Water pump selection issues
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What are the principles and basis for water pump selection? For example, for a 30,000m3/h circulating water station, what size of water pump should be selected? How many water pumps of this type are needed?
This depends on the needs of your process to determine the water circulation volume, that is, the flow rate of the pump, and the lift of the pump based on the height of water demand.
Theoretically, the sum of the flow rates of parallel pumps = the total flow rate of the system! For example: The system has a flow rate of 10,000 cubic meters/hour. I can choose two 5,000 cubic meters/hour or four 2,500 cubic meters/hour water pumps to run in parallel, but this is actually not possible! A margin will be taken, and the regulations of companies in various industries are different. For our heat exchange units, the general margin is 10%. That is to say, for a 1,000 cubic meter/hour system, I would choose two 5,500 cubic meter/hour water pumps, or four 2,750 cubic meter/hour water pumps to run in parallel.
Brother, if you are new to the industry, this issue needs to be considered based on the actual situation of the process. The selection of pumps in the circulating water station is not based on the capacity of the pool, but on the purpose of the water in the circulating water station. For example, if the water in the circulating water station needs to be heat exchanged, the pump that supplies the cooling water tower is selected based on the cooling water usage. The process requirements of the water tower are selected, and the flow rate of the supply system is obtained based on the system requirements. This is a known condition. Based on this condition, the pump supply with the required flow rate is determined. As for the lift, the required lift is calculated based on the equipment layout and pipeline length.
The selection mainly depends on the flow rate, head, pipeline loss, allowable suction height, etc. of the pump. Sometimes factors such as appearance size must also be considered.