ASTM G205-10 "Standard Guide for Determining Corrosivity of Crude Oils" was developed to assess the bulk crude -properties within a transmission pipeline for their propensity towards internal corrosion. The guide considers three main properties in its assessment of potential crude corrosivity. (1) The emulsion inversion point (EIP): the EIP test evaluates the water cut required to change the oil/water mixture from a water-in-oil emulsion to an oil-in-water emulsion. This transition causes water to be present as the external phase of the emulsion, which is associated with higher rates of general corrosion. (2) Oil vs. Water Wettability (wettability, or WA): for corrosion to proceed, the pipeline wall must first be wetted by water. The wettability test evaluates the susceptibility of an oil wetted steel electrode to become water-wet in the presence of water. (3) Effect of crude oil on the corrosivity of brine (corrosivity). This test evaluates the corrosivity of a reference brine that has been contacted by crude oil. The effect of an oil on brine can be corrosion inhibitory, neutral, or corrosion accelerating. This test can provide an indication of the corrosivity of water found in a crude pipeline system. This paper compares results of testing from a cross section of transmission line crude samples and discusses procedure development for the ASTM G205 standard guide. The intent is to offer improvements to the ASTM standard guide, while gaining a better understanding of the differences in potential corrosivity based on crude characteristics.
ASTM G205-10 Crude Corrosivity Testing for Crude Transmission Pipelines
2012
10 Seiten, 6 Bilder, 2 Tabellen, 14 Quellen
Conference paper
English
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