Which engineer can tell me how much water at most can flow through a DN20 pipe?
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May I ask what is the maximum flow rate for pipes of different sizes, and what is the highest possible flow velocity?
The flow rate issue, once the diameter is determined, is essentially a matter of flow velocity; generally, the flow velocity of water is between 1 and 3.5 m/s, with the exact value dapat be calculated by oneself； I don’t know what purpose DN20 pipes are for. For the selection of pipe diameter, please refer to HG/20570.6 \"Pipe Diameter Selection\". Make a decision after comprehensive consideration.
This post was last edited by yjfxy928 on 2010-7-5 13:57. Theoretically, it can reach very high values, but it is not an economic flow rate! Detailed data can be found in Table 25-5, \"Recommended Flow Rates for Common Media,\" in the second volume of the \"Handbook of Chemical Process Design\" (3rd edition).
Reply to 3# yjfxy928: Thank you very much, I’ll go look for it
To increase the flow rate, power support is required, and a comprehensive consideration of various factors is necessary
Generally, 1.0 m/s is taken as the value. For a DN20 pipe, it is considered to have a diameter of φ25*2. The flow rate is calculated as 0.785*0.021^2*1.0*3600 = 1.25 m3/h. Issues like this probably don’t require the help of a senior engineer; even those with mechanical expertise should know basic principles related to fluid flow. It’s better to read some books on the topic rather than reaching out for help every time.
When performing process calculations, the flow velocity range for water is 1.0~3.0 m/s; the value of 1# refers to the maximum flow rate of water, so u = 3.00 m/s is used. The pipe specification for DN20 is Φ25*2, meaning di=0.021m. Using the formula di^2=4V/3.14*u, we get V=0.785*0.021^2*3.0*3600=3.74m3/h
Reply to 7# zhxy20081986: Thank you everyone. In actual tests, the flow velocity in the pipe can reach 10 m/s, but it certainly isn’t an economical flow velocity
The economic flow rate should be selected in accordance with the pipe diameter and flow velocity.
The selection of flow rate is a trade-off between one-time investment and operating costs.
In short, it depends on the pressure in your pipeline; the higher the pressure, the more