The Influence of Natural Gas Velocity on Hot Tapping Process
Eed A. Abdel-Hadi1, Sherif H. T.2, Ahmed S. K.3, A. A. Al-Shafai4
1Prof. Dr. Eed A. Abdel-Hadi, Mechanical Engineering, Shobra Faculty of Engineering, Benha University, Cairo, Egypt.
2Prof. Dr. Sherif Hady Taher, Mechanical Engineering, Shobra Faculty of Engineering, Benha University, Cairo, Egypt.
3Dr. Ahmed Mohamed Salah El-Said Kandil, Mechanical Engineering, Shobra Faculty of Engineering, Benha University, Cairo, Egypt.
4Eng. Ahmed Atef Al Shafai, Mechanical Engineering, Shobra Faculty of Engineering, Benha University, Cairo, Egypt.
Manuscript received on 10 December 2017 | Revised Manuscript received on 18 December 2017 | Manuscript Published on 30 December 2017 | PP: 31-38 | Volume-7 Issue-2, December 2017 | Retrieval Number: A5206107117/17©BEIESP
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© The Authors. Blue Eyes Intelligence Engineering and Sciences Publication (BEIESP). This is an open access article under the CC-BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/)
Abstract: The paper presents a numerical modeling of an arc welding as a heat source for the in-service natural gas pipeline at operating pressure 45 bar and 2 m/s velocity to allow predict peak temperature and cooling rate at specific points. Taking in to consideration all boundary conditions of fluid properties, ambient condition, and material specifications to achieve a sufficient model for the influence of natural gas velocity on the welding process to prevent the risk of hydrogen induced crack and burn through risk. Experiments were carried out on the national natural gas transmission pipeline in Egypt, during a hot tapping process for new branch execution, measurements and boundary conditions were recorded and then compared with numerical modeling analysis, furthermore, changing of natural gas velocity from 2 m/s to 20 m/s in numerical modeling were carried out to predict the risk of hydrogen induced crack and burn through; and to precise the safe range of gas velocity during hot tapping process.
Keywords: Hot-Tapping Process, Velocity Influence in-Service Welding, Natural Gas
Scope of the Article: Welding Technology