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96559 INTERNAL CATHODIC PROTECTION OF SEAWATER PIPING SYSTEM BY THE USE OF THE RCP METHOD

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Product Number: 51300-96559-SG
ISBN: 96559 1996 CP
Author: Roy Johnsen, Per O. Gartland, Stein Valen, John M. Drugli
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During the last ten years high alloyed stainless steels with 6% molybdenum (6Mo) or 25%Cr (super duplex) have been the most popular materials for seawater systems on offshore installations in the North Sea. The basis for this material selection was to obtain maintenance free systems with long lifetime. However, practical experience has shown that corrosion failures can occour. This paper presents a simple and economical method to avoid corrosion problems internally in piping systems transporting chlorinated seawater. The method is called RCP – Resistor controlled Cathodic Protection. Principles of the method including protection potential, current density requirements and anode design in addition to different practical applications are described.
During the last ten years high alloyed stainless steels with 6% molybdenum (6Mo) or 25%Cr (super duplex) have been the most popular materials for seawater systems on offshore installations in the North Sea. The basis for this material selection was to obtain maintenance free systems with long lifetime. However, practical experience has shown that corrosion failures can occour. This paper presents a simple and economical method to avoid corrosion problems internally in piping systems transporting chlorinated seawater. The method is called RCP – Resistor controlled Cathodic Protection. Principles of the method including protection potential, current density requirements and anode design in addition to different practical applications are described.
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Due to failure of internal coatings in the high pressure and test separators on offshore production facilities, the option to install an internal cathodic protection system was considered.
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