Does a orifice plate flow meter require consideration of safe flow velocity?
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It is well known that as a fluid passes through an orifice plate, its flow velocity increases while its pressure decreases. When measuring hydrogen gas as the fluid, is it necessary to take into account a safe flow velocity? Should this consideration be applied only within the pipeline, or does it also need to be taken into account at the location of the orifice plate?
I need to check the specifications; let’s get an answer downstairs. There is a speed limit for oxygen – is there one as well for hydrogen?
Safety is the first thing to consider...
According to the design specifications for hydrogen stations, for stainless steel pipes operating at a hydrogen design pressure of 0.1–3.0 MPa, the flow velocity can reach 25 m/s. In carbon steel pipes, the maximum flow velocity at pressures above 3.0 MPa is 10 m/s, while it can be 15 m/s for pressures in the 0.1–3.0 MPa range. Therefore, the material of the orifice plate must be selected based on the required flow velocity, and the suitability of the pipe material should be verified by checking the flow velocity downstream of the orifice plate. If that doesn’t work, you can make the holes in the orifice plate larger