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. |
1-1/4" Sch-40 Steel Pipe
|
|
VEL
|
LOSS
HEAD
|
LOSS
PSI
|
| 2 |
0.43 |
0.16 |
0.07 |
| 4 |
0.86 |
0.56 |
0.24 |
| 6 |
1.29 |
1.19 |
0.52 |
| 8 |
1.71 |
2.03 |
0.88 |
| 10 |
2.14 |
3.06 |
1.32 |
| 12 |
2.57 |
4.29 |
1.86 |
| 15 |
3.21 |
6.49 |
2.81 |
| 18 |
3.86 |
9.10 |
3.94 |
| 20 |
4.28 |
11.06 |
4.79 |
| 25 |
5.36 |
16.71 |
7.24 |
| 30 |
6.43 |
23.43 |
10.15 |
| 35 |
7.50 |
31.17 |
13.50 |
| 40 |
8.57 |
39.91 |
17.28 |
| 45 |
9.64 |
49.64 |
21.49 |
| 50 |
10.71 |
60.34 |
26.13 |
| 55 |
11.78 |
71.99 |
31.17 |
| 60 |
12.85 |
84.57 |
36.62 |
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