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08263 Corrosion Problems and Corrosion Mitigation Experiences on 6Mo Stainless Steel Seawater Systems on The Sleipner Platforms - North Sea

Picture for 08263 Corrosion Problems and Corrosion Mitigation Experiences on 6Mo Stainless Steel Seawater System
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Product Number: 51300-08263-SG
ISBN: 08263 2008 CP
Author: Svenn Magne Wigen and Stale Nodland
Publication Date: 2008
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Sleipner A was installed in 1992/93. The seawater piping was made in 6Mo stainless steel with some 25Cr duplex valves. The piping system contained chlorinated seawater. After approx. 18 months in service several leaks were observed in the firewater system due to crevice corrosion in valve components, flange sealing areas and threaded components. To avoid more leaks it was decided to install internal cathodic protection in both the firewater and seawater systems. In 1996 Resistor controlled Cathodic Protection - RCP was installed using available flanges and fitting access points. This was one of the pilots in the early phase of the Resistor controlled Cathodic Protection system designs. The design gave a range of anode lifetimes from 5 to 30 years. The paper will review 10 years of operational experiences from the Sleipner A & T platforms, from solving some initial problems with the CP system, through historical monitoring data with comparisons between monitoring data and design values and change out of anodes after ended lifetime.
Sleipner A was installed in 1992/93. The seawater piping was made in 6Mo stainless steel with some 25Cr duplex valves. The piping system contained chlorinated seawater. After approx. 18 months in service several leaks were observed in the firewater system due to crevice corrosion in valve components, flange sealing areas and threaded components. To avoid more leaks it was decided to install internal cathodic protection in both the firewater and seawater systems. In 1996 Resistor controlled Cathodic Protection - RCP was installed using available flanges and fitting access points. This was one of the pilots in the early phase of the Resistor controlled Cathodic Protection system designs. The design gave a range of anode lifetimes from 5 to 30 years. The paper will review 10 years of operational experiences from the Sleipner A & T platforms, from solving some initial problems with the CP system, through historical monitoring data with comparisons between monitoring data and design values and change out of anodes after ended lifetime.
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