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research-article

On the influence of the corrosion defect size in the welding bead, heat affected zone and base metal in pipeline failure pressure estimation: A Finite Element Analysis Study.

[+] Author and Article Information
Gerardo Terán

Departamento de Ingeniería Química Industrial, ESIQIE-IPN, UPALM, Edif. 7, Zacatenco, Mexico City, Mexico C.P. 07738
gerardoteranm@gmail.com

Selene Capula

Laboratorio de Microtecnología y Sistemas Embebidos, CIC-IPN, Av. Juan de Dios Batíz s/n, Col. Industrial Vallejo, Mexico City, Mexico C.P. 07738
selenecapula@gmail.com

Julio Velazquez

Departamento de Ingeniería Química Industrial, ESIQIE-IPN, UPALM, Edif. 7, Zacatenco, Mexico City, Mexico C.P. 07738
jcva8008@yahoo.com

Daniel Angeles

Instituto Tecnológico Superior de TANTOYUCA (ITSTA), Desv. Lindero Tametate s/n, Col. La Morita, Tantoyuca, Veracruz, Mexico, C.P. 92100
dangelesh0600@alumno.ipn.mx

Esther Santillan

Departamento de Ingeniería Química Industrial, ESIQIE-IPN, UPALM, Edif. 7, Zacatenco, Mexico City, Mexico C.P. 07738
esthersantillan@gmail.com

1Corresponding author.

ASME doi:10.1115/1.4042908 History: Received October 01, 2018; Revised February 11, 2019

Abstract

In this study, an experiment to estimate the failure pressure in a pipeline with localized corrosion in base metal (BM), heat affected zone (HAZ) and welding bead (WB) via finite element was carried out. In the gas pipeline industry, there are different methods (B31G, RESTRENGH, Shell, DNV, PCORR, and Fitnet FFS) or certain author (Choi and Cronin) to determine the failure pressure. However, one disadvantage of these methods is that their equations do not consider damage corrosion at the HAZ or WB. They only consider corrosion in the BM. Corrosion shape is rectangular with radios at the edges. In this study, the corrosion defect depth (d), corrosion defect length (L) and corrosion defect width (W) were varied. True stress-strain curves for BM, HAZ and WB of an API 5L X52 were introduced in the finite element (FE) program. The results show that the pressure decreases as the t, L and W increases. This is due to the damage corrosion being more severe as it grows which causes the failure pressure to decrease.

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