Applications:

Equivalent length method is widely used in water supply and other engineering calculations. The minor losses of pipe fittings, appurtenances and valves can be converted to friction loss over an "equivalent length", and thus simplifies the calculation procedure.

However, there are limitations. For example, most backflow preventers, including reduced pressure zone type and double check type, do not follow the exponential rule as Hazen-Williams formula expressed. You may consult the Resistance coefficients of pipe fittings issued by Hydraulic Institute, and/or manufacturer's product specifications.

Pipe Data

Inner Diameters & Equivalent Lengths

Inner Diameters (mm) & Equivalent Lengths (m)
Select Pipe	Select Dn	Di	E	F	T	R	CV	AV	BV	GV

How to Use:

Select a pipe schedule/material in the first dropdown menu.
Select a nominal diameter, Dn, (in inch) in the second dropdown menu.
The inner diameter and the equivalent length of fittings and valves for that size will be shown under each header.
Note: The data shown are for reference only. The inner diameter may be different from the official pipe schedules. The equivalent lengths may vary even more from source to source. If the accuracy is your main concern, you should consult official standards or manufacturer's product data.

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