Diameter and flow rate
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DN350 pipes are used to transport hydrogen at a rate of 50,000 Nm³/h – what is the flow velocity?
If one is to consider the gas flow velocity, it is also necessary to determine the operating conditions; temperature and pressure must be specified. The units you provided are in standard cubic units; they need to be converted to the volume under the current operating conditions. Converted using the ideal gas law PV=nRT
If one is to consider the gas flow velocity, it is also necessary to determine the operating conditions; temperature and pressure must be specified. The units you provided are in standard cubic units; they need to be converted to the volume under the current operating conditions. Converted using the ideal gas law PV=nRT
If one is to consider the gas flow velocity, it is also necessary to determine the operating conditions; temperature and pressure must be specified. The units you provided are in standard cubic units; they need to be converted to the volume under the current operating conditions. Converted using the ideal gas law PV=nRT
You need to know the pressure in order to find out!
For a DN350 pipeline with a wall thickness of 10, the inner diameter is 165. Using the formula (P1*V1)/T1 = (P2*V2)/T2, we can calculate V2. The flow rate is then given by (V2/3600) / (3.14*0.165*0.165)
The instantaneous flow velocity at each point is p1u1=p2u2; what is provided above is the average flow velocity.
The outer diameter and wall thickness are set at 356*10, the inner diameter is 336, the volumetric flow rate is 50,000, and the flow velocity is 156 m/s. This flow velocity is too high; for hydrogen, it generally should not exceed 8 m/s. This volumetric flow rate seems a bit high. There are many resources available that describe methods for calculating flow velocity based on pipe diameter, so you can refer to those sources first.
What’s the use of temperature and pressure if there’s no such thing as a ‘head’?
Flow rate/Cross-sectional area = 4.42 m/s