Modification of Erosion-Corrosion Testing Equipment and Study of the Effect of Temperature on the Erosion Corrosion Rate of API 5CT L80 Steel in CO2 and Acetic Acid Environment

• Main Author: Valentino Bimo Prako, Anthonius
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/41621
• Institution: Institut Teknologi Bandung

Impurities in the form of dissolved CO2 in water in the petroleum extraction process can cause corrosion in steel pipes. The reaction between carbonic acid and steel can form corrosion product in the form of FeCO3 which will reduce the corrosion rate. One factor that will affect the morphology and nature of corrosion products is the environmental temperature and its interaction with other environmental factors such as pH, CO2 partial pressure and flow velocity. Therefore, corrosion testing is needed to determine the effect of temperature on the corrosion rate of API 5CT L80 steel. Corrosion testing is carried out with a modified autoclave to allow for fluid flow or known as erosion-corrosion. Testing environment parameters includes system pressure with 2 bar of saturated CO2, 3360 ppm acetic acid and four variations of the test temperature at 40 ?, 60 ?, 80 ? and 95 ?. ?. The rate of erosion-corrosion of API 5CT L80 steel in a saturated CO2 environment at a temperature of 60 ? increased by 0,6 times compared to testing at a temperature of 40 ?. An increase in temperature from 60 ? to 80 ? causes a decrease in corrosion rate of 0,2 times due to the formation of protective FeCO3 layers. The highest corrosion rate occurs at a test temperature of 95 ?. The high corrosion rate at a temperature of 95 ? is caused by damage to the FeCO3 layer which caused by mesa attack.