What is the formula for calculating the area of an 8 inch pipe in square feet?

Question

I have the velocity reading in an 8 inch pipe and want to convert this to a flow rate in cubic feet per minute. Thanks.

Answer 1

8 inches=2/3 ft.
radius of the pipe=1/3 ft
Area of the pipe
=pi*r^2
=3.14*(1/3)^2
=3.14*1/9
=0.3489 ft^2
Multiply this by the flow rate per minute

Answer 2

The area of a circle is pi (3.1416) times the radius (1/2 the diameter) squared. The volume of of a pipe or a cylinder is that result times the length: L * pi * r^^2. 8 * 3.1416 * 1 * 1 = 25.133 square feet

Answer 3

8 inches is 2/3 rd of a foot and area of a circle of diameter d is pi.d^2 / 4 = 3.1416 x 2 x 2 / (3 x 3 x 4) = 0.3491 sq.ft

Flow rate is Volume / second

Volume = area x velocity

So flow rate = area x velocity / second

Answer 4

Flow rate = velocity * cross-sectional area

velocity = v (velocity in feet per minute)
cross-sectional area = pi*4^2 = 16pi in^2 = pi/9 foot^2

Flow rate = v * pi/9 foot^3 per minute

Answer 5

Just get all your units the same. So 8 in = 8/12 ft = 0.666 ft
The volume of the pipe will be Pi x Radius^2 x length. I assume by an 8in pipe you mean 8in diam. So radius = 0.333 ft

Answer 6

the cross-section area of an 8 in diameter pipe is
pi (4)(4) = 16 pi = 50.27 sq.in
= 0.349 sq. ft

Suppose your velocity reading is v ft/minute

then your flow rate = velocity reading X area
= 0.349v cu ft / min

Answer 7

cross-sectional area = pi (r^2)