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Pump and pumping stations.ppt

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Pump and pumping stations.ppt
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Pump and pumping stations,Project design,1,the function of pumps:,Pumping machinery serve the following purposes in water systems: Lifting water from its source. Boosting water from low-service to high-service areas Draining storm water Transporting sludge or wastewater,Types of pumps:,Centrifugal pumps ,propeller pumps, mixed -flow Open –impeller, closed-impellersingle-stage multistage pumps (displacement pump ;rotary pumps; hydraulic rams; jet pumps; air lifts),How to choose pumping units,System heads Pump characteristic Required flow High efficiency Hydraulic characteristics Safety against cavitations Be convenient to manage Low cost Pumps be used widely in the market,Energy saving and regulating pumps,Is adverse to pumps’curve Output flow in accordance with fluctuations in demand Head Different pumps national standards.for centrifugal pumping efficiency but for Propeller and diagonal pumps. The relationship between Qmin ,Qmax with only a pump , a few of pumps ,,Pumps with large capacity and low capacity working together will be more efficiency. Exchange impeller is suit for 1.primary run 2.The level of water change largely (over a wide static head range, abstraction engineering),The choice of regulating pump (1) out flow system (2) the number of pumps (3)rate of regulating,Inlet and flow course,A small pump station Absorbing well (be of medium size) Large impeller ,diagonal pumping stations 前池 forebay (d600mm)吸水池或流道。进水流道 flow passage(大中型,泵通过流道从吸水井中吸水) Protect against vortex and eddy(漩涡,逆流) let flow be stable,Critical depth and ABCDF whirl Quantity of air effects the work of PumpsThe inlet velocity influence formation of vortex,Lay out of pumping stations,Variety of collocation pressure pipe and inlet etc,
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