Questions about lift
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Almighty sea friends: A clean water pump IS100-80-160, Q=100m3/h, H=32m, with a supporting power of 15KW-2. Assume that the outlet height is 10m (the height is relative to the surface of the pump outlet) and the outlet height is 20m. Are their flow rates the same? Is the water that can be transported the same? What if the exit height is 32m? (Regardless of valve elbow and pipe damage, the pump inlet pressure is the same). What happens if pipe damage is considered? I hope everyone can discuss it together, thank you!
Each pump has a performance curve. Take a look and get a good understanding of how to use it.
The flow rate at an outlet height of 20m is slightly smaller than that at an outlet height of 10m.
Lift and flow rate are inversely related to each other in a parabolic curve.
This diagram reflects many types of pump adjustment methods. The operating point of the pump is the point where the pump performance curve intersects the device (pipeline) characteristic curve.
The flow rate at a height of 20 meters is less than that at a height of 10 meters. The lift is the height that the pump can pump. If the loss of the damaged pipe elbow is added, the lift will not be that high.
Check the performance curve of the pump factory data to get the corresponding data.
I couldn't find a sample of IS100-80-160, so I got a sample of a dark blue OH2 pump, and only calculated the original poster's pump from a mechanical point of view. The red line is the simulation curve of the original pump of the original poster, with a flow rate of 100 cubic meters, a rated lift of 32 meters, and a 15kW motor. Judging from the performance curve, the efficiency under rated working conditions is about 66%, the shaft power is about 13.21kW, and a 15kW motor can be used, but this project should not be done in accordance with API 610. According to the requirements of API 610 Table 1, for motors less than 22kW, the motor rated power is 1.25 times the shaft power, so at least a 16.5kW motor should be selected. Judging from the working condition of 20 meters of lift described by the poster, it has reached the far right end of the performance curve, and it can still be used even if it is barely usable. Then, at the end of the performance curve, the pump head is 20 meters, the output flow is 200 cubic meters, the efficiency is about 71%, and the shaft power is about 15.35kW. In other words, the poster's existing motor is definitely dead. As for the 10-meter lift mentioned by the poster, it cannot be reached because the pump can only pump 200 cubic meters. Therefore, lowering the outlet pressure can only give you so much water. If the poster's system is an open system, it can shoot farther at most. The same goes for exploding the motor. The above calculation is only for the calculation of the pump itself. If the system outlet pressure is required for a head of 20 meters, plus the system resistance drop, the flow rate will be reduced accordingly. above
Dear, what did you use to draw the lines and the triangles where the lines intersect on the picture?