What are the main points of selection of horizontal centrifugal pumps, and what are the main advantages?

What are the main points of selection of horizontal centrifugal pumps, and what are the main advantages?

Specifically include the following aspects:

(1) High-efficiency, low-noise, energy-saving pumps should be selected.

(2) The vertical centrifugal pump should be selected according to the design flow rate and the required lift, and the pump output should be reduced due to wear and other reasons, and the calculated lift date can be multiplied by

The pump should be selected after the coefficient of 1.05~1.10; the characteristic curve should be selected as the pump whose gradual decrease in the Yang process with the increase of the flow rate. The pump works stably and the parallel working time is reliable; and the operating point of the pump should be kept in the high efficiency range, so that Energy saving and not easy to damage the machine.

(3) When there is no adjustment facility for the water supply network, it is advisable to use the speed regulation group or the rated speed pump group to run the water supply. The maximum water output of the pump group should not be less than the design flow of the district water supply, and should be checked by fire protection conditions.

(4) Select the water tank. The lifting pump of the water tower should reduce the number of pumps as much as possible. It should be used one time. When the single pump can meet the requirements, it is not suitable to use multiple parallel modes; if multiple parallel operation or large and small pumps must be used In the case of mode, the number of models and the number of units should not be too much, and the model should not exceed two types.

The range of the process should be similar; each pump should be operated in the high efficiency zone in parallel operation.

(5) The variable frequency speed control pump (group) is designed to meet the requirements of the maximum set flow rate in the domestic water supply system. The power supply must be reliable (dual power supply or dual-loop power supply); the working point of the pump should be selected in the efficient working area of the pump characteristic curve (QH curve), and should not be selected on the extension line of the QH curve. The designed working point should be The right end of the high-efficiency section of the pump characteristic curve, that is, the point where the pump has the largest amount of water and the head is low but can meet the requirements, that is, the intersection of the low point of the pump characteristic curve high-efficiency area and the pipeline characteristic curve. The water pump speed regulation working range can be as high as possible in the pump high efficiency section: the speed regulation range should be set between 25% and 100% of the pump water supply; the equipment should have the water level control function.

(6) The pump unit of the domestic pressurized water supply system shall be provided with a standby pump. The water supply capacity of the standby pump shall be greater than the water supply capacity of the largest operating pump. The pump shall be automatically switched and operated alternately.