S-MS-FrictionofWater-Pipes
Friction Of Water In Pipes
Friction head in feet per hundred feet of pipe. Velocity in feet per second. Schedule 40 pipe.
Cap.
in
GPM
Vel.
in
FPS
Frict.
Head
Feet
Cap.
in
GPM
Vel.
in
FPS
Frict.
Head
Feet
Cap.
in
GPM
Vel.
in
FPS
Frict.
Head
Feet
Cap.
in
GPM
4
6
8
10
15
20
30
40
1-INCH PIPE
1.48
2.23
2.97
3.71
5.57
7.42
11.10
14.80
1.295
2.680
4.540
6.860
14.650
25.100
54.600
95.000
1 1/4-INCH PIPE
1.073
2.150
4.290
6.440
8.580
10.700
12.900
17.200
.508
1.770
6.340
13.600
23.500
36.000
51.000
89.200
3-INCH PIPE
.651
1.300
2.170
3.250
4.340
6.510
7.600
8.680
10.850
13.000
17.500
.0762
.2620
.6620
1.3900
2.3900
5.1400
6.9000
8.9000
13.6500
19.2000
33.9000
.242
.824
2.940
6.260
10.790
23.200
40.500
62.200
.176
.370
.624
.947
1.320
2.270
4.890
6.550
8.470
13.000
18.600
.0224
.0466
.0780
.2790
.5970
1.0200
1.5600
2.2000
2.9500
3.8200
4.7900
6.4400
8.3100
1 1/2-INCH PIPE
0.788
1.580
3.150
4.730
6.300
9.460
12.600
15.800
4-INCH PIPE
1.26
1.89
2.52
3.15
3.78
5.04
7.56
8.82
10.10
12.60
15.10
8-INCH PIPE
.641
.964
1.280
2.570
3.850
5.130
6.410
7.700
8.980
10.300
11.500
13.450
15.400
5
10
20
30
40
60
80
100
50
75
100
125
150
200
300
350
400
500
600
100
150
200
400
600
800
1000
1200
1400
1600
1800
2100
2400
3000
4000
5000
6000
7000
5
10
20
30
40
50
60
80
15
30
50
75
100
150
175
200
250
300
400
.248
.868
1.820
3.100
4.670
6.590
11.400
24.700
43.100
.0587
.1223
.2040
.4330
.7360
1.1200
1.5800
2.7200
4.1600
5.8800
7.9300
11.5000
15.8000
.0074
.0542
.2910
.5000
.7600
1.0700
15200
2.0500
2.6400
3.3200
4.0600
5.1600
6.4000
2-INCH PIPE
.956
1.910
2.870
3.820
4.780
5.740
7.640
11.500
15.300
5-INCH PIPE
.802
1.200
1.600
2.410
3.210
4.010
4.810
6.410
8.020
9.620
11.200
13.600
16.000
10-INCH PIPE
.407
1.220
3.050
4.070
5.090
6.100
7.320
8.550
9.760
11.000
12.200
13.800
15.500
10
20
30
40
50
60
80
120
160
50
75
100
150
200
250
300
400
500
600
700
850
1000
100
300
750
1000
1250
1500
1800
2100
2400
2700
3000
3400
3800
15
30
50
75
100
125
150
175
200
225
2 1/2-INCH PIPE
1.01
2.01
3.35
5.03
6.70
8.38
10.05
12.45
13.40
15.05
100
150
200
250
300
350
400
500
600
750
1000
1250
1500
6-INCH PIPE
1.11
1.675
2.200
2.880
3.330
3.890
4.440
5.550
6.660
8.330
11.100
13.950
16.700
100
250
500
750
1000
1500
2000
2500
3000
3500
4000
4500
5000
5500
12-INCH PIPE
.287
.717
1.430
2.150
2.870
4.300
5.730
7.170
8.600
10.030
11.500
12.900
14.300
15.800
.0033
.0168
.0587
.1240
.2100
.4500
.7760
1.1860
1.6800
2.2500
2.9200
3.6500
4.4700
5.3800
500
750
1000
1250
1500
1750
2000
2500
14-INCH PIPE
1.19
1.78
2.37
2.97
3.56
4.15
4.74
5.93
.0370
.0777
.1310
.2000
.2810
.3750
.4830
.7380
.217
.753
1.940
4.130
7.110
10.850
15.400
20.250
26.700
33.670
.0843
.1770
.2990
.4330
.6370
.8520
1.0900
1.6600
2.3400
3.5700
6.1700
9.4800
13.5000
Vel.
in
FPS
Frict.
Head
Feet
14-INCH PIPE (Cont).
7.11
1.0400
9.48
1.81
11.90
2.78
14.20
3.95
16.60
5.32
500
750
1000
1250
1500
2000
2500
3000
4000
5000
6000
7000
8000
9000
16-INCH PIPE
.908
1.360
1.820
2.270
2.720
3.630
4.540
5.450
7.260
9.080
10.900
12.700
14.500
16.300
.0193
.0405
.0683
.1007
.1450
.2480
.3770
.5350
..9210
1.1400
2.0100
2.6900
3.4900
4.3800
750
1000
1250
1500
1750
2000
2500
3000
4000
5000
6000
7000
8000
10000
12000
18-INCH PIPE
1.08
1.43
1.79
2.16
2.37
2.87
3.59
4.30
5.74
7.17
8.61
10.00
11.50
14.30
17.20
.0228
.0386
.0585
.0819
.0970
.1390
.2110
.2970
.5110
.7810
1.1100
1.4900
1.9300
2.9700
4.2100
1000
1250
1500
1750
2000
2500
3000
4000
5000
6000
8000
10000
12000
14000
16000
20-INCH PIPE
1.15
1.56
1.74
2.03
2.31
2.89
3.46
4.62
5.77
6.92
9.23
11.50
13.80
16.20
18.50
.0227
.0399
.0480
.0637
.0812
.1230
.1740
.2980
.4550
.6450
1.1100
1.7000
2.4400
3.2900
4.2600
Note: No allowance has been made for age, differences in diameter, or any abnormal condition of interior surface.
Any factor of safety must be estimated from the local conditions and the requirements of each particular installation.
USA: St. Pauls, NC • Tel. 1-800-334-6259 • Fax 1-800-421-6772 • www.muellersteam.com
S-MS-FrictionofWater-Pipes 1020
A Watts Water Technologies Company
© 2010 Mueller Steam Specialty