Pump selection and calculation
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I would like to ask everyone for advice: I have a sink from which water is pumped to a height of about 3 meters for spraying. How should I choose the appropriate pump and determine its parameters? The medium is clean water, and the pipeline diameter is DN40. I hope the experts here can help me out
I calculated the head and flow rate of the pump myself; the parameters of the pump seem to be fine. However, at the end of the water spray pipe, the self-priming pump doesn’t generate much pressure there, while there is high pressure at the front end. I’m not sure what’s causing this issue; I hope you can help me out
May I ask what flow rate and head you selected for the water pump?
Head: 12 meters, flow rate: 16 cubic meters per hour, power: 0.55 KW
Where does the front-end end pressure you mentioned come from? If it’s measured directly by a pressure gauge or something, then is the measurement taken at the sealed end? If not, then the pressure is quite high, almost at atmospheric pressure
For DN40 pipes, the flow rate seems to be too high. It is also necessary to check for any blockages, and the nozzles require a certain pressure drop as well.
Yes, putting my earlier question aside, you also chose a too small diameter for this pipe
Parameter is missing. What is the spray pressure? If there are no special requirements, the head is 10 meters and the flow rate is 10 cubic meters. The calculation formula is based on Bernoulli’s equation.
The resistance of the nozzle is too high. Is it because the nozzle isn’t spraying much water? When the nozzle was removed, the water flow was much stronger
The nozzle is essentially just a row of holes made in a pipe; water is sprayed from the end of the nozzle, and it seems to lack pressure, with no significant pressure at the front end