CORROSION PROTECTION OF CRUDE OIL STORAGE TANKS BOTTOMSINTERNAL SURFACE

摘要

Crude oil contains water and different soluble inorganic and organic compounds.rnDuring storage and transportation of crude oil, the aqueous solution sediment (ASS) containsrnhigh concentration of H2S, Cl-, SO42-, etc. The corrosion rate of tank bottoms can vary fromrn0.05 to 3.0 mm/year. The service life of tank bottoms is unpredictable and it can be in thernrange of 2 to 20 years. The traditional corrosion protection systems (cathodic protection,rncoatings, and inhibitors), in many cases, are not inefficient, have low service life, or theyrncannot be applied at all. Now available is a newly-created multistage corrosion protectionrnsystem, which combines different types of soluble corrosion inhibitors (SCI) and cathodicrnprotection system (CPS). The synergistic effect that allows the decrease of the concentrationrnof inhibitor by 3 to 6 times and the current density by 2 to 5 times has been achieved. Inrnaddition, special devices, which deliver inhibitors, are presented.