Colebrook-White

Pipecalc 2.0, Gulf Publishing Company, Houston, Texas. Note Pipecalc 2.0 will calculate the compressibility factor, minimum pipe ID, upstream pressure, downstream pressure, and flow rate for Panhandle A, Panhandle B, Weymouth, AGA, and Colebrook-White equations. The flow rates calculated in the above sample calculations will differ slightly from those calculated with Pipecalc 2.0 since the viscosity used in the examples was extracted from Figure 5, p. 147. Pipecalc uses the Dranchuk et al. method for calculating gas compressibility. 

Where ij. is defined as the kinematic viscosity (centistokes), and is a constant with a value of 2,213.8 in USCS units and 353.68 in SI units. An empirical relation for the Fanning friction factor is the Colebrook-White equation ... 

For turbulent flow the empirical formula of Colebrook-White applies ... 

Shows a maximum derivation of -15.78% from the Colebrook-White equation for 4000 <... 

This explicit equation is consistently in good agreement with the Colebrook-White equation for 4000 < Re < 108 and 2 x 10-8 maximum deviation being -0.39%. 

Barr, D. I. H., Two Additional Methods of Direct Solution of the Colebrook-White Function, Proc. Instn, Civ. Engrs., 59, 827-835 (1975). 

Chen, J. J. J., Systematic Explicit Solutions of the Prandtl and Colebrook-White Equations for Pipe flow, Proc. Instn. Civ. Engrs, 79, 383-389 (1985). 

Colebrook-White Equation. The Colebrook-White Equation is recommended for those who are not familiar with pipeline flow equations becanse it produces the greatest consistency of accuracy over a wide range of variables. 

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