Pipe Pressure per ASME B31.3 (304.1.2) formula |
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| \( p \;=\; \dfrac{ 2 \cdot t \cdot S \cdot Q \cdot W }{ d - 2 \cdot t \cdot y } \) | ||
| Symbol | English | Metric |
| \( p \) = pressure rating | \(lbf \;/\; in^2\) | \(Pa\) |
| \( S \) = allowable stress | \(lbf \;/\; in^2\) | \(Pa\) |
| \( y \) = ASME B31.3, Table 304.1 | \(lbf \;/\; in^2\) | \(Pa\) |
| \( Q \) = quality factor | \( dimensionless \) | \( dimensionless \) |
| \( t \) = wall thickness of pipe | \( in \) | \(mm \) |
| \( W \) = weld joint strength reduction factor ASME B31.3 Para. 302.3.5(e) (Typically = 1.0) | \( dimensionless \) | \( dimensionless \) |
The pressure rating of comparable pipe material to fitting material.
