How to solve high lift pump operation problems

Plain Lakes axial - usually outside the flood, waterlogging to run, although the design of some of the pumping station on the run in some adverse conditions conducted verification, but due to the impact of changes in the water environment, along the river and lake riverbed silt yearly high, pumping stations inside and outside the water level amplitude is large, especially in the outer river floods during high water levels, constant pressure water supply equipment, use of lift beyond its design, pumping stations were forced to shut down, or even damaged. Solve the above problem, according to the actual situation of the chestnut Scissor lift, measures were taken.
(A) adjusting the blade installation angle Currently, domestic axial diameter of 300 mm or more, the blade angle can be adjusted. Adjusting the blade installation angle to some extent, the expansion of the use of the pump, when the pump head increases, the blade mounting angle can be reduced, appropriate to reduce the amount of water to meet the pump in case of normal operation of the high lift requirements.
At present, the domestic large quantities, widely distributed, diameter of 1 m below the small axial stations (generally by the township administration), because technology is weak, with angle adjustment laborious (half-tone). Therefore, the pumping station has been put into operation, the few changes depending on the operating conditions of the normal operating range of the pump are reviewed and adjusted, resulting in waste of energy, pumping stations can not play normal benefits. It is therefore recommended to strengthen technical guidance, especially for those who use improper lift pumping more than the normal range of use, should be based on the new operating conditions, the pump carefully review the working conditions, the corresponding technical measures. According to the economic and effective use of the principles, generally only when the angle adjusting operation can not meet the new requirements, before considering other technologies (valves, pumps) rehabilitation programs.
????(2) If the blade angle for the pump to the minimum still can not meet the requirements of high-lift, long-running, you can consider replacing a high lift pumps, such as the number of revolutions lower than the guide vane axial or mixed flow pumps.
Replace the water pump is usually a relatively easy way, but for medium-sized diesel pump, to consider the units supporting and runner matching and other factors, so a larger project investment, the unit cost of equipment is high. In addition, at the same flow rate, due to the high lift pump, pump cavitation and hydraulic vibration increased possibility, especially with the inlet and outlet conduit between the hydraulic pump with the problems often become the principal contradiction changed. Therefore, on the basis of the original pump hydraulic pump used for high-lift solutions to the problem, not only the higher cost, but technically more complex, and thus generally apply only to small axial flow pump station. In addition, not only to consider changing the pump when pumping at maximum lift can safely run, but also it should be possible to make Li stations in operation for many years, the average efficiency is higher, for maximum lift and a big gap in the average lift pumping station should be fully Consider this.