Should the pipe diameter be calculated based on the recommended flow velocity or the recommended pressure drop per 100 meters?
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DN25, air at 0.8 MPaG at the inlet, atmospheric pressure at the outlet. HG/T20570: For compressed gases with p=0.6~1MPa, the recommended flow rate is 10~15 m/s. Blue Book 0.35
The pressure drop is too high, which is not economical; a pipe with a larger diameter can be used. It should be designed based on the gas flow rate you need. The flow rate is only a recommended value; it should be low, not high. Therefore, you can choose a lower flow rate.