I have a question regarding pump head
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It’s an alcohol-based fuel project; the general process involves mixing methanol with a stabilizer, which is then pumped through a loading nozzle. The tank used for storing the alcohol-based fuel is a constant-pressure tank with an internal floating roof and a height of 5 meters. A centrifugal pump is connected after this tank, and the pipeline leading from the pump passes through a 7.2-meter-high duct before entering a long straight duct, after which it descends to a height of about 4 meters before reaching the loading nozzle. The pipe diameter is 150 mm before the pump and 100 mm after it; the flow rate is 63 m³/h. I selected a pump with a head of 50 meters, which results in a pressure of 0.45 MPa after the pump, with an axial power consumption of less than 8 kW. Now, the client wants the pump head to be limited to within 20 meters; in that case, the pressure after the pump would be only 0.16 MPa, and the axial power consumption would be less than 4 kW. I’m not sure whether such a pump can meet the requirements. I hope someone experienced can help me figure this out
The pipeline passes through a 7.2m-high pipe gallery and then enters a very long straight pipe gallery~~~a very long straight pipe gallery~~~How long is it? Knowing how long it is determines what constitutes head pressure. You calculated the head to be 50m, while the client believes that 20m is sufficient; it’s not clear from your description who is right or wrong.
It’s best to have an approximate pipe length for calculating the total pressure drop
Roughly estimating, the pressure drop should be kept within 90 KPa at 180 meters; a pressure drop of 50 KPa occurs during pumping over 7 meters, and the pressure after pumping should be around 0.14 MPa. Please ask an expert for guidance
The length of the straight pipe gallery is uncertain; for the outlet pipelines, the head increase by 1 meter for every 10 meters of length； Plus the vertical height ； Additionally, 1 meter of head loss is added for each 90-degree elbow