Question

Water flow horizontally for 4 m through a 65mm diameter cast iron pipe at an average velocity of 2 ms-1before an 90 degree elbow changes the direction of the flow downwards for a further 9 m. A ball valve is fitted at the end of the 9 m length of pipe. Determine the pressure at the pipe inlet if the ball valve is fully opend.(density of water = 998 kgm-3 , u=8.9*10^-4 Pas)

I just calculated the friction losses before the direction changed, and from the Moody's chart, I got friction factor is around 0.026, the value of friction losses I got is 3193.6

And what should I do next?

Answer #1

3. Water flows through 80 ft of a 4” cast iron pipe. The head
loss through the pipe is 0.27 ft. What is the volume flow rate of
water through the pipe, in cfs? [Type II]

Water is flowing at the rate of 1.676 m/s in a 3.068 inches’
diameter horizontal pipe at a pressure p1 of 68.9 kPa. It then
passes to a pipe having an inside diameter of 2.067 inch. The
density of the water is 998 kg/m3 . a) Calculate the new pressure
p2 in the 2.067inch pipe. Assume no friction losses b) If
the piping is vertical and the flow is upward, calculate the new
pressure p2. The pressure tap for p2...

Design a cast iron (kd=8*10‐4 ft) pressurized system (pipe
diameter) that would convey water at 2 ft3/s from two elevated
tanks separated 200 ft long. The difference in water surface
elevation between the tanks is 20 ft and the kinematic viscosity is
1.217*10‐5 ft2/s. Along the system the entrance loss and the exit
loss have a KL of 0.5 and 1, respectively. Two 90 degrees bends are
present (KL=3) and a global valve (KL=10) is also installed along
the system.

Water flows through a pipe of 5mm in diameter with a mean
velocity of 0.2 m/s. The dynamic viscosity of the water is given as
10-3 Pa s. Establish whether the equation f = 64/Re may be used to
calculate the friction factor for this flow.

Water flows through a 5-cm-diameter pipe at the
average velocity of 1.25 m/s.
(a) In the dimensions of L/s, what is the volumetric
flow rate?
(b) If the diameter of the pipe is reduced by 20% at a
constriction, by what percentage does the water’s velocity
change?
I need answer only in typed form. otherwise I'll
downvote

1-
Water flows in a 10 m long and 4 cm diameter pipe
contains 4 elbows ( KL= 0.2 ) at velocity 8 m/s.
Calculate the total head losses when the friction factor
f=0.03
35.56 m
22.07 m
27.07 m
15.46 m
2- water flows in a 10 m long and 5 cm diameter
horizontal pipe at rate 15 l/s
Calculate the pressure drop
Take the density of water 1000 kg/m3 and the
dynamic viscosity 0.001 kg/m.s
74.13 kPa
96.41...

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