To characterize this region the hydrodynamic entrance length is introduced and is approximately equal to: The maximum hydrodynamic entrance length, at ReD,crit = 2300 (laminar flow), is L e = 138d, where D is the diameter of the pipe. This is the longest development length possible. Pressure loss for many types of pipes can be found here. 4. Add Equivalent Length of all Valves, Fittings and Straight Pipes. Add the equivalent length of all valves, components, fittings and straight pipes in the sections. 5. Summarize the Pressure Loss in each Section. Calculate and summarize the pressure loss in each section. 6.
(2) Determine the length of pipe from the gas meter to the most remote outlet (outlet A) is 60 feet. Sec 1 (10) + Sec 2 (10) + Sec 3 (30) = 60 (3) Using the length in feet column row marked 60 feet in Table 2 * for type of pipe: Outlet A, supplying 32 cubic feet per hour, requires ½ inch pipe. • At first, equivalent pipe for the pipes 2 and 3 are determined as the pipes 2 and 3 are in series. Then, the head loss in both the pipes are found using Hazen Williams's equation. • After computing the total head loss, the equivalent length of pipe 2′ are calculated by relocating the Hazen Williams's equation. • The equivalent pipe for the above computed pipes and pipe 4 are determined. Then the equivalent length of pipe 3′ is found.
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