The pumps type 250-BQV are used to handle both clean and turbid water without big solids in conditions of light and middle-severe duties. Maximum temperature of pumped liquid is up to 60°C. These pumps are suitable for irrigation, water pumping-off on water construction works, on water reservoirs, pumping-off during floods, etc. As these pumps are intended for relatively big flow capacities it is necessary not to exceed NPSH during their operation. An exceeding of NPSH causes lower capacity of the pump or its break-down because of cavitation effect. We recommend to use hand-wing pump for flooding the pump. In the case of bigger and longer suction lines we recommend to use for flooding vacuum pump driven with electric motor.