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TECHNICAL NOTES
FRICTION LOSS IN SCHEDULE 80 SYSTEMS
 
  • Data shown is calculated from WIlliams and Hazen formula: H=(3.023/C1.852)(V1.852/D1.167) using C-150. For water at 60°F. Where H = head loss, V = fluid velocity ft./sec., D = diameter of pipe, ft. C = coefficient representing roughness of pipe interiour surface.
  • Fittings Table: all measurements are in equivalent feet of pipe.
  • Piping Table: velocity measured in feet/second, friction loss measured in feet of water head per 100 feet of pipe.
 
FRICTION LOSS IN SCHEDULE 80 FITTINGS

Nominal Pipe Size, In.

3/8"

1/2"

3/4"

1"

1-1/4"

1-1/2"

2"

2-1/2"

3"

3-1/2"

4"

5"

6"

8"

Tee, Side Outlet
3
4
5
6
7
8
12
15
16
20
22
28
32
38

90 Ell
1-1/2
1-1/2
2
2-3/4
4
4
6
8
8
10
12
14
18
22

45 Ell
3/4
3/4
1
1-3/8
1-3/4
2
2-1/2
3
4
4-1/2
5
6
8
10

Insert Coupling
—
1/2
3/4
1
1-1/4
1-1/2
2
3
3
—
4
—
6-1/4
—

Male/Female Insert Adapters
—
1
1-1/2
2
2-3/4
3-1/2
4-1/2
—
6-1/2
—
9
—
14
—

All measurements are in equivalent feet of pipe.
 
FRICTION LOSS IN SCHEDULE 80 PIPE

GALS.
PER
MIN.

1/2"

3/4"

1"

1-1/4"

1-1/2"

2"

Vel

Loss

Vel

Loss

Vel

Loss

Vel

Loss

Vel

Loss

Vel

Loss

2
2.74
6.72
1.48
1.51
       

4
5.48
24.2
2.97
5.45
1.79
1.54
1.00
0.39
0.73
.177
 

6
8.23
51.2
4.45
11.50
2.68
3.34
1.50
0.82
1.09
.375
.650
.107

8
11.00
86.9
5.94
19.60
3.57
5.69
2.00
1.39
1.45
.640
.870
.183

10
13.70
132
7.42
29.60
4.46
8.60
2.50
2.10
1.82
.960
1.09
.276

12

  
8.91
41.5
5.36
12.0
3.00
2.94
2.18
1.35
1.30
.387

15

  
11.1
62.7
6.70
22.9
3.76
4.45
2.72
2.04
1.63
.585

18

  
13.4
87.9
8.03
25.5
4.50
6.25
3.27
2.86
1.96
.818

20

  
14.8
107
8.92
30.9
5.00
7.57
3.63
3.47
2.17
.996

25

    
11.20
58.8
6.25
11.4
4.55
5.25
2.71
1.51

30

    
13.40
65.3
7.50
16.0
5.45
7.38
3.26
2.11

35

    
15.60
86.9
8.75
21.3
6.38
9.78
3.80
2.81

40

    
17.9
111
10.0
27.3
7.26
12.5
4.35
3.59

45

      
11.2
33.9
8.26
15.6
4.89
4.46

50

      
12.5
41.3
9.08
18.9
5.43
5.41

55

      
13.7
49.2
10.0
22.0
5.98
6.44

60

      
15.0
57.8
10.9
26.5
6.52
7.61

65

      
16.1
67.0
11.8
30.7
7.06
8.84

70

      
17.5
77.1
12.7
35.3
7.61
10.1

75

      
18.8
87.4
13.6
40.1
8.15
11.5

80

      
20.0
98.2
14.5
45.2
8.69
12.9

85

      
21.2
110
15.4
50.3
9.03
14.5

90

      
22.5
122
16.3
55.9
9.78
16.1

95

        
17.2
62.0
10.3
17.8

100

        
18.2
68.2
10.9
19.6

110

        
20.0
81.3
12.0
23.4

120

        
21.8
95.4
13.0
27.4

130

        
23.6
111
14.1
31.8

140

        
25.4
127
15.2
36.5

150

          
16.3
41.5

160

          
17.4
46.7

170

          
18.5
52.2

180

          
19.6
58.3

190

          
20.6
64.4

200

          
21.7
70.5

220

          
23.9
84.1

240

          
26.1
98.7

260

          
28.3
115
 

GALS.
PER
MIN.

2-1/2"

3"

3-1/2"

4"

5"

6"

8"

Vel

Loss

Vel

Loss

Vel

Loss

Vel

Loss

Vel

Loss

Vel

Loss

Vel

Loss

8
0.61
.077
           

10
0.76
.115
.485
.039
         

12
0.91
.161
.572
.055
         

15
1.14
.243
.727
.083
.54
.035
       

18
1.36
.340
.873
.116
.65
.056
       

20
1.51
.414
.970
.140
0.72
.068
.560
.037
     

25
1.90
.625
1.21
.212
0.90
.103
.695
.055
     

30
2.27
.874
1.44
.297
1.08
.145
.840
.077
0.53
.025
   

35
2.65
1.16
1.70
.396
1.26
.192
.973
.103
0.62
.034
   

40
3.03
1.49
1.94
.507
1.44
.246
1.12
.132
.710
.043
   

45
3.41
1.86
2.18
.629
<
1.63