Circulation flow rate in chemical processing units
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Experts and experts in this field, what is the circulation flow rate of the chemical processing units under your supervision? Thank you all for sharing your valuable advice
1-2.5 m/s; the flow rate is higher for larger pipe diameters, and lower otherwise
Between 0.9 and 3 m/s, rarely exceeding 4.6 m/s
For pipes with a diameter of DN200 or less, the maximum flow velocity can be 2 m/s; for those with a diameter greater than DN250, it can range from 2 to 3.5 m/s. The value is determined based on the principle of economic flow velocity
I think the same way. Thank you; the flow rate of our circulating water is 1.25. A new flow meter has been installed in one of the units, and the flow rate measured is around 2.85. The cause of this issue cannot be identified; the instrument technicians stated that there is nothing wrong with the instrument itself. I’m very depressed
Is this the maximum value? Under normal operation, it’s usually around 1–2; it generally doesn’t exceed 2.5, right?
What is your specific flow rate?
Thank you. What exactly is your flow rate?
DN25: 0.6~0.9m/s； DN50: 0.9~1.4m/s ； DN100: 1.5~2.0m/s ； DN150: 2.0~2.7m/s ； DN200: 2.4~3.0m/s ； DN250: 3.0~3.5m/s ； Larger diameter: 3.0~4.0 m/s. Reference can also be made to SH/T 3035-2018 Guidelines for the Selection of Pipe Sizes in Petrochemical Process Units.
For large-diameter pipes of 2–3 meters, flow rates are normal; it is necessary to choose an economic flow rate, that is, the allowable pressure drop per unit length of pipe. Larger pipes require more investment, but lower flow rates result in less resistance and lower operating costs； Conversely, the pipeline is small, resulting in lower investment costs; however, the flow velocity is high and the resistance is great, leading to higher operating costs for the pump ； Finding a reasonable flow rate by balancing the two is what is commonly referred to as the economic flow rate
Thank you; this is about the liquid flow rate that can be allowed depending on the diameter of the pipe, right?