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. |
3/4" PVC Sch-40
|
|
VEL
|
LOSS
HEAD
|
LOSS
PSI
|
| 2 |
1.20 |
0.90 |
0.39 |
| 4 |
2.40 |
3.26 |
1.41 |
| 6 |
3.61 |
6.90 |
2.99 |
| 8 |
4.81 |
11.75 |
5.09 |
| 10 |
6.01 |
17.77 |
7.69 |
| 12 |
7.21 |
24.90 |
10.78 |
| 15 |
9.01 |
37.65 |
16.30 |
| 18 |
10.82 |
52.77 |
22.85 |
| 20 |
12.02 |
64.14 |
27.77 |
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