Hot Risers in the North Sea: a parametric study of CP and corrosion characteristics of hot steel in cold seawater

Conference · Sun May 01 04:00:00 EDT 1983 · Offshore Technol. Conf.; (United States)

OSTI ID:5437006

Fischer, K P; Hansen, A H; Mehdizadeh, P; Solheim, P S

In recent years doubts have been expressed regarding the adequacy of the design criteria for cathodic protection of hot oil risers in the North Sea area. Therefore it was decided to study some of the fundamental aspects of corrosion and corrosion control of hot steel in cold seawater. For studying these phenomena a specially designed channel flow system was constructed. Seawater was pumped into the laboratory facilities and through the flow channel. Here the flow rate, the steel surface temperature and the polarisation characteristics of the mounted steel probes could be controlled. The progressive current density at potentiostatic polarisation was found to be a sensitive function of the development of the calcareous deposit on hot steel. Thus on hot steel in cold seawater the initial current density will be very high. Subsequently, due to the build up of the calcareous deposit, the current will decrease to a value in the range as found for steel in seawater at ambient temperature. The acquired data on the cathodic polarisation behaviour of hot steel in cold seawater should be applicable for the designers of protection systems of marine risers.

• Research Organization: The Ship Research Institute of Norway
• OSTI ID: 5437006
• Report Number(s): CONF-830514-
• Conference Information: Journal Name: Offshore Technol. Conf.; (United States) Journal Volume: 2
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105 -- Metals & Alloys-- Corrosion & Erosion
42 ENGINEERING
423000* -- Engineering-- Marine Engineering-- (1980-)
ALLOYS
ATLANTIC OCEAN
CATHODIC PROTECTION
CHEMICAL REACTIONS
CORROSION
CORROSION PROTECTION
CORROSIVE EFFECTS
DESIGN
FABRICATION
HOT WORKING
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MARINE RISERS
MATERIALS WORKING
NORTH SEA
OFFSHORE PLATFORMS
OXYGEN COMPOUNDS
PIPES
SEAS
SEAWATER
STEELS
SURFACE WATERS
WATER