Stabilizing pH in Troll pipelines solves glycol-regen problems

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...

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