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446 NOTES ON HYDRAULICS.
Example.
Find the velocity of discharge from a pipe six inches in diam-
eter. The head is 16 feet and the length of the pipe is 100
feet, and coefficient of friction 0.025.
Solution
:
(Note. 6 inches = 0.5 foot.)
VD4.
64.4 X 16
100
025 X -ox
v = ^-
1030.4
6.5
v = 12.6 feet per second.
In Table No. 8ithe quantity of water discharged per min-
ute by a pipe six inches in diameter, when the velocity is one foot
per second, is 88.14 gallons. Thus, the quantity of water deliv-
ered when the velocity is 12.6 feet per second, is 12.6 X 88.14 =
1110.6 gallons per minute.
When the length of the pipe is more than 4,000 diameters
the velocity of the water may be calculated by the formula,
and the quantity is obtained by multiplying the velocity by the
constants given in Table No. 8i.
Example.
Find the velocity of efflux from a water pipe of three
inches diameter and 1200 feet long, having a head of six feet,
assuming coefficient of friction as 0.025.
Solution
:
64.4 X 6
64.4 X 6 ^ r
V = Vnno- s^OO = *-™ feet Per SeCOnd
Discharge in gallons per minute
:
q — 22.03 X 1.79 = 39.4 gallons per minute.
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