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Copper Tubing Friction Flow Losses Pipes 1.25 to 1.50 inch dia.

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Hydraulic & Pneumatic Design Engineering

Copper Tubing Friction Flow Losses of Water in Sizes 1.25 to 1.5 inch diameter

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Tables are for Copper pipe with a surface roughness of C=130.

Nominal Size, in
1.25
Type K Tubing
Type L Tubing
Type M Tubing
Dia. 1.245 in.
Velocity, fps
Head Loss
ft/100 ft
Dia. 1.265 in.
Velocity, fps
Head Loss
ft/100 ft
Dia. 1.291 in.
Velocity, fps
Head Loss
ft/100 ft
gpm
5
1.32
0.87
1.28
1
1.23
0.73
6
1.58
1.21
1.53
1
1.47
1.02
7
1.84
1.62
1.79
1
1.72
1.35
8
2.11
2.07
2.04
2
1.96
1.73
9
2.37
2.57
2.30
2
2.21
2.16
10
2.64
3.1
2.55
3
2.45
2.62
11
2.90
3.7
2.81
3.4
2.70
3.1
12
3.16
4.4
3.06
4.1
2.94
3.7
13
3.43
5.1
3.32
4.7
3.19
4.3
14
3.69
5.8
3.57
5.4
3.43
4.9
15
3.95
6.6
3.83
6.1
3.68
5.5
20
5.27
11.3
5.11
10.4
4.90
9.4
25
6.59
17.0
6.38
15.8
6.13
14.3

 

Nominal Size, in.
1.5
Type K Tubing
Type L Tubing
Type M Tubing
Dia. 1.481 in.
Velocity, fps
Head Loss
ft/100 ft
Dia. 1.505 in.
Velocity, fps
Head Loss
ft/100 ft
Dia. 1.527 in.
Velocity, fps
Head Loss
ft/100 ft
gpm
8
1.49
0.89
1.44
0.82
1.40
0.77
9
1.68
1.11
1.62
1.02
1.58
0.95
10
1.86
1.34
1.80
1.24
1.75
1.16
11
2.05
1.60
1.98
1.48
1.93
1.38
12
2.23
1.88
2.16
1.74
2.10
1.62
13
2.42
2.18
2.34
2.02
2.28
1.88
14
2.61
2.50
2.52
2.31
2.45
2.16
15
2.79
2.84
2.71
2.63
2.63
2.45
20
3.72
4.8
3.61
4.5
3.50
4.2
25
4.66
7.3
4.51
6.8
4.38
6.3
30
5.59
10.3
5.41
9.5
5.26
8.8
35
6.52
13.6
6.31
12.6
6.13
11.7
40
7.45
17.5
7.21
16.1
7.01
15.0

 

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Source

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

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