Determine the specific type of pump, the pump is adopted after the series, you can press the maximum flow rate, zoom 5% - 10% margin of the head after the performance of these two main parameters, the type of spectrum or series of characteristic curves to determine the specific models.
Use of the pump characteristic curve, find the flow on the horizontal axis value, find the head on the vertical axis value, the value from the two lead up and right, respectively, vertical or horizontal line, Chemical pumpsright on the intersection of two lines on the curve, then The pump is to choose the pump, but this is generally not an ideal situation rarely, usually run into the following situations:

A, first: the intersection of the curve at the top, indicating that flow to meet the requirements, but the head is not enough, then, if the head difference, soon after, or a difference of about 5%, still used, a lot of difference if the lift, then head over election large pump. Reduce pipeline pressure loss or ideas.
B, the second: the intersection of the curve below the ladder in the pump characteristic curve fan within this model on the initial set, then the difference between the head,Suber-water pumps to decide whether to cut the impeller diameter, if the head difference is small, do not cut If the head a big difference on the desired Q, H,, ns and cut according to the formula, cutting impeller diameter, if the intersection does not fall within the scope of trapezoidal fan, you should choose a smaller pump head.
Selected pump, sometimes have to consider the production process requirements, selection of different shapes QH characteristic curve.

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2011-11-21

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