By Flügge S.

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R=Reynolds number of flow, dimensionless In SI units, the above equation for f remains the same as long as the absolute roughness e and the pipe diameter D are both expressed in mm. All other terms in the equation are dimensionless. 21) that the calculation of f is not easy, since it appears on both sides of the equation. A trial-and-error approach needs to be used. 21). This will yield a second approximation for f, which can then be used to re-calculate a better value of f, by successive iteration.

Significant variation in viscosity is found when pressures are several thousand psi. In most pipeline applications, viscosity of a liquid does not change appreciably with pressure. For example, the viscosities of Alaskan North Slope (ANS) crude oil may be reported as 200 SSU at 60°F and 175 SSU at 70°F. 11) Copyright © 2004 by Marcel Dekker, Inc. 3 Use the above equations to convert the viscosity of ANS crude oil from 200 SSU to its equivalent in centistokes. 9) is not quite so direct. 9) are valid for certain ranges of SSU values, we need first to determine which of the two equations to use.

3). An example will illustrate how this is done. Some handbooks such as the Hydraulic Institute Engineering Data Book and the Flow of Fluids through Valves, Fittings and Pipes (see References) provide specific gravity versus temperature curves from which the specific gravity of most liquids can be calculated at any temperature. 736. 729. What is the specific gravity at 50°F? 0007 Copyright © 2004 by Marcel Dekker, Inc. 815 at 70°F, in equal volumes. What will be the specific gravity of the blended mixture?

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