Moody Diagram
A very nice Moody Diagram that can be used to estimate friction coefficients
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The Moody friction factor - λ (or f) - is used in the Darcy-Weisbach major loss equation. The coefficient can be estimated with the diagram below:
If the flow is transient - 2300 < Re < 4000 - the flow varies between laminar and turbulent flow and the friction coefiicient is not possible to determine. The friction factor can usually be interpolated between the laminar value at Re = 2300 and the turbulent value at Re = 4000.
A very nice Moody diagram in pdf-format from Glasgow College of Nautical Studies can be found here:
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