School of Infrastructure Process Engineering and Technology (SIPET)

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School of Infrastructure Process Engineering and Technology (SIPET)

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    COMPARATIVE ANALYSIS OF TRAFFIC PERFORMANCE OF SMALL AND LARGE CENTRAL ISLAND ROTARIES IN MINNA, NIGERIA
    (SAVAP International, 2013) Abubakar, Mahmud; Ndoke, P. N.
    Of recent, the government of Niger state has embarked on the construction of roundabouts with small central island rotaries; this paper compares the performance of large central island rotaries with small central island rotaries. The performance of large central island rotaries compares well to the performance of small central island rotaries. Capacities of rotaries with small islands were found to be higher than capacities of large central island rotaries while the delay for large central island rotaries was found to be higher than that of small central island rotaries. However, both large and small central island rotaries were found to be operating at the same level of service. This study provides recommendations to traffic engineers and/or planners on the conditions under which both central island rotaries perform better and, thus, should be considered.
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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.