Water Supply

GRAPHICAL ANALYSIS OF FLOW TEST RESULTS

Example:

Suppose a flow test yielded the following results:

• static pressure of 86 psi
• residual pressure of 42 psi
• pitot pressure of 28 psi

If the pitot reading was taken on a single stream from a 2 1/2-inch outlet with a coefficient of discharge of 0.8, the formula gives the following:

Solution:

• Q = (29.83) (Cd) (d)² (Sq. root of p)
• Q = (29.83) (0.8) (2.5)² Sq. root of 28
• Q = 789 gpm

           
INDEX Water Supply

FPT 102 - Fire Prevention and Inspection // Instructor: Kevin M. Kolb        Slide #15