Iron Threaded Fittings

Overview

Engineering reference data for Iron Threaded Fittings in piping systems.

Key Formulas

Continuity

$A_1 v_1 = A_2 v_2$

Mass conservation in pipe flow.

Pressure Drop

$\Delta P = f \frac{L}{D} \frac{\rho v^2}{2}$

Darcy-Weisbach equation.

Pipe Area

$A = \frac{\pi D^2}{4}$

Cross-sectional area of a pipe.

Variables

Symbol	Description	Unit
$D$	Pipe diameter	m
$v$	Flow velocity	m/s
$\Delta P$	Pressure drop	Pa
$f$	Friction factor	—

Standard Scope

This standard covers requirements for Classes 150 and 300 threaded malleable iron fittings, including:

• Pressure-temperature ratings
• Size and method of designating openings for reducing fittings
• Marking
• Materials
• Dimensions and tolerances
• Threading
• Coatings

Interactive Charts

References

• Original Source