Working range and profile of the pump
Each point on the pump characteristic curve corresponds to a working condition point. It is ideal to operate the pump at the most efficient point. However, the performance required by users varies widely and may not be consistent with the performance at the highest efficiency point. In order to make every pump required by the user run at the highest efficiency point of the pump, there are too many specifications of the required pump. To this end, a range is specified (usually bounded by a 5% -8% reduction in efficiency). When the pump runs in this range, the efficiency drop is not too big. This section is called the working range of the pump.
The working range of many pumps is drawn in a coordinate chart, called the profile. In order to make the figure coordinate, the working range at high head and large flow is not too large, usually expressed in logarithmic coordinates.
Generally, each series pump has a profile. The so-called series refers to pumps of the same type of structure (such as single-stage cantilever, double suction pump, segmented multi-stage pump series) or a certain purpose pump (chemical process pump, boiler feed pump series). The specifications refer to pumps with different sizes and performance in the same series.
The series spectrum is for users to choose the pump they need, on the one hand it is used to point out the direction of developing new products.
The following figure is the type spectrum of our double-suction pump.
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