Hydrogen pipelines. If the United States converts to a hydrogen economy, the ele
ID: 498744 • Letter: H
Question
Hydrogen pipelines. If the United States converts to a hydrogen economy, the electricity produced by power plants and dams will be used directly to decompose water into its elements. Then, instead of pumping electricity everywhere on unsightly power lines, hydrogen will be pumped in a network of unseen underground pipelines. This hydrogen will be used to fuel autos, to heat homes, and to produce small amounts of needed electricity. If this day
3.5 Pipe Leading from a Storage Vessel 63
comes, one trunk pipeline (0.5 m i.d.) will come direct to Corvallis from Bonneville Dam 300 km away. The pressure of H2 entering the pipeline will be 2 MPa; at Corvallis, it will be 1 MPa. The temperature throughout the line can be estimated to be 20 C. Find the flow rate of hydrogen under these conditions in kg/s and in std. m3/s (at 1 atm, 0 C).
Explanation / Answer
The pressure of H2 entering the pipeline will be 2 MPa.
At corvallis = 1 MPa
Temperature throughout the line = 20 C
Gasous flow formulae = Cv= Qg * (Sg)^2/P1
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