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This yields two
relationships that are useful. 
Typical values of Leq/D
for common piping system components are listed in Table 1.
The equivalent length of
piping that will cause the same head loss as a particular
component can be determined
by multiplying the value of Leq/D
for that component by the diameter of the pipe. The
higher the value of Leq/D,
the longer the equivalent length of pipe.
Example: A fully-open gate valve is in a pipe with a
diameter of 10 inches. What equivalent length of
pipe would cause the same head loss as the gate valve? Solution: From Table 1, we find that the value of Leq/D
for a fully-open gate valve is 10.
By adding the equivalent lengths of all
components to the actual length of pipe in a system we
can obtain the Leq
value for the entire
piping system.
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