Hydraulics and Fluid Mechanics in ME
A compound pipe is required to be replaced by a new pipe. The two pipes are said to be equivalent, if

Length of both the pipes is same
Loss of head and discharge of both the pipes is same
Loss of head and velocity of flow in both the pipes is same
Diameter of both the pipes is same

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Hydraulics and Fluid Mechanics in ME
Stanton diagram is a

log-log plot of friction factor against Reynolds number
semi-log plot of friction factor against relative roughness
log-log plot of relative roughness against Reynolds number
semi-log plot of friction factor against Reynolds number

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