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FRICTION LOSS OF WATER PER 100 FEET OF GALVANIZED PIPE
Pipe
Size		 1/2" 3/4" 1" 1-1/4" 1-1/2"   2"
U.S.
GAL.
PER
MIN.		 LBS.
PRESS.		 HEAD
LOSS
IN
FEET		 LBS.
PRESS.		 HEAD
LOSS
IN
FEET
LBS.
PRESS.		 HEAD
LOSS
IN
FEET		 LBS.
PRESS.		 HEAD
LOSS
IN
FEET
LBS.
PRESS.		 HEAD
LOSS
IN
FEET		 LBS.
PRESS.		 HEAD
LOSS
IN
FEET
2 3.20 7.4 .82 1.9 . . . . . . . .
4 11.69 27.0 3.3 7.0 .92 2.14 .25 .57 .09 .2 . .
6 24.68 57.0 6.36 14.7 1.97 4.55 .52 1.20 .22 .5 .09 .2
8 42.42 98.0 10.82 25.0 3.37 7.8 .87 2.0 .39 .9 .13 .3
10 63.64 147.0 16.45 38.0 5.06 11.7 1.30 3.0 .61 1.4 .22 .5
12 . . 22.94 53.0 7.09 16.4 1.86 4.3 .87 2.0 .30 .7
15 . . 34.63 80.0 10.82 25.0 2.81 6.5 1.30 3.0 .43 1.0
18 . . 46.84 108.2 15.15 35.0 3.94 9.1 1.82 4.2 .61 1.4
20 . . 58.87 136.0 18.18 42.0 4.81 11.1 2.25 5.2 .78 1.8
25 . . . . 27.70 64.0 7.19 16.6 3.16 7.3 1.17 2.7
30 . . . . 38.53 89.0 9.96 23.0 4.76 11.0 1.65 3.8
35 . . . . 51.52 119.0 13.51 31.2 6.36 14.7 2.21 5.1
40 . . . . 65.80 152.0 17.32 40.0 8.14 18.8 2.86 6.6
45 . . . . . . 21.65 50.0 10.04 23.2 3.55 8.2
50 . . . . . . 25.97 60.0 12.29 28.4 4.29 9.9

 
FRICTION LOSS OF WATER PER 100 FEET OF PLASTIC PIPE
Pipe
Size		 1/2" 3/4" 1" 1-1/4" 1-1/2" 2"
U.S.
GAL.
PER
MIN.		 LBS.
PRESS.		 HEAD
LOSS
IN
FEET		 LBS.
PRESS.		 HEAD
LOSS
IN
FEET		 LBS.
PRESS.		 HEAD
LOSS
IN
FEET		 LBS.
PRESS.		 HEAD
LOSS
IN
FEET		 LBS.
PRESS.		 HEAD
LOSS
IN
FEET		 LBS.
PRESS.		 HEAD
LOSS
IN
FEET
1 .18 .43 . . . . . . . . . .
2
.66
 1.54 .18 .40 .05 .12 .07 .18 . . . .
3 1.41 3.26 .36 .84 .11 .26 .18 .42 . . . .
5 3.63 8.40 .92 2.14 .28 .66 .27 .63 .03 .09 . .
8 8.65 20.03 2.20 5.09 .68 1.58 .38 .88 .08 .20 .02 .06
10 . . 3.33 7.70 1.03 2.38 .80
1.86
 .12 .30 .03 .09
12 . . 4.32 10.00 1.44 3.34 .97 2.26 .18 .42 .10 .25
18 . . . . 3.06 7.07 1.48 3.43 .38 .88 .11 .28
20 . . . . 3.70 8.57 2.06 4.78 .46 1.07 .13 .32
25 . . . . 5.65 13.06 3.52 8.15 .69 1.60 .19 .46
30 . . . . . . 5.33 12.32 .97 2.26 .29 .67
40 . . . . . . . . 1.67 3.86 .45 1.04
50 . . . . . . . . 2.51 5.82 .74 1.73
60 . . . . . . . . 3.52 8.18 1.05 2.43
Taken from Ruth/Berry Service Manual
Last updated 11/26/2001
This information is for reference only
Not responsible for typographical errors.