) hours with saltwater intrusion into the boiler water and steam systems via a condenser tube leak. After deliberate and detailed study with world-renown corrosion inspection and mitigation experts and EPRI, a plan of action was developed to mitigate the salt water intrusion from the boiler waterwall and steam system, in order to place these portions of the unit in a "before incident" condition. The boiler waterwall system was thoroughly recirculated and flushed with condensate, and then chemically cleaned prior to service. A complete turbine overall has been undertaken, a portion of which includes thorough blasting, surfactant soaking, rinsing and drying of all stages of steam buckets, diaphragms, and turbine blading. A multi-stage high velocity water flush was successfully completed to mitigate saltwater intrusion into the superheat and reheat steam systems. This paper describes the various processes used to successfully return the unit to normal, full load operation, with particular emphasis on the multi-stage high velocity water flush of the steam cycle. KEYWORDS: Chemical Cleaning, Steam Cycle, Turbine, Boiler, Saltwater, Salt, Intrusion, Superheat, Reheat
On May 22, 1998, Bridgeport Harbor Station Unit No. 3 operated for nearly four (4) hours with saltwater intrusion into the boiler water and steam systems via a condenser tube leak. After deliberate and detailed study with world-renown corrosion inspection and mitigation experts and EPRI, a plan of action was developed to mitigate the salt water intrusion from the boiler waterwall and steam system, in order to place these portions of the unit in a "before incident" condition. The boiler waterwall system was thoroughly recirculated and flushed with condensate, and then chemically cleaned prior to service. A complete turbine overall has been undertaken, a portion of which includes thorough blasting, surfactant soaking, rinsing and drying of all stages of steam buckets, diaphragms, and turbine blading. A multi-stage high velocity water flush was successfully completed to mitigate saltwater intrusion into the superheat and reheat steam systems. This paper describes the various processes used to successfully return the unit to normal, full load operation, with particular emphasis on the multi-stage high velocity water flush of the steam cycle. KEYWORDS: Chemical Cleaning, Steam Cycle, Turbine, Boiler, Saltwater, Salt, Intrusion, Superheat, Reheat
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This paper presents an unusual case example of recovery boiler waterside tube deterioration by a combination of SAC and phosphate hideout corrosion mechanisms. The case shows boiler tubes that exhibited through-wall corrosion and cracking.
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