Shijiazhuang-school Pump Co., pump control cabinet repair and maintenance 1) Disconnect the main power control cabinet, check the switch, NSQ45-15-5.5 pumping sand pump, start, stop button action should be flexible and reliable. 2) Check the inside air switches, contactors, relays and other electrical appliances are in good condition, fastening thread the electrical contacts and terminals of terminal screws. 3) Clean the inside and outside the control cabinet free of dust. 4, NPSH NPSH NPSH, also known as net positive suction head, is a major parameter cavitation performance. NPSH There have been represented by Δh. 5, the power and efficiency of the pump power usually refers to the input power, that is the prime mover shaft power on the mass support, it is also known as an axis of power, pumping sand pump, with P said; pumps, also known as the effective power output, with Pe represents. It is an effective energy delivery from the pump unit time pump out the liquid obtained. Effective energy because the pump head means the effective energy output per unit weight of the liquid obtained from the pump, so that the head and the mass flow rate and the acceleration of gravity, is the output of liquid per unit time obtained from the pump - the pump The effective power: Pe = ρgQH (W) = γQH (W) where ρ-- pumped liquid density (kg / m3); γ-- pumping liquids with severe (N / m3); Q-- pump flow (m3 / s); H-- pump head (m); g-- gravitational acceleration (m / s2). Differential shaft power P and the effective power Pe of the loss of power to the pump, the size of the metering pump efficiency. Efficiency of the pump power and shaft power for the effective ratio, with η represents. Pumping sand pump NSQ50-10-5.5 pumping sand pump _ pumping sand pump model (quality businessmen) are provided by Shijiazhuang-Pump Co., Ltd. faction. Shijiazhuang-school Pump Co., Ltd. (www.shipaipump.com) is specialized in "slurry pumps, submersible pumps, sewage pumps, chemical pump, pulp pump, water pump, mud pump, multi-stage" of the enterprise, the company of " honesty, hard service "concept, to provide you with the highest quality products and services. Welcome to inquire! Contact: Manager Xu.