Stein Olsen Statoil Research Centre Trondheim
Olav Lunde Statoil Bergen
Arne Dugstad Institute for Energy Technology Kjeller, Norway
Iron from corrosion in the two 36-in. gas-condensate pipelines from the Troll field to shore caused problems in the glycol regeneration units as a result of iron precipitation.
Although the amount of iron represented no significant corrosion problem in the pipelines, the solution to the problem in the glycol-regeneration units was to reduce the corrosion rate by use of pH stabilization.
NaOH was injected to achieve a pH value of 7.4, which in turn reduced the iron content to 10 ppm, corresponding to a maximum corrosion rate o...