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02484 LABORATORY INVESTIGATION OF NAPHTHENIC ACID CORROSION UNDER FLOWING CONDITIONS

Picture for 02484 LABORATORY INVESTIGATION OF NAPHTHENIC...
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Product Number: 51300-02484-SG
ISBN: 02484 2002 CP
Author: Nicholas R. Smart, Andrew P. Rance, and Andrew M. Pritchard
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Processing crude oils with high naphthenic acid contents can cause rapid corrosion of carbon steels in the temperature range 250-400°C, under high flow rate conditions. The corrosion rate is not readily predictable on the basis of chemical analysis of the crudes, although it is well known that the relative naphthenic acid and sulfur concentrations are important parameters. In predicting corrosivity, it is therefore important to measure the corrosion behaviour under controlled flowing conditions in environments that simulate as closely as possible those expected in an oil refinery. A refreshed, pressurised rotating cylinder apparatus has been used to measure the corrosion rates of mild steel specimens in a crude oil, using the weight loss method. This paper presents the results of some measurements that were carried out to examine the repeatability of the test technique and to investigate the effect of exposure time on the rate of corrosion. The tests were carried out in Harding crude oil at 340°C using a rotation speed of 1200 rpm, which corresponds to a pipe velocity of approximately 6 metres per second. The results demonstrate that good repeatability can be obtained for measurements in crude oil. The effect of exposure period on the corrosion rate is discussed and the composition of the surface films is described. Application of the test methodology to assessing the corrosivity of crude oils and fractions is outlined.
Processing crude oils with high naphthenic acid contents can cause rapid corrosion of carbon steels in the temperature range 250-400°C, under high flow rate conditions. The corrosion rate is not readily predictable on the basis of chemical analysis of the crudes, although it is well known that the relative naphthenic acid and sulfur concentrations are important parameters. In predicting corrosivity, it is therefore important to measure the corrosion behaviour under controlled flowing conditions in environments that simulate as closely as possible those expected in an oil refinery. A refreshed, pressurised rotating cylinder apparatus has been used to measure the corrosion rates of mild steel specimens in a crude oil, using the weight loss method. This paper presents the results of some measurements that were carried out to examine the repeatability of the test technique and to investigate the effect of exposure time on the rate of corrosion. The tests were carried out in Harding crude oil at 340°C using a rotation speed of 1200 rpm, which corresponds to a pipe velocity of approximately 6 metres per second. The results demonstrate that good repeatability can be obtained for measurements in crude oil. The effect of exposure period on the corrosion rate is discussed and the composition of the surface films is described. Application of the test methodology to assessing the corrosivity of crude oils and fractions is outlined.
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