Question

Water (ρ = 999 kg/m3, μ = 1.3x10-3 N/s) from a large tank with P1 flows through a pipeline at the rate of 0.14 m3/s to atmosphere as shown. The pipe diameter of the entire piping system is 20 cm and material is cast iron. Knowing discharge velocity V2 is the same as the flow velocity in the pipe, no discharging nozzle loss, Kinlet = 0.5, and Kelbow = 1.1, calculate the absolute P1 (MPa) in the tank needed to keep the flow through the pipeline with head loss to atmosphere.

Answer #1

Water, with a density of ρ = 1155 kg/m3, flows in a horizontal
pipe. In one segment of the pipe the flow speed is v1 = 7.73 m/s.
In a second segment the flow speed is v2 = 1.57 m/s. What is the
difference between the pressure in the second segment (P2) and the
pressure in the first segment (P1) ?

Water at 100oF flows from one tank to another through
two pipes A (D=3") & B (D=6") running in parallel between the
same two tanks through the same drop in elevation (25 ft). The
lengths of the 3” and 6” new, asphalt-dipped cast iron pipe (ϵ =
0.0004 ft) are 100 ft. Use ν=7.4 x 10-6
ft2/s. Determine the flow in cfs . Ignoring
minor losses ...determine QA and
QB.

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