Underground Natural Gas Pipe

Overview

Engineering reference data for Underground Natural Gas Pipe in gases and compressed air.

Key Formulas

Ideal Gas Law

$PV = nRT$

Pressure × Volume = moles × gas constant × temperature.

Boyle's Law

$P_1 V_1 = P_2 V_2$

At constant temperature.

Charles's Law

$\frac{V_1}{T_1} = \frac{V_2}{T_2}$

At constant pressure.

Variables

Symbol	Description	Unit
$P$	Pressure	Pa
$V$	Volume	m³
$T$	Temperature	K
$R$	Gas constant	8.314 J/(mol·K)

Minimum Cover Depths

For underground natural gas piping, the minimum required depth of cover above the pipe is specified by type:

• Steel Pipe: Requires at least 12 inches (0.3 m) of cover.
• Plastic Pipe: Requires at least 18 inches (0.45 m) of cover.

References

• Original Source