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" PVC Sch-40
|
|
VEL
|
LOSS
HEAD
|
LOSS
PSI
|
| 2 |
0.74 |
0.28 |
0.12 |
| 4 |
1.48 |
1.01 |
0.44 |
| 6 |
2.22 |
2.13 |
0.92 |
| 8 |
2.97 |
3.63 |
1.57 |
| 10 |
3.71 |
5.49 |
2.38 |
| 12 |
4.45 |
7.69 |
3.33 |
| 15 |
5.56 |
11.63 |
5.04 |
| 18 |
6.67 |
16.30 |
7.06 |
| 20 |
7.42 |
19.81 |
8.58 |
| 25 |
9.27 |
29.95 |
12.97 |
| 30 |
11.12 |
41.99 |
18.18 |
| 35 |
12.98 |
55.86 |
24.19 |
| 40 |
14.83 |
71.53 |
30.97 |
| 45 |
16.68 |
88.97 |
38.52 |
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 = 150 for water
at 60 degrees F. and plastic pipe.
(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