A platform for research: civil engineering, architecture and urbanism
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Any system especially long pipelines, transporting fluids can experience unsteady flows resulting from moving from one steady state to another. This transient behaviour causes surge pressures in the system, that are experienced on both the inlet and outlet of the pump stations. The surge analysis will quantify these pressures and also surge suppression measures, which can be added to keep these surges pressures within acceptable limits. On the Phase 3 project of the Great Man Made River Project in Lybia, the sizing of the surge vessel has been carried out in accordance with these sizing criteria. Three sets of operational surge vessels were designed as follows: 34 off 250 m3, on the outlet of the Al Gardabiya Pump Station; 18 off 250 m3, on the inlet of the Assdada Pump Station and 8 off 250 m3, on the outlet of the Assdada Pump Station. The use of air mass calculation, rather than simple water level controls, for surge suppression air vessels on water pump stations, can reduce the size requirement by up to 28 %. On large installations the cost of the surge vessels can be significant. The algorithm implemented reduces the operation of the air compressors and utilises a narrow mass control band. The mass control compensates for the operating pressures and temperature and controls the air compressors. An air release valve is also included, to remove excess air and keep the air within the required operating band. The simple surge vessel is still suitable for small capacity installation (< 100 m3) as the extra cost of the instrumentation and PLC outweights by the extra size of the surge vessel.
Any system especially long pipelines, transporting fluids can experience unsteady flows resulting from moving from one steady state to another. This transient behaviour causes surge pressures in the system, that are experienced on both the inlet and outlet of the pump stations. The surge analysis will quantify these pressures and also surge suppression measures, which can be added to keep these surges pressures within acceptable limits. On the Phase 3 project of the Great Man Made River Project in Lybia, the sizing of the surge vessel has been carried out in accordance with these sizing criteria. Three sets of operational surge vessels were designed as follows: 34 off 250 m3, on the outlet of the Al Gardabiya Pump Station; 18 off 250 m3, on the inlet of the Assdada Pump Station and 8 off 250 m3, on the outlet of the Assdada Pump Station. The use of air mass calculation, rather than simple water level controls, for surge suppression air vessels on water pump stations, can reduce the size requirement by up to 28 %. On large installations the cost of the surge vessels can be significant. The algorithm implemented reduces the operation of the air compressors and utilises a narrow mass control band. The mass control compensates for the operating pressures and temperature and controls the air compressors. An air release valve is also included, to remove excess air and keep the air within the required operating band. The simple surge vessel is still suitable for small capacity installation (< 100 m3) as the extra cost of the instrumentation and PLC outweights by the extra size of the surge vessel.
Mass control for surge vessels
Yeats, A. (author)
2002
16 Seiten, 13 Bilder, 1 Quelle
Conference paper
English
Mass control for surge vessels
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