How to choose the horizontal centrifugal pump

1, we should choose the horizontal centrifugal pump with high efficiency, low noise and energy saving, and strictly prohibit the selection of the products.

2, according to the design flow, required lift pump selection, and consider the pump due to wear and other causes of decreased pump output, according to the calculated lift H multiplied by 1.05 ~ 1.10 coefficient of pump selection should be chosen; characteristic curve for the head decreased gradually with the increase of runoff water pump, the pump is stable so, working in parallel reliable; operating point and the pump should keep running in the high range, thus saving energy and not easily damaged parts.

3. When the water supply network is not regulated, the water supply should be set up by the speed pump group or the rated speed pump group. The maximum water output of the pump group should not be less than the design flow of the water supply in the District, and should be checked by the fire control condition.

4, water tank, pump water tower should minimize the number of pumps should be a one; when the single pump can meet the requirements, can not use multiple parallel mode; if must use the pump operation or the size of multiple parallel collocation method, its type and number should not be too much, more than two kinds of type No. not, horizontal centrifugal pump head should be similar; parallel operation of each pump should still run in high efficiency range.

5. The design of the water supply flow of the variable frequency speed control pump should meet the requirements of the maximum design second flow in the living water system. The power supply shall be reliable; the pump operating point should be selected in the high efficiency area of pump characteristic curve, and shall not be selected in the Q-H curve extension line, design the most unfavorable work point should be right at the end of pump characteristic curve, section, i.e. pump out the water, and the maximum lift is low but can satisfy the requirements. It is low and the pipeline characteristic curve of pump characteristic curve, the intersection area. The speed range of the pump can be as high as possible in the efficient section of the pump, and the speed range should be set at 25% to 100% of the water supply volume of the pump. The equipment should have the function of automatic control of water level.

6, the water pump unit of the life pressurized water supply system should set up a standby pump. The water supply capacity of the standby pump should be greater than that of the largest one, and the pump should be switched automatically and alternatively.

7. The voltage of the motor of the horizontal centrifugal pump should be the same, and the power supply mode should be the same as that of the state power grid.

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