51316-7519-A Study of the Flow Effect on Naphthenic Acid Corrosion of Mild Steel

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Product Number: 51316-7519-SG

ISBN: 7519 2016 CP

Author: Nicolas Jauseau

Publication Date: 2016

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Naphthenic acid corrosion in oil refineries has been observed since the beginning of 20th century (ref). Due to their relatively lower prices crude oils containing naphthenic acids (NAP) became more attractive for the refining industry in spite of the corrosiveness issues raised by processing such crude oils. Corrosive attack of NAP and sulfur compounds which inherently are present in crude oils occurs mainly in locations such as furnace tubes atmospheric and vacuum distillation towers side stream piping and bends of transfer lines. In transfer lines the combined effect of high velocity (up to 90 m/s) and multiphase flow enhances the NAP corrosive effects on metal surfaces.This study focuses on the combined effect of high flow velocities and multiphase flow on naphthenic acid and sulfidation corrosion on mild steel under high temperatures similar to real conditions encountered in the transfer lines. The experiments were carried out on a small scale loop (1/4” tubing). The small scale tests investigated the determination of flow patterns and their hydrodynamic characteristics under high temperature conditions (340°C) and used NAP containing oils. The small scale test section consisted of mild steel tubing samples with different geometrical shapes such as straight pipe elbows in order to mimic the bends in transfer lines. Corrosion rates were assessed by using the weight loss method.Keywords:naphthenic acid corrosion sulfidation corrosion flow loop flow velocity multiphase flow oil refineries transfer lines.