A CORROSION PROTECTION SYSTEM FOR A NORTH SEA JACKET

The Oseberg "B" steel jacket is an eight-legged jacket with a design life of 40 years. To reduce weight, a corrosion system combining aluminium anodes and coal tar epoxy coating was chosen. Anode selection was based on experiments designed to detect possible tendencies to passivation during the period of low current consumption. Cylindrically shaped anodes of th Al-Zn-In type were chosen since they would give the lowest possible weight, reduce the drag forces on the jacket, and have the lowest probability of passivating. A permanent monitoring system was installed consisting of 20 pairs of reference electrodes and shunted anodes. Such a system simplifies offshore surveillance of the cathodic protection system, and also gives early warnings in the case of anode passivation. Results of monitoring the potential from the day of launch are presented.

• Supplemental Notes:
  • Materials Performance (Houston, Texas), 29 (1990) p.13 (May) [6 p., 2 ref., 3 tab., 8 fig.]
• Authors:
  • Lye, E R
• Publication Date: 1990

Language

• English

Subject/Index Terms

• TRT Terms: Cathodic protection; Corrosion; Monitoring; Offshore platforms
• Old TRIS Terms: Corrosion monitoring
• Subject Areas: Bridges and other structures; Marine Transportation;

Filing Info

• Accession Number: 00698132
• Record Type: Publication
• Source Agency: British Maritime Technology
• Files: TRIS
• Created Date: Aug 14 1995 12:00AM