The new factory building needs cooling circulating water, and the water digs wells from the ground. Ask God for advice on how to choose a pump.

Since the capacity of your well is only about 40 tons, it is suggested to build a reservoir (if you have less equipment, you can certainly not build a reservoir, but you should confirm the output of the well to ensure that the well will not be drained) to ensure recycling, which can also increase the flow. Change the water after the water quality becomes worse. If your circulating water doesn't need 24-hour uninterrupted circulation, you can use a valve and only one pump. Of course, maybe you need another pump in case of failure or regular maintenance.

Flow: To calculate the cooling water flow required by the whole plant, it is necessary to know the tolerance temperature of the equipment (usually determined according to the type of hydraulic oil used, generally 70 degrees can be used), the pool water temperature and the total calorific value of the equipment (the theoretical calculation error is large, mainly depending on the number and power of the equipment, the manufacturing accuracy of the equipment, the service life of the equipment and the maintenance status, etc.). , which can be determined by actual measurement), and ensure that the cooling water takes away enough heat and the temperature of the hydraulic oil tank is not higher than that of the heat exchanger. The economic flow of 1.5 inch pipe is about 4 tons/hour. If it is bigger, the head loss will increase a lot and the life of the pump will be shortened.

Lift: Lift is mainly used to provide enough water pressure, overcome the resistance of height and the whole flow passage, and make the cooling water flow smoothly. The height is easy to calculate, which is the maximum height from the outlet of the pump to the cooling water. The flow channel includes pipes, pipes inside the heat exchanger, filters and various accessories. And the calculation is complicated. Generally speaking, the head loss can be estimated as 10% of the pipeline length. From your simple description, I recommend the 30-meter elevator.

You can also consult the pump manufacturer and ask them to help you calculate the pump and motor. Compare the three stores and you will have an idea, hehe.