Shortcut methods for determining optimum line sizing in SI units

The basic pressure-drop equation (the Darcy fonuula) for flow thi ough a pipe can be wiitten as [Pg.24]

The usual pi-actice is to work in tenns of the pressure gi-adient, wliich is the pressure drop per lineai unit of pipe. For instance, substituting L = 1 m into Eq. (1) delds [Pg.24]

The task of the piping designer is to size the line so that the flow of fluid will create a pressure gradient that is near the economical optimum. The economic optimum conditions take into account both the capital cost of equipment and operating costs of pumping, energy, etc. [Pg.24]

For any given flow, the optimum pipe diameter, dopt. will be related to optimum pressure gradient by modifying Eq, (2) so [Pg.24]

Design values for both optimum [)res,sure gradient and the velocity limit Ibi- a new petroleum refinery ui e given in the table. However, these values may be used for other chemical processing applications as well. [Pg.24]

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