Calculated pipe diameter
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What diameter pipe is required for ammonia synthesis second-stage conversion gas at a temperature of 40°C, a pressure of 0.8 MPa, and a flow rate of 5000 Nm3/h?
If low resistance is required, DN250 will suffice. For reference. :lol
The requirement for pressure drop isn’t high; I think the pipe diameter chosen upstairs is a bit large. I think DN150 would be sufficient. This post was last edited by liujia818 on 2009-2-11 12:07.]
Gaseous ammonia: flow rate 5000, pressure 0.8, temperature 40, density: 3.4. Design flow velocity: 10, design pipe diameter: 228.0; selected pipe diameter: 250. Actual flow velocity: 8.32
I’m not sure how the friend upstairs arrived at their calculation – maybe there’s an issue with my formula. Based on the given conditions, it shouldn’t yield the results you obtained. Moreover, in this problem, the density value isn’t needed to calculate the pipe diameter. Do you have a specific method I can refer to? According to my calculations, if a DN250 pipe is used, the actual flow velocity is around 3.54 m/s; if a DN200 pipe is used, the velocity is about 5.53 m/s; and if a DN150 pipe is used, the velocity is roughly 9.83 m/s. Therefore, it’s more appropriate to choose a DN150 pipe