How to Find the Cross Sectional Area of a Pipe

Pipes underneath sink.
••• Gary Ombler/Dorling Kindersley RF/Getty Images

The pipe's cross-sectional area has a number of applications in fluid dynamics, letting you calculate a pipe's flow rate or pressure drop. The measurement relates directly to the pipe's internal diameter. The factor relating the pipe's diameter and its area is pi, which is also the ratio between the pipe's diameter and circumference. If you divide a circle into a large number of wedges, they can form a quadrilateral whose width is the circle's radius and whose length is half the circumference.

    Divide the pipe's diameter by 2 to find its radius. If it measures, for instance, 8 inches in length, divide 8 by 2 to get 4 inches.

    Square this radius. In the example, 4^2 = 16 square inches.

    Multiply the result by pi, which is approximately 3.142 -- 16 x 3.142 = 50.27 square inches. This is the pipe's cross-sectional area.

Related Articles

Characteristics of Aquatic Plants
How to Find the Volume of a Sphere in Terms of Pi
How to Calculate a Circular Area
How to Calculate the Volume and Circumference of a...
How to Find the Area of Squares
How to Divide Rational Numbers
How to Calculate the Linear Footage in a Radius
How to Calculate the Area of a Curved Surface
How to Calculate Wheel Circumference
How to Calculate the Area of a Pipe
How to Convert Square Dimensions to Round
How to Measure Area
How to Convert Centimeters to Centimeters Squared
How to Calculate Arctan
How to Find the Radius of a Sector
How to Figure the Cubic Yards in a Circle
How to Calculate Volume of a Circular Cylinder
How to Find the Radius of a Cone
How to Find the Radius
How to Calculate the Volume of Liquid in a Pipe

Dont Go!

We Have More Great Sciencing Articles!