Hi ,
Either you know the length ( at least 100 m ) or you know the delta P! otherwise you cannot solve your problem .
Are you sure you can apply the Darcy-Weisbach equation to your system ( compressible fluid) ? At least you need to justify it.
Note : In the equation D-W L represents the pipe length , how do you integrate the fittings and other valves?
Probably good for you to review the equation using your favorite search engine.
Again ask help from your supervisor or any text book related to fluid dynamic.
Good luck
Breizh
Edited by breizh, 08 July 2020 - 05:37 AM.