I'm currently working on a project where I need to calculate the foam delivery time to the last nozzle. I used the velocities resulted from the hydraulic calculations. The calculation was done based on the equivalent length of the pipe.
Now I want to calculate the time T=Length/ Velocity. Which Length shall I use? "Actual while ignoring fittings or Equivalent length"?? Keeping in mind that the velocity is from the hydraulic calculation considering the equivalent length.