A new equation for accurate approximation of the Moody friction factor in the general in the general gas-flow equation better approximates a wide range of Reynolds numbers than previously published equations. Other, less-accurate explicit approximations to the Moody friction factor have been widely used because they allow the gas-flow equation to be solved directly instead of iteratively. For actual computation of the best values of design variables, it is necessary to express a gas-flow equation and consequently a friction-factor equation that are valid for all practical operating conditions. The older empirical gas-flow equations have used various coefficients and exponents for friction-factor estimation. But, the new equation presented, which has been adjusted for the flow in actual pipelines, is valid for the Reynolds numbers between 5x104 and 5x107 allowing more accurate design of gas transmission pipelines. This article is the first of two that present new and simpler pipeline design approaches. The conclusion discusses a simpler correlation for predicting liquid holdup in gas condensate, two-phase flow pipelines.


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    Title :

    New approximation of friction factor developed for general gas-flow equation. Pipeline design tools - 1


    Additional title:

    Eine neue Näherung des Reibungsfaktors für die allgemeine Gasströmungsgleichung. Teil 1


    Contributors:

    Published in:

    Oil and Gas Journal ; 100 , 26 ; 62-63


    Publication date :

    2002


    Size :

    2 Seiten, 3 Tabellen, 8 Quellen



    Type of media :

    Article (Journal)


    Type of material :

    Print


    Language :

    English




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