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Friction Losses in Steel Pipes size 0.5 to 1.25 inch diameter

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Friction Losses in Steel Pipes size 0.5 to 1.25 inch diameter

Tables are for steel pipe with a surface roughness of C=100.

See also

To adjust for different surface roughness factors, use the following correction factors:

Value of C
150
140
130
120
110
100
90
80
70
60
-
0.47
0.54
0.62
0.71
0.84
1.00
1.22
1.51
1.93
2.57

 

Friction Losses in Pipe: Standard Weight Steel 1/2" Dia.
Pipe Size, in.
0.5
Pipe Dia., in.
0.622
Velocity, fps
Surface Rough C
100
hd. loss, ft/100 ft
gpm
0.5
0.53
0.6
1.0
1.06
2.1
1.5
1.58
4.4
2.0
2.11
7.6
2.5
2.64
11.4
3.0
3.17
16.0
3.5
3.70
21.3
4.0
4.22
27.3
4.5
4.75
33.9
5.0
5.28
41.2

 

Friction Losses in Pipe: Standard Weight Steel 3/4 " Dia.
Pipe Size, in.
0.75
Pipe Dia., in.
0.824
Velocity, fps
Surface Rough C
100
hd. loss, ft/100 ft
gpm
1.5
0.90
1.1
2.0
1.20
1.9
2.5
1.50
2.9
3.0
1.80
4.1
3.5
2.11
5.4
4.0
2.41
6.9
4.5
2.71
8.6
5.0
3.01
10.5
5.5
3.31
12.5
6.0
3.61
14.7

 

Friction Losses in Pipe: Standard Weight Steel 1" Dia.
Pipe Size, in.
1.0
Pipe Dia., in.
1.049
Velocity, fps
Surface Rough C
100
hd. loss, ft/100 ft
gpm
2
0.74
0.6
3
1.11
1.3
4
1.48
2.1
5
1.86
3.2
6
2.23
4.5
7
2.60
6.0
8
2.97
7.7
9
3.34
9.6
10
3.71
11.7
11
4.08
13.9
12
4.45
16.4

 

Friction Losses in Pipe: Standard Weight Steel 1 1/4" Dia.
Pipe Size, in.
1.25
Pipe Dia., in.
1.38
Velocity, fps
Surface Rough C
100
hd. loss, ft/100 ft
gpm
5
1.07
0.9
6
1.29
1.2
7
1.50
1.6
8
1.72
2.0
9
1.93
2.5
10
2.15
3.1
12
2.57
4.3
14
3.00
5.7
16
3.43
7.3
18
3.86
9.1
20
4.29
11.1

Related

Source

American Gas Association and the National Fire Protection Association. Used by permission

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