I have a question regarding hydrogen gas flow velocity and flow rate!
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I would like to ask: the hydrogen pressure coming out of the cylinder bank is 13 Mpa, and the pipe diameter is DN25. What are the normal flow rates and velocities for such pipes, and what are the maximum values? How should it be calculated? Thank you
The calculation formula for flow rate and velocity is a basic geometric formula: q = 3.14*0.025*0.025/4*v*3600. The optimal velocity is 8 m/s; the maximum velocity is assumed to be 340 m/s, based on a valve diameter of 4 mm in the gas cylinder
When the pressure is greater than 1.6 MPa, the flow rate is 8 m/s; it is 12 m/s for pressures between 0.1 and 1.6 MPa, and 15 m/s for stainless steel pipes. If the flow rate is too high, friction against the pipe walls increases, and especially when there are rust particles in the pipeline, static electricity sparks can be generated. Of course, these economic flow rates are much lower compared to those abroad; in some cases they have even dropped to 50 m/s. It’s just for reference. With the flow rate, the volume flow rate is determined.
15 m/s, maximum not exceeding 25 m/s