10 B. Pipe Diameter using Equations 10.19 and 10.20 Back to Main
This page is used to determine the inside line diameter (d) needed for a given flow rate and pressure drop. The friction factor, f, and Reynolds number, Re, are a function of diameter and velocity terms. Therefore, the use of the correlation of f plotted against Re involves a trial and error solution if diameter is desired. A direct solution for diameter is possible by algebraic manipulation of the basic equations.
Solving
for "d" yields
For
small pipe, (10.19)
For
large pipe, (10.20)
Where: d =
diameter
q = volumetric flow rate
r =
density
m =
viscosity
L = length of line
= mass/force conversion constant
= Frictional pressure drop
The
units are defined as those listed on page 321.
To carry out the inside diameter calculation the Liquid viscosity,
Liquid density, Pipe length, Flow rate, and Friction pressure loss of the fluid
must be entered into their entry space. To do so use the mouse to click the curser
in their entry space and input the data. Once this has been done, select Run to execute the solution.