Valves and fittings pressure drop equivalent length

Equivalent length in ft and m for common valves and fittings found in piping systems

Section summary

1. Definition

2. Equivalent length valves

2. Equivalent length fitting


Piping Systems
Equivalent length key pipe components
Singularity coefficient key pipe components
Partially filled pipe
Sonic Velocity
Valves types
Valves Cv
Control valve sizing for gases
Pressure safety valves

1. Definition

When calculating the pressure drop in a pipe, the pressure drop due to singularities, typically valves and fittings, can be calculated thanks to a pressure drop coefficient. However, another method consists in considering that the fitting is equivalent in terms of pressure drop, to a certain longer of straight pipe. This length is called "equivalent length". This page is giving the equivalent length of some common fittings and valves, it can be especially useful for shortcut calculation during preliminary studies or troubleshooting.

2. Equivalent length common valves

Valves pressure drop equivalent length in ft
Valves pressure drop equivalent length in m

3. Equivalent length common fittings

Fittings pressure drop equivalent length in ft

Fittings pressure drop equivalent length in m

Fittings pressure drop equivalent length in ft continued

Fittings pressure drop equivalent length in m continued