Static pressure in ducts and vessel

[GordonC]

If air is venting thru a 10" duct and there is a static pressure drop of
2” water column for every 100’ of length at 2000 cfm and the duct opens to a 1000 cubic feet airtight vessel and exits through another 100’ of 10” duct how can you find the pressure drop for the tank alone?

 

[Q_Goest]

Hi Gordon. You can add up the pressure losses for each individual portion of the system to come up with a total pressure loss. The loss for the tank, assuming it's large relative to the duct diameter, is only the entrance and exit losses. There's some discussion of that here:
http://utwired.engr.utexas.edu/che354/mom/pfit.ppt
and here:
https://www.physicsforums.com/showthread.php?t=105066&page=2