How to calculate a steel pipe theoretic weight

Measuring Out Diameter
Measuring Out Diameter

The weight of a pipe depends on the weight density of the material that composes the pipe as well as the physical volume of the pipe. Weight density measures the amount of compactness of the pipe material expressed in pounds per cubic foot.

The volume of a pipe equals its surface area times its thickness. Specifically, the surface area of a pipe is the same as a cylinder and equals the number of square inches that can cover the curved sides of the pipe.

We have the professional engineers, measurement the size of steel pipes.
We have the professional engineers, measurement the size of steel pipes.

Measuring Wall thicknesss
Measuring Wall thicknesss

Oval pipe, Flat oval pipe and elliptic pipe Measuring Flat oval pipe and Elliptic pipe size

Calculate the weight of round pipe and Special Section Tubes
Boiler pipes
T.W.=(D-S)*S*24.65/1000
calculate rectangular pipe
T.W.=((B+A)/2-S)*S*31.4)/1000
Calculat Ellipse pipe
T.W.=12.33*(B+A-2S)*S/1000
calculat_hexagonal_pipe
T.W.=24.65*(1.1*SW+1.2*S)*S/1000
calcualte square pipe
T.W.=(A-S)*S*31.4/1000
calculater ellips pipe
T.W.=[(24.65*(B-S))+(15.7*(A-B))*S]/1000

T.W.=[(A+(B/2*3.14))/2/2-S]*S*3.14

T.W.=24.65*(1.06*SW+1.11*S)*S/1000
Gather the necessary information.

You will need to know the outside diameter of the pipe. This is the distance of a straight line that runs through the center of the pipe and connects two points on the pipe’s surface. You will also need to know the wall thickness of the pipe. Both of these measurements should be taken in inches. The final thing that you will need to know is the length of the pipe. This last measurement should be taken in feet.

Subtract the pipe’s wall thickness from the pipe’s outside diameter. For example, if you had a pipe with a diameter of six inches and a wall thickness of two inches, you would subtract two from six to get four.

Pipe Weight Calculator – Imperial and Metric

Pipe Weight Formula – This formula can be used to determine the weight per foot for any size of pipe with any wall thickness.

The imperial formula is:
Wt/Ft = 10.69*(OD – Wall Thickness)*Wall Thickness

The weight of any tube can be calculated with the following formulas. Simply multiply the appropriate alloy density by the calculation shown below of the required part.

Imperial Example
density (lbs/in³) 0.284 lbs/in³
x
(OD² - (OD - 2xT)²) (3.0 in² - (3.0 in - 2x0.022 in)²)
x
Length 12in
x
π/4
=
weight 0.702  lbs

* Totals should be used as an estimate of weight.

Metric Example
density (g/cm³) 7.85g/cm³
x
(OD² - (OD - 2xT)²) (50.0 mm² - (50.0 mm - 2x1.0 mm)²)
x
Length 1m
x
π/4000
=
weight 1.209 kg

* Totals should be used as an estimate of weight.to change this html

Wall thickness tolerance of steel pipe

Seamless pipes are extensively applied for the nuclear device, gas, petrochemical, ship building and boiler industries. seamless pipes dominates 65% of market share in Chinese boiler industry.

Measurement out diameter
Types Sizes allowed tolerance
Ordinary steel pipe
Senior steel pipe
Hot rolled
Out diameter <50 ± 0.50 mm
± 0.40 mm
≥50 ± 1 %
± 0.75 %
Wall thickness <4 ± 12.5 %
± 10 %
4-20 +15%
-12.5%

± 10 %
≥20
± 12.5 %
± 10 %
Cold drawn Out diameter
6-10 ± 0.20 mm 
± 0.10 mm
>10-30 ± 0.40 mm
± 0.20 mm
>30-50 ± 0.45 mm
± 0.25 mm
>50 ± 1 %
± 0.5 %
Wall thickness ≤1
± 0.15 mm
± 0.12 mm
1-3 + 15 %
- 10 %
± 10 %
>3 + 12.5
- 10 %
± 10 %


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