Cathodic protection and coating

Conference · Sun Jan 01 04:00:00 EST 1989

OSTI ID:6984121

Lye, R E ^[1]

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1. Norsk Hydro Research Centre, N-3900 Porsgrunn (NO)

The Oseberg B steel jacket is an eight- legged jacket with a design life of forty years. In order to reduce weight a corrosion protection system combining aluminum anodes and coal tar epoxy coating was chosen. The entire jacket is coated. Anode selection was based on experiments designed to detect possible tendencies to passivation during the period of low current consumption. Cylindrically shaped anodes of the Al-Zn-In type were chosen since they would give the lowest possible weight, reduce the drag forces on the jacket and also 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 c.p. system, and also gives early warnings in case of anode passivation. Results of monitoring the potential from the day of launch are presented.

• OSTI ID: 6984121
• Report Number(s): CONF-890437--
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
022000* -- Petroleum-- Transport
Handling
& Storage
36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
42 ENGINEERING
420205 -- Engineering-- Transport & Storage Facilities-- (1980-)
423000 -- Engineering-- Marine Engineering-- (1980-)
ALLOYS
ANODES
ATLANTIC OCEAN
CATHODIC PROTECTION
COAL TAR
COATINGS
CORROSION PROTECTION
DESIGN
ELECTRODES
EPOXIDES
IRON ALLOYS
IRON BASE ALLOYS
NORTH SEA
OFFSHORE OPERATIONS
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
OTHER ORGANIC COMPOUNDS
PASSIVATION
PROTECTIVE COATINGS
SEAS
STEELS
SURFACE WATERS
SURVEILLANCE
TAR