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To calculate the weight of an ERW (Electric Resistance Welded) pipe, you will need to know the dimensions of the pipe and the density of the material it is made of. Here is a general formula you can use to calculate the weight:

**Weight = (OD - THK) x THK x 0.0246615 x L x Density**

Where:

**OD**= outer diameter of the pipe**THK**= thickness of the pipe**L**= length of the pipe**Density**= mass/volume (density of the material the pipe is made of)

Note: The constant 0.0246615 is used to convert the weight from pounds per cubic inch to pounds per foot.

So, to calculate the weight of an ERW pipe made of a certain material, you would need to:

- Measure the outer diameter (OD) and thickness (THK) of the pipe.
- Determine the length (L) of the pipe.
- Look up the density of the material the pipe is made of.
- Plug the values into the formula above and solve for the weight.

Here is an example:

Suppose you have an ERW pipe with an outer diameter of 10 inches, a thickness of 0.25 inches, and a length of 20 feet, made of carbon steel (density of 0.284 lb/in³). Using the formula above:

Weight = (OD - THK) x THK x 0.0246615 x L x Density Weight = (10 - 0.25) x 0.25 x 0.0246615 x 20 x 0.284 Weight = 46.23 lbs

Therefore, the weight of the carbon steel ERW pipe is 46.23 pounds.

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

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

Weight of empty pipe per unit length can be calculated as

wp = ρm Am

= ρm π (do2 - di2) / 4

= (π / 4) ρm (do2 - di2)

where

wp = weight of empty pipe per unit length (kg/m, lb/in)

ρm = density of pipe material (kg/m3, lb/in3)

Am = cross-sectional wall area of pipe (m2, in2)

do = outside diameter (m, in)

di = do - 2 t = inside diameter (m, in)

t = wall thickness (m, in)

Weight of pipe with liquid can be calculated as

w = wp + wi

= ρm Am + ρl Ai

= (ρm π (do2 - di2) / 4) + (ρl π di2 / 4)

= (π / 4) [ρm (do2 - di2) + ρl di2]

Weight of liquid in pipes per unit length can be calculated as

wl = ρl Ai

= ρl π (di / 2)2

= (π / 4) ρl di2

where

wl = weight of liquid in pipe per unit length of pipe (kg, lb)

Ai = cross-sectional inside area of pipe (m2, in2)

ρl = density of liquid (kg/m3, lb/in3)