1. Lift is the vertical distance from the liquid to the pump inlet flange center, refers to the liquid pump unit mass of the import and export of energy difference.
Specific example: if it is ordinary water pump, pump head is 50 meters, 50 meters in fact, minus the value of the loss along the way and the line loss of the pipeline is the value of the pump suction tank level to lift the height of the distance.
2. Line loss, including the loss of the pipeline and the local loss. Along the process loss and pipe material, pipe diameter, conveying medium flow rate and viscosity; local loss is mainly refers to the tapered tube, pipe, and the valve caused by the loss, the loss of algorithm can be related to fluid mechanics books for reference. In actual calculation, the local loss is relatively small, which can be estimated directly. General centrifugal pump product catalog of head instructions are taken from the manufacturer's average estimate, specific to the actual application in combination with different occasions to carry out the actual field of scientific analysis. Here is not one example shows.
3. General centrifugal pump, with the pump flow increased, the head will be reduced. This is the characteristic of the pump itself. But to the pipeline system, the flow rate is larger, the required lift is higher. Pump characteristics and pipeline characteristics will have a balance point (a point of view is that the pump characteristic curve and pipeline characteristic curve of the intersection point) that is, the pump operating point. Selection is according to the flow of pipeline transportation, calculate the required lift, according to media, flow, head to elect a suitable type of pump, and pump seal, materials and motors and other facilities
