Corrosion protection for offshore hot risers

Journal Article · Mon Aug 01 04:00:00 EDT 1983 · Oil Gas J.; (United States)

OSTI ID:5291850

Nilsen, N; Espelid, B; Hansen, R K

The prevention of external splashzone corrosion on hot risers has required application of special protection techniques. A number of improperly protected hot risers have suffered an unexpected high corrosion rate during initial operations in the North Sea. One incident led to a riser rupture, fire, and loss of lives. On a hot riser, heat fluxes and increased external steel surface temperature may increase the corrosion rate by a factor of ten compared to the corrosion rate on unheated steel. Especially in the tidal and splash zone, failures in the protection systems will give severe consequences. Based on Veritas' overall objective to work for the improvement of safety of life, environment, and property, it was proposed to study-under controlled field conditions-the external corrosion and cathodic protection of hot risers in the sea. A group-sponsored project was therefore planned with these objectives: To examine the external corrosion behavior, coating performance, and cathodic protection demand on hot risers exposed to natural seawater. To examine the heat flux and external temperature behavior of coatings and bare metal under the same exposure conditions.

• Research Organization: Det norske Veritas Bergen
• OSTI ID: 5291850
• Journal Information: Oil Gas J.; (United States), Journal Name: Oil Gas J.; (United States) Vol. 81:31; ISSN OIGJA
• Country of Publication: United States
• Language: English

Related Subjects

02 PETROLEUM
020300* -- Petroleum-- Drilling & Production
ALLOYS
ATLANTIC OCEAN
CATHODIC PROTECTION
CHEMICAL REACTIONS
COATINGS
CORROSION
CORROSION PROTECTION
CORROSIVE EFFECTS
GEOLOGIC DEPOSITS
HEAT FLUX
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MARINE RISERS
MINERAL RESOURCES
NORTH SEA
OIL FIELDS
OXYGEN COMPOUNDS
PETROLEUM DEPOSITS
PIPES
PROTECTIVE COATINGS
RESOURCES
SEAS
SEAWATER
STEELS
SURFACE WATERS
WATER