July 2008

Piping/Fluid Flow

An improved experimental correlation for Darcy friction factor

The pressure drop estimate may be on the unsafe side when using the traditional Moody chart

Cordero, G. O., Techint Engineering & Construction

Recent research has shown that the traditional formulas used in Moody's chart underestimate the friction factor in smooth pipes by as much as 2.7% at intermediate Reynolds numbers and up to 2.9% at the highest Reynolds numbers measured. Deviations reaching –2.8% are also expected in rough pipes. This small underestimate should be acceptable for most applications, but engineering companies would certainly prefer a conservative approach for all critical lines when the contract includes hydraulic guarantees. Moody's chart. Moody published his chart for finding Darcy friction factor as a function of Reynolds number and relative roughness in 1944.1 Through computerized approximations, this

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