Title: Flexible hoose.pdf
In order to determine the friction loss of the flexible hose shown below, flow measurements were taken at 5 gal/min (18.9 L/min) increments from 25 gal/min. to 65 gal/min. (94.6 L/min. to 246 L./min.) on each hose length with a sprinkler head threaded into the outlet of the test assembly. Measurements were conducted nominal discharge coefficient (K-factors) of 5.6 gal/min/(psi)1/2. The data listed below was obtained with the sprinkler attached to the hose, with the hose bent at its minimum bend radius (with multiple bends) to achieve the maximum friction loss. A series of flow versus pressure drop measurements were conducted to obtain the net friction loss across the hose. The average Cv coefficient was then calculated using the formula Cv = Q/P 1/2 where Q is the flow rate in gpm and ΔP is the net friction loss in psi across the hose. The net friction loss was then equated to the corresponding theoretical length of nominal 1 in. diameter Schedule 40 sprinkler pipe. The results are shown below.