Pump head and conveying distance relationship: pump head calculation formula

Pump head is the height of water out, that is, the vertical height of the water to the outlet, with rice as a unit. Water will be subject to frictional resistance as it passes through the water line and piping attachments, losing some of the lift (referred to as the lost lift). Therefore, the total head of the pump is equal to the sum of the actual lift and the loss lift. The pump nameplate indicated on the head is the total pump head. Pump head and conveying distance relationship: Pump lift formula Therefore, we measure the actual head to buy a pump, to the total head (nameplate lift) to take into account the loss of head. Lost head should be based on the length of the pipeline, the end of the valve and other accessories, the general value of the actual head of 10% -20%, namely: the total head of the pump (nameplate lift) = actual lift head + loss (10% -20% The actual lift), through the calculation, we can know how much head pump you need to facilitate the choice. Pump head calculation formula: H = H1 + H2 + V2 ^ 2 / 2g + h1 H1: Vertical distance, meters; H2: Pump outlet pressure, m; V2 ^ 2 / 2g: Pump outlet pressure measurement at the point of kinetic energy, ; h1: hydraulic loss of the well pump tube (take 7 - 9 meters). 1), 300 meters Transmission hydraulic loss: the pipe diameter of 300mm loss of 23 meters; duct diameter 325mm loss of 14 meters; duct diameter of 350mm loss of 10 meters; duct diameter 400mm loss of 5 meters; 2), H1 = 40 meters; 4), v = 2m / s; 5), cavitation margin: deep well pump neglected, centrifuged; 3), H2 = According to the definition of the above 40 meters, can take the water level to the outlet height included in the calculation; Pump just estimate each bit value can be; 6), the prerequisites: the pumping station and the destination pool are standard atmospheric pressure; all six above all the value obtained × 1.1 margin. 325mm pipeline horizontal delivery of 300 meters to reach a height of 40, about head: 66 - 70 meters head. Asia Fluid Network () Editor: Huang Nengwen, QQ: