You will need

- Measuring tape

Instruction

1

In the most General case,

d1 = L / N where L is the length of the circumferential section

Thus, D1 is the outer

**the diameter**s**pipe**of wall thickness T can be calculated by measuring the circumference of its cross section. Let this length equal to L. Then, the formula for the circumference of a circle, its**diameter**will be equal tod1 = L / N where L is the length of the circumferential section

**of the pipe**, P = 3,14Thus, D1 is the outer

**diameter**.2

The length of the inner

d2 = d1 – 2 * T, where T is the wall thickness of the

**diameter**and**pipe**will be equal tod2 = d1 – 2 * T, where T is the wall thickness of the

**pipe**3

If you have a piece of

d1 = P * h / S where h is a length

d2 = d1 – 2 * T, where T is the wall thickness of the

**pipe**and is known for its length and surface area, the**diameter**s can be calculated using the formula of the area of the cylinder surfaced1 = P * h / S where h is a length

**of pipe**, S is the surface area, P = 3,14d2 = d1 – 2 * T, where T is the wall thickness of the

**pipe**# Advice 2: How to calculate square pipe

Imagine that you are going to paint supplied to your home gas pipes. As you need to paint? One or two banks? As a rule, containers of paint, to write, to cover a square calculated is the amount of paint. So, in order to determine exactly how many cans of paint to take, you need to calculate the area of gas pipes.

You will need

- roulette;
- - caliper;
- - strong string;
- calculator.

Instruction

1

To calculate the area of a pipe of circular cross-section find out the length of the pipe in linear metres. Also, the calculation will need the outer diameter of the pipe.

2

Calculate the value of the outer diameter of the gas pipe. You can do it two ways. First method – measure the outer diameter of the gas pipe using a Vernier caliper. To do this, open the lips of this measuring tool and attach it to the pipe so that the pipe was between the jaws of the caliper. Then slide the sponge measuring tool: they should be tightly clasp the gas pipe. Looking at the measuring scale, determine the outer diameter of the pipe. The second method is grasp the tube thick thread. Then measure with tape measure the circumference of the pipe. Substituting value in the formula D = L / PI where L is the length of the circumference of the pipe, PI = 3,14 (PI), calculate the value of the outside diameter of the gas pipe. Translate the resulting figure is in meters.

3

Find the area of the gas pipe using the following formula: S = 2*PI*DMP*R, where PI is the number "PI" (3.14), DMP – gas length of pipe in linear meters, and R is the outer radius of the pipe. Given that the diameter is twice the radius, divide the result of the earlier calculations, the increased outer diameter in 2. Put all required data into the formula and calculate the area of the pipe.

Note

Count each measure several times! One mistake will have a significant impact on the final result.

Useful advice

Due to the fact that the current pipe does not meet the standards of GOST, the use of the indicators compiled in the past, the special tables may give an incorrect result. So don't be lazy all the indicators to cross-check yourself.