TY - JOUR
T1 - Analysis of the remaining life of API 5L grade B gas pipeline in the flare gas recovery unit
AU - Sholihin, M. Y.M.
AU - Kusyanto, H. S.
AU - Soegijono, Bambang
N1 - Publisher Copyright:
© Published under licence by IOP Publishing Ltd.
PY - 2018/11/19
Y1 - 2018/11/19
N2 - Carbon steel pipe material API 5L grade B is commonly used for distribution in oil and gas industry. Internal corrosion is one of the biggest corrosion problems in carbon steel material that could impact production and cause economic losses. In this work, corrosion rate, remaining life, fluid composition, and corroded sample of API 5L grade B are analysed and calculated by development of microstructure, mechanical denaturing, and change of chemical composition by comparing with new pipe sample. The results show that the thickness of the pipe API 5L grade B applied as distribution line significantly decreased from 8.4 mm to 7.1 mm in only one year with a high corrosion rate of 1.32 mm/year based on ultrasonic testing inspection during the years of 2000 - 2016. It was found that the deterioration of pipe material was caused by gas composition contain mostly gas hydrocarbon with CO2 10.1% mole and water composition containing 57.3 mg/L Cl- ion. This chemical composition decreased the pH of liquid to 4.5, creating a good corrosion environment for this pipe. It caused the active corrosion rate significantly increase in just one year. Based on calculations, the remaining life of this pipe line was found to be just 3.6 years because of internal corrosion. XRF, XRD, and SEM analyses were done to determine the composition of the corrosion product. Based on those analysis, the main causes of the corrosion are found to be CO2 and O2. It is concluded that, the mechanical properties of this corroded pipeline still satisfy the standard for API 5L grade B with a tensile strength of 441 MPa and hardness of 74.
AB - Carbon steel pipe material API 5L grade B is commonly used for distribution in oil and gas industry. Internal corrosion is one of the biggest corrosion problems in carbon steel material that could impact production and cause economic losses. In this work, corrosion rate, remaining life, fluid composition, and corroded sample of API 5L grade B are analysed and calculated by development of microstructure, mechanical denaturing, and change of chemical composition by comparing with new pipe sample. The results show that the thickness of the pipe API 5L grade B applied as distribution line significantly decreased from 8.4 mm to 7.1 mm in only one year with a high corrosion rate of 1.32 mm/year based on ultrasonic testing inspection during the years of 2000 - 2016. It was found that the deterioration of pipe material was caused by gas composition contain mostly gas hydrocarbon with CO2 10.1% mole and water composition containing 57.3 mg/L Cl- ion. This chemical composition decreased the pH of liquid to 4.5, creating a good corrosion environment for this pipe. It caused the active corrosion rate significantly increase in just one year. Based on calculations, the remaining life of this pipe line was found to be just 3.6 years because of internal corrosion. XRF, XRD, and SEM analyses were done to determine the composition of the corrosion product. Based on those analysis, the main causes of the corrosion are found to be CO2 and O2. It is concluded that, the mechanical properties of this corroded pipeline still satisfy the standard for API 5L grade B with a tensile strength of 441 MPa and hardness of 74.
UR - http://www.scopus.com/inward/record.url?scp=85057832069&partnerID=8YFLogxK
U2 - 10.1088/1757-899X/432/1/012016
DO - 10.1088/1757-899X/432/1/012016
M3 - Conference article
AN - SCOPUS:85057832069
SN - 1757-8981
VL - 432
JO - IOP Conference Series: Materials Science and Engineering
JF - IOP Conference Series: Materials Science and Engineering
IS - 1
M1 - 012016
T2 - 1st Materials Research Society-Indonesia Conference and Congress 2017, MRS-INA C and C 2017
Y2 - 8 October 2017 through 12 October 2017
ER -