ASME Steel Pipes Sizes

Overview

Engineering reference data for ASME Steel Pipes Sizes in material science and properties.

Key Formulas

Stress

$\sigma = \frac{F}{A}$

Force per unit area.

Strain

$\varepsilon = \frac{\Delta L}{L_0}$

Change in length per original length.

Hooke's Law

$\sigma = E \varepsilon$

Stress proportional to strain in elastic region.

Thermal Expansion

$\Delta L = \alpha L_0 \Delta T$

Length change due to temperature.

Variables

References

• Original Source

Pipe Dimensions Reference

The ASME/ANSI B36.10/19 standards define pipe dimensions based on nominal pipe size and schedule number. A critical principle: regardless of schedule number, pipes of a particular nominal size all have the same outside diameter. As the schedule number increases, wall thickness increases and the internal bore decreases.

For example, a 4-inch Schedule 40 pipe has an outside diameter of 4.500 inches (114.30 mm) with a wall thickness of 0.237 inches (6.02 mm), yielding a bore of 4.026 inches (102.26 mm). The same 4-inch Schedule 80 pipe maintains the 4.500-inch outside diameter but has a thicker 0.337-inch (8.56 mm) wall, reducing the bore to 3.826 inches (97.18 mm).

Pipe Dimension Formulas

The following relationships are fundamental to pipe sizing calculations:

$d = D - 2t$

Where:

• $d$ = inside diameter (bore)
• $D$ = outside diameter
• $t$ = wall thickness

The inside cross-sectional area:

$A_{inside} = \frac{\pi d^2}{4}$

The cross-sectional area of the pipe wall:

$A_{wall} = \frac{\pi (D^2 - d^2)}{4}$

ASME/ANSI B36.10/19 Carbon, Alloy and Stainless Steel Pipe Dimensions