MICROSTRUCTURAL ANALYSIS OF A STEEL PIPELINE MATERIAL UNDER THE IMPACT OF HYDROSTATIC PRESSURE TESTING

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Published: 2019-07-23

Page: 78-87


A. S. ADJOGBE

Project and Program Division, Niger Delta Development Commission, Port Harcourt, Rivers State, Nigeria.

C. A. OKORONKWO *

Department of Mechanical Engineering, Federal University of Technology, Owerri, Imo State, Nigeria.

J. O. IGBOKWE

Department of Mechanical Engineering, Federal University of Technology, Owerri, Imo State, Nigeria.

O. B. EZURIKE

Department of Mechatronics Engineering, Alex Ekwueme Federal University, Ndufu-Alike, Ikwo, Ebonyi State, Nigeria.

O. N. OGUOMA

Department of Mechanical Engineering, Federal University of Technology, Owerri, Imo State, Nigeria.

*Author to whom correspondence should be addressed.


Abstract

This study investigated the effect of hydrostatic test procedure on the micro structure of a steel pipe material and its effect on the mechanical properties of the materials due to the distortion of the microstructure of the steel material. Thus, the study aims to establish whether there is any significant change in these properties of the steel pipeline after the procedure. In The study, two pipeline spools of 76.2 mm (3-inch) and 101 mm (4-inch) were subjected to pre-determined maximum allowable operating pressures and designed hydrostatic pressures at designated data points. Thereafter, the spools were cut and the samples prepared for experimental tests and analysis. Series of test were carried out and the results obtained showed that there is significant change in the grain size (by 22.6% for the 3-inch and 17.5% for 4-inch pipes) and grain arrangement for the tested specimen with pronounced changes observed in the tensile strength, fatigue strength, hardness and microstructure of the hydrostatically tested specimens.

Keywords: Hydrostatic pressure, microstructure, grain size, strain hardening, steel pipeline, tensile strength


How to Cite

ADJOGBE, A. S., OKORONKWO, C. A., IGBOKWE, J. O., EZURIKE, O. B., & OGUOMA, O. N. (2019). MICROSTRUCTURAL ANALYSIS OF A STEEL PIPELINE MATERIAL UNDER THE IMPACT OF HYDROSTATIC PRESSURE TESTING. Journal of Applied Physical Science International, 11(2), 78–87. Retrieved from https://ikprress.org/index.php/JAPSI/article/view/4634

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