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. |
2" Sch-40 Steel Pipe
|
|
VEL
|
LOSS
HEAD
|
LOSS
PSI
|
| 4 |
0.38 |
0.08 |
0.03 |
| 6 |
0.57 |
0.17 |
0.07 |
| 8 |
0.76 |
0.28 |
0.12 |
| 10 |
0.95 |
0.43 |
0.19 |
| 12 |
1.15 |
0.60 |
0.26 |
| 15 |
1.43 |
0.91 |
0.39 |
| 18 |
1.72 |
1.27 |
0.55 |
| 20 |
1.91 |
1.55 |
0.67 |
| 25 |
2.39 |
2.34 |
1.01 |
| 30 |
2.86 |
3.28 |
1.42 |
| 35 |
3.34 |
4.37 |
1.89 |
| 40 |
3.82 |
5.59 |
2.42 |
| 45 |
4.30 |
6.95 |
3.00 |
| 50 |
4.77 |
8.45 |
3.66 |
| 55 |
5.25 |
10.08 |
4.36 |
| 60 |
5.73 |
11.84 |
5.13 |
| 65 |
6.21 |
13.74 |
5.95 |
| 70 |
6.68 |
15.76 |
6.82 |
| 75 |
7.16 |
17.91 |
7.76 |
| 80 |
7.64 |
20.18 |
9.60 |
| 85 |
8.12 |
22.58 |
9.78 |
| 90 |
8.59 |
25.10 |
10.87 |
| 95 |
9.07 |
27.74 |
12.01 |
| 100 |
9.55 |
30.51 |
13.21 |
| 110 |
10.50 |
36.40 |
15.76 |
| 120 |
11.46 |
42.76 |
18.52 |
| 130 |
12.41 |
49.59 |
21.47 |
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