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Equivalent length of a pipe is a term applied to express the pressure drop generated by valves and fitting in a pipe.
In literature, you usually find ratios of equivalent length to diameter of the pipe. For example, L/D for a fully opened globe valve is 300. This means that, if you have a fully opened globe valve in a pipe and the internal diameter of the pipe is ID=0.05m, then
the equivalent length for this globe valve =300*D=300*(0.05m)=15m.
Equivalent length of 15 meters means that the globe valve generates the same pressure drop as as straight 15-meter long pipe.
Wiki User
∙ 13y ago
Wiki User
∙ 13y agoThere are charts that give "friction losses" such as a globe valve is equal to so many feet of pipe etc.
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Basic mass air flow calculation in pipe?
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