I need to know how to to determine the work needed to push water through a 20 foot thinwall plastic tube ( Polyethylene) with an inner diameter of 4 mm at a rate of 100, 250 and 500 mL/minute. The tube is level throughout. What pressure will I need? How much energy does this take ? Accuracy not needed just an approx figure will be fine at this time, as we will run testing later. The reason for need this is to select a pump for the job.
Thank you so much .