Using the same information and the modified Darcy- Weisbach equation:
Hf = .031xfxLxQ,,
d5
Step 1:
Frictional factor is the same - .0216
Step 2:
Length is the same - 4000 ft
Step 3:
Q,, = 700 x 700 = 490,000
Step 4:
Figure 1-2 = 42,196
Step 5:
.031x.0216x4,000x490,000 = 1312416 = 31.102853
42,196
42,196
= 31 ft
You can see that the frictional head loss is the same using either of the
two equations.
12-16
QM 5099
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