Investigation of corrosion penetration rate on alloy steel in petroleum industries for three samples of crude oil, northern Iraq

Abstract

In the field of oil, a crude oil is transported from the extraction site to the refinery, where it is stored in tanks, and then pumped to the refining towers for the purpose of starting the separation process. This paper is focused on the corrosion problem effect on the conveying media such as pipe or tanks made of alloy steel material. The current study includes using of three samples of crude oil from northern Iraq which the crude based on the region located in, Kirkuk, Makhmour, and Qayara. The corrosion effect on alloy steel material sample experiment is held by immersing the metal specimens in a crude oil at room temperature 25 [ o C]. The loss weight method to know the corrosion effect is used by weighting the alloy steel samples before and after immersing it in a crude oil through time. The CPR (corrosion penetration rate) had been calculated for the three samples, it’s clear that the Qayara and Makhmour crude oils had higher rates of corrosion of the alloy steel metal and the lowest is the Kirkuk crude oil. The Qayara Crude oil sample has higher penetration for the metal by approximately 70 [%] more than Kirkuk Sample. The weight loss percentage of Kirkuk and Makhmour crude oil samples were almost converging between (0.11%–0.15%) while it was 0.75% for the specimen effected by Qayara crude oil. A mechanical tensile test was taken before and after for the corrosion effect for the samples. The full mechanical test report is shown in the results for all the samples being checked and analyzed. The most noticeable is the reduction in yield, ultimate stresses as well as the elongation are maximum decreased by 1.2 [%], 0.65 [%] and 4 [%] respectively, because the variations in the chemical elements for each sample of the crude oil.