I have a question regarding pump selection
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I’m a beginner in process design and have some doubts regarding the selection of pumps for this application. I would appreciate some guidance from those with more experience. I plan to design a simple process flow: a liquid storage tank at atmospheric pressure feeds into a loading arm through a centrifugal pump. The tank has a volume of 100 m3 and a height of 6 meters; the fluid is water, with a flow rate of 50 m3/h. The pipe diameter before the pump is 100 mm, while it’s 80 mm after the pump. The length of the pipe before the pump is 10 meters, with one gate valve installed there. The pipe after the pump is 150 meters long, and it passes through an 8-meter-long duct (with a total length of 100 meters) before reaching the loading arm, which is about 3 meters high. There is also a check valve and two gate valves after the pump. What head should I choose for the pump? I would like to ask: when calculating pump data, how should the pressure and head after the pump be determined? The formula H=△P/ρg has two unknowns; how can H and △P be determined? I hope the experts can give some advice :) Thank you! Are there any relevant materials available for learning*?
HG-T 20570.5-95 \"Calculation of System Characteristics of Pumps and Determination of Relative Installation Height of Equipment\"
The pressure after the pump depends on the resistance of the pipeline. Height and the viscosity of the liquid play a major role in this. The maximum pressure occurs at the moment the valve is closed after loading
The flow rate is 50 cubic meters; the outlet diameter is set at DN80. The head required can be calculated based on the outlet pressure. The vertical head is 3 meters, and a length of 150 meters results in an additional head of about 15 meters. Subtracting the 3 meters of vertical height from these 15 meters gives 12 meters； Excluding elbow losses, Yang Cheng is 15 meters ； Finally, calculate the elbow
This mainly calculates the height and the frictional resistance along the path; adding those two values is sufficient!
If it’s convenient for you, you can add me as a friend. I’ll send you the formula for calculating management resistance. Specializing in the production of pumps. Hehe 13313170275 (same number on WeChat)
https://bbs.hcbbs.com/thread-1764877-1-1.html You can just use the spreadsheet I created to do the calculations. The value of H must take into account the worst-case scenario when the tank is at a low liquid level. △P = Pressure in the gas phase space of the receiving tank – Pressure in the gas phase space of the storage tank; in your case, this value should be 0
Just look up the calculation for pipe resistance within the network