Law Supply, Inc.
Web Page - Friction
Loss Chart
Velocity in Ft./SEC.
Fiction Head Loss in feet of water per 100ft. of pipe
| Gals. Per Min. |
1-1/2" Sch-40 Steel Pipe
|
|
VEL
|
LOSS
HEAD
|
LOSS
PSI
|
| 2 |
0.13 |
0.07 |
0.03 |
| 4 |
0.63 |
0.27 |
0.12 |
| 6 |
0.94 |
0.56 |
0.24 |
| 8 |
1.26 |
0.96 |
.42 |
| 10 |
1.57 |
1.45 |
0.63 |
| 12 |
1.89 |
2.03 |
0.88 |
| 15 |
2.36 |
3.07 |
1.33 |
| 18 |
2.83 |
4.30 |
1.86 |
| 20 |
3.15 |
5.22 |
2.26 |
| 25 |
3.94 |
7.89 |
3.42 |
| 30 |
4.72 |
11.07 |
4.79 |
| 35 |
5.51 |
14.72 |
6.37 |
| 40 |
6.30 |
18.85 |
8.16 |
| 45 |
7.08 |
23.45 |
10.15 |
| 50 |
7.87 |
28.50 |
12.34 |
| 55 |
8.66 |
34.00 |
14.72 |
| 60 |
9.44 |
39.95 |
17.30 |
| 65 |
10.23 |
46.33 |
20.06 |
| 70 |
11.02 |
53.15 |
23.01 |
| 75 |
11.81 |
60.39 |
26.15 |
| 80 |
12.59 |
68.06 |
29.47 |
LBS. per square in. = Head in
ft. x .433
Head in ft. = lbs. per sq.
in. x 2.31'
The velocity of two (2)
feet per second is generally accepted as the velocity ot carry solids.
Data shown is
calculated form Williams and Hazen formula:
H = 1043.94
X ((Q^1.852) / ((C^1.852 X D^4.8655)))
USING: C = 100 for water
at 60 degrees F.
(coefficient for roughness of the interior pipe surface)
H = head loss in FT.
V = fluid velocity in FT/SEC.
D = inside diameter of the pipe in INCHES.
Q = flow rate GPM
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Last updated 05/19/2003