Effects of blended hydrogen enriched natural gas on the microstructure and mechanical properties of a X42 steel pipeline and Grade 290 weld
department or school: Applied Science, Faculty of
department or school: Engineering, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Piche, Austin
issued: 2020-12-14T22:08:33Z
issued: 2020
related degree: Master of Applied Science - MASc
degree grantor: University of British Columbia
description: The objective of this thesis was to investigate the effects of hydrogen-enriched natural gas (HENG) blend on the microstructure and mechanical properties of an API 5L X42 pipeline that is currently being used in FortisBC’s infrastructure. The seam welded X42 pipeline is a commonly used material in North America’s natural gas infrastructure and is manufactured through hot rolling and connected with submerged arc welding (SAW) along the seam. A decommissioned Vintage Grade 290 pipe was manufactured in the same way as the X42 material which was also used for this study. The introduction of hydrogen gas into other X-series pipeline systems has shown the potential to cause hydrogen embrittlement (HE) which can lead to premature failure. This embrittlement could degrade the mechanical properties and be one of the main reasons for a shortened life cycle, causing repairs to occur more frequently. In this study, the ultimate tensile strength, yield strength, percent elongation, area reduction, fracture surface, microhardness, and phase compositions were all tested on both the X42 base and Vintage Grade 290 welded material. These properties were obtained through tensile tests, Vickers hardness testing, and analysis on a scanning electron microscope. Tensile test samples were obtained in the longitudinal direction in the pipe wall with the welded samples in the hoop direction perpendicular across the weld. These samples were induced in various hydrogen and natural gas blends for different prolonged periods. Induction blends consisted of 0%, 5%, and 20% hydrogen concentration by molar mass mixed with natural gas. The samples were then held in these enriched environments for periods of 2 weeks, 2 months, and 6 months. The results revealed that both the hydrogen concentration and time of exposure have small impacts on various properties of the material in the X42 base material. As for the Grade 290 weld, the hydrogen concentration and exposure time did not impact the mechanical p…
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/76796
note: EFFECTS OF BLENDED HYDROGEN ENRICHED NATURAL GAS ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A X42 STEEL PIPELINE AND GRADE 290 WELD by Austin Piche B.A.Sc., The University of British Columbia, 2020 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF APPLIED SCIENCE in THE COLLEGE OF GRADUATE STUDIES (Mechanical Engineering) THE UNIVERSITY OF BRITISH COLMUBIA (Okanagan) December 2020 © Austin Piche, 2020 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis/dissertation entitled: EFFECTS OF BLENDED HYDROGEN ENRICHED NATURAL GAS ON THE MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A X42 STEEL PIPELINE AND GRADE 290 WELD submitted by Austin Piche in partial fulfillment of the requirements of the degree of Master of Applied Science. Examining Committee: Dr. Dimitry Sediako, School of Engineering, Mechanical Engineering ______________________________________________________________________________ Supervisor Dr. Lukas Bichler, School of Engineering, Mechanical Engineering ______________________________________________________________________________ Supervisory Committee Member Dr. Jian Liu, School of Engineering, Mechanical Engineering ______________________________________________________________________________ Supervisory Committee Member Dr. Ahmad Rteil ______________________________________________________________________________ University Examiner iii Abstract The objective of this thesis was to investigate the effects of hydrogen-enriched natural gas (HENG) blend on the microstructure and mechanical properties of an API 5L X42 pipeline that is currently being used in FortisBC’s infrastructure. The seam welded X42 pipeline is a commonly used material in North America’s natural gas infrastructure and is manufactured through hot rolling and connected with submerged arc welding (SAW) along the seam. A decommissioned Vintage Grade 290 pipe was man…
has type: Thesis/Dissertation
date issued: 2021-02
is shown at: 10.14288/1.0395286
language: eng
degree discipline: Mechanical Engineering
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
type: Text
identifier URI: http://hdl.handle.net/2429/76796