Study On The Analysis Of Full-featured Pump Curve And The Impact Of Water Hammer Calculation’s Accuracy

Water is indispensable to the survival of humans and all living things, and industrial andagricultural production, economic development and environmental improvement of preciousnatural resources. Our fresh water resources in time and space distribution is extremelyuneven, in order to solve this problem, need to cross-regional, inter-basin long distance waterdiversion instead of fetching water from a nearby, namely, to establish the long distance waterconveyance project.In recent years, the long distance water conveyance project of detonation tube frequentlyhappens, stop the pump water hammer is the important cause of broken tube. Therefore, tostop pumping water hammer calculation and protection is more and more arouse people’sattention. Based on the two long and large diameter engineering example, in the pump waterhammer calculation, on the basis of relevant theories, written in c++computer program tostop pumping water hammer calculation, analysis and study the application method of pumpcharacteristic curve of all as well as the impact of water hammer calculation accuracy.Pump characteristic curve is completely stopped pumping water hammer calculationbasis. In practical engineering, the water pump water exist in the process of friction andhydraulic impact, head loss and the influence of measurement error, and many other factors,the actual measurement of the water pump characteristic curve will produce certain error.Based on specific speed NS=80and NS=127water pump characteristic curve, for example,all of its numerical value innovation, respectively for WH(x) and WM(x) the theoretical value,maximum value, minimum value, three sets of discrete data of the three sets of discrete dataerror analysis, concluded that maximum error range.A long-distance water delivery projects, in shaanxi YanChuan xinjiang long distancewater conveyance project of the two actual engineering as the example, will pumpcharacteristic curve to carry on the numerical value transformation, using the modified WH,WM the theoretical value, maximum value, minimum value to stop pump water hammercalculation three sets of discrete data. The supreme head of the envelope is calculated and theminimum head envelope analysis, concluded that the error of the water pump characteristiccurve all had a great influence on the highest water head envelope, pressure difference between the top up to more than400meters; Has no effect on envelope is almost the lowesthead.In many practical projects, often diverse terrain, complex pipeline system, water pumpcharacteristic curve of error will be full of very large impact on the water hammer calculationaccuracy. Therefore, in order to avoid this kind of influence, should try to use the water pumpcharacteristic curve of the theoretical value all to stop pumping water hammer calculation, toensure the safe operation of long distance water conveyance project.