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    Hydraulic Transient Analysis in Fluid Pipeline: A Review
    (JOURNAL OF SCIENCE TECHNOLOGY AND EDUCATION , ATBU, BAUCHI, 2019-12-19) Muhammad, .A. B.; Nasir, .A.; Ayo, .S. A.; Bori Ige
    Hydraulic transient is an important phenomenon in the pipeline transportation system that have adverse and catastrophic effects on the most susceptible pipeline components such as valve, pumps, pipes as well as the environment. The major causes of hydraulic transients are sudden or abrupt valve closure or pump failures as a result of power outage. The major challenges of transient analysis techniques are to optimally achieve a balance between accuracy of results obtained from the analysis and simplicity of the adopted techniques in analyzing both complex and simple pipeline networks. In order to attain this fit many researchers have proposed, developed and used different models and algorithms to this regards. This paper surveys various transient analysis techniques, model and algorithm for protection of pipeline network system with a view of achieving optimal trade-off between transient analysis techniques used and the type of fluid flow pipeline analyzed. Performance and limitations of some of the previous works are identified. Finally, future investigations on petroleum and its products were recommended.
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    Hydraulic Transient Analysis of a Petroleum Pipeline Transporting Dual Purpose Kerosene Using Modelling and Simulation Approach
    (Premier Journal of Engineering and Applied Sciences, 2020-04-21) Muhammad, .A. B.; Nasir, .A.; Ayo, .S. A.; Bori Ige
    Hydraulic transient analysis of a pipeline transporting dual purpose kerosene (DPK) was carried out in this research using simulation approach. Many petroleum pump stations and pipelines experience leakages and failures at their nodes due to changes in flow parameters that lead to hydraulic transient. Such types of unsteady situations are encountered frequently in pipelines where the valves are suddenly closed. WANDA Transient 4.5.1210 commercial software was used for the analysis of hydraulic transient. Variation in pressures and discharges with respect to time after the closure of a gate valve at the downstream of a pipeline were observed. It was observed in the study that pressure at node F rise significantly up to about 1354 kPa against the initial inlet pressure of 120 kPa due to the instantaneous valve closure and it was also observed that pressure at node B drops to a negative pressure of -101 kPa and hence the formation of cavitations at that node B and pipe P2. The analysis showed that the magnitude of the pressure surge decreases as the valve closure is increased. The research recommended that surge tanks should be installed at node F to stabilize the pressure surge and also air vessels are to be installed at nodes B to curtail damages due to cavitations.
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    Investigation of the Effects of Hydraulic Transient due to Instantaneous Valve Closure in a Petroleum Pipeline
    (NIPES Journal of Science and Technology Research, 2020-06-01) Muhammad, .A. B.; Nasir, .A.; Ayo, .S. A.; Bori Ige
    Pressure surge analysis of petroleum pipeline transporting automotive gas oil (AGO) also known as Diesel oil was carried out in this research work. Pressure transient analysis is often more significant than the steady state analysis that engineers usually use in pipeline design. Pressure transient analysis helps to understand the additional pressures the pipeline can be subjected to as a result of instantaneous rapid valve closures or pump failure. The fluid pressure and flow rate in the pipeline system may change significantly at some intervals of time due to the valve closure and such types of unsteady situations are encountered more often in pipelines where the valves are suddenly closed. In this paper, pressure surge due to instantaneous valve closure in a petroleum pipeline conveying AGO was studied in a virtual environment. WANDA Transient 4.5.1210 commercial software was used for the analysis of the pressure surge in the pipeline due to instantaneous valve closure time of 4.75s. It was observed in the study that pressure at some nodes rise significantly up to about 1400 kPa against the initial inlet pressure of 120 kPa due to the instantaneous valve closure and it drastically drops at some nodes to negative pressure of about -100 kPa and hence the formation of cavitations. The analysis showed that the magnitude of the pressure surge decreases as the valve closure is increased.
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    An evaluation of mechanical properties and estimation of environmental reduction factors in welded API X70 steel pipeline in natural seawater
    (Taylor & Francis Ltd, 2023-06-20) Oyewole, Adedipe; Adulrahman, Bala Gambo; Joseph, Babalola Agboola; Kafayat Toyin, Obanimomo; Asipita, Salawu Abdulrahman
    Due to the detrimental effect of damage induced by seawater in pipeline structures, there is a need to investigate the effects of natural seawater and air environments on mechanical properties of representative pipeline materials, to obtain useful data for estimation of their service lives. Hence, in this work, a X70 steel pipeline plate was welded using submerged arc welding technique; and subjected to air and natural seawater environments. Test specimens were soaked in seawater for twelve months at 28 °C. The parent plates, weld regions and the heat affected zones were investigated by evaluating their mechanical properties and fracture surfaces. The experimental findings revealed that the tensile strengths of parent and weld were 634.00 MPa and 674.00 MPa respectively, while the compressive stresses were 750.10 MPa and 750.40 MPa respectively with highest hardness value of 239HV. The findings also revealed that weld area and heat affected zone depend on material thickness, heat input and possible effect of residual stresses in the weldment. The fracture surfaces of test specimens showed combination of brittle and ductile failure mechanisms. Comparison of the test results revealed that seawater had significant effect on the mechanical properties and surface morphology of the API X70 steel pipeline with respect to immersion time.