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" Sch-40 Steel Pipe
|
|
VEL
|
LOSS
HEAD
|
LOSS
PSI
|
| 2 |
0.74 |
0.59 |
0.26 |
| 4 |
1.48 |
2.13 |
0.92 |
| 6 |
2.22 |
4.52 |
1.96 |
| 8 |
2.97 |
7.69 |
3.33 |
| 10 |
3.71 |
11.63 |
5.04 |
| 12 |
4.45 |
16.30 |
7.06 |
| 15 |
5.56 |
24.64 |
10.67 |
| 18 |
6.67 |
34.54 |
14.96 |
| 20 |
7.42 |
41.99 |
18.18 |
| 25 |
9.27 |
63.47 |
27.48 |
| 30 |
11.12 |
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 = 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