Seeking help in calculating the air consumption for a compressed air purging system! ! ! Thank you

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This post was last edited by yggswl on 2016-12-24 at 16:39. Seeking help in calculating the air consumption for compressed air purging devices! ! ! Thank you. There is currently a gas storage tank with a capacity of 10 cubic meters, at a pressure of 0.8 MPa. The air compressor has a flow rate of 3.5 cubic meters per minute (this refers to the inlet flow rate of the compressor, under standard conditions), also at a pressure of 0.8 MPa. There is a switch valve located after the gas storage tank. The pipeline has a diameter of DN65, and its length is 50 meters. At the end of the pipeline, there are 60 nozzles with a diameter of 3 mm, and each nozzle operates for 7 minutes at a time. Could you please calculate the compressed air flow rate in the pipeline and the pressure before it exits the nozzle? When the nozzle is in operation and the valve is fully open, how much pressure will remain in the air tank after 7 minutes? It would be best to provide the calculation process. Thank you all for helping with the calculations! :handshake @angryant @QingchengJun @chuanhengmpq @huagongjia @XiaoguiZuiHaoBa @ylb913 @engineer021 @waaabc @arpcd @gn_1984