C

d2/ d1

percent of the pipe diameter in order to obtain a satisfactory pres-

sure reading.

be determined by measuring the velocity at different

locations in the pipe with a pitot tube and differential

manometer, and computing the flow. The velocity at

any given point can be computed from

(F-3)

where

V = velocity

C = meter coefficient

g = acceleration of gravity

h = velocity head

The flow is equal to the area of the pipe A times the

average velocity V, or

(F-3a)

Q = AV

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