EBK MINDTAP FOR HERMAN'S UNDERSTANDING
4th Edition
ISBN: 9781337798761
Author: Herman
Publisher: VST
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Chapter 53, Problem 8RQ
To determine
The components used to determine the amount of time the output remains turned off.
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Problem (13): A pump is being used to lift water from the bottom
tank to the top tank in a galvanized iron pipe at a discharge (Q).
The length and diameter of the pipe section from the bottom tank
to the pump are (L₁) and (d₁), respectively. The length and
diameter of the pipe section from the pump to the top tank are
(L2) and (d2), respectively.
Given the values of Q [L/s], L₁ [m], d₁ [m], L₂ [m], d₂ [m],
calculate total head loss due to friction (i.e., major loss) in the
pipe (hmajor-loss) in [cm].
Givens:
L₁,d₁
Pump
L₂,d2
오
0.533 lit/s
L1 =
6920.729 m
d1 =
1.065 m
L2 =
70.946 m
d2
0.072 m
Answers:
(1)
3.069 cm
(2) 3.914 cm
( 3 ) 2.519 cm
( 4 ) 1.855 cm
TABLE 8.1
Equivalent Roughness for New Pipes
Pipe
Riveted steel
Concrete
Wood stave
Cast iron
Galvanized iron
Equivalent Roughness, &
Feet
Millimeters
0.003-0.03 0.9-9.0
0.001-0.01 0.3-3.0
0.0006-0.003 0.18-0.9
0.00085
0.26
0.0005
0.15
0.045
0.000005
0.0015
0.0 (smooth) 0.0 (smooth)
Commercial steel or wrought iron 0.00015
Drawn…
The flow rate is 12.275 Liters/s and the diameter is 6.266 cm.
An experimental setup is being built to study the flow in a large water main (i.e., a large pipe). The water main is
expected to convey a discharge (Qp). The experimental tube will be built at a length scale of 1/20 of the actual
water main. After building the experimental setup, the pressure drop per unit length in the model tube (APm/Lm)
is measured.
Problem (20): Given the value of APm/Lm [kPa/m], and assuming pressure coefficient similitude, calculate the
drop in the pressure per unit length of the water main (APP/Lp) in [Pa/m].
Givens:
AP M/L m = 590.637 kPa/m
meen
Answers:
( 1 ) 59.369 Pa/m
( 2 )
73.83 Pa/m
(3)
95.443 Pa/m
( 4 ) 44.444 Pa/m
*******
Chapter 53 Solutions
EBK MINDTAP FOR HERMAN'S UNDERSTANDING
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