Steel Pipe Sizes and Schedules

All the piping used by CRP is dimensionally to ASME B36.1 /API 5L
The nominal bore is loosely related to the i/d of the pipe, there are different wall thicknesses or schedules available for each size, the o/d stays constant for each NB, the heavier the schedule of pipe the smaller the bore.
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Inches

NB

DN

OD (inches)

Pipe Schedule

SCH 5

SCH 10

SCH
20

SCH 30

SCH 40

SCH 60

SCH 80

SCH 100

SCH 120

SCH 160

3/4"

20

1.05

0.065

0.11

x

0.095

0.113

x

x

0.17

x

0.219

1"

25

  1.315

0.065 

 0.11

  x

 0.114

 0.133

x

 x

 0.2

x

 0.25

1.1/2"

40

 1.9

0.065

 0.11

x

0.125

0.145

x

x

 0.225

x

 0.281

2"

50

 2.375

0.065

 0.12

 x

  x

0.154

  x

x

0.25

 x

 0.344

2.1/2"

65

  2.875

0.083

 0.12

x

  x

0.203

  x

 x

 0.3

x

0.375

3"

80

  3.5

0.083

 0.12

 x

  x

0.216

 x

 x

  0.35

x

0.438 

4"

100

  4.5

0.083

 0.12

  x

  x

0.237 

x

 x

 0.437

x

 0.531

5"

125

 5.563

0.109 

0.12 

  x

  x

0.258 

x

  x

0.5

x

 0.625

6"

150

6.625

0.109

 0.13

  x

x

0.28 

 x

 x

0.562 

x

 0.719

8"

200

  8.625

0.109 

0.15

0.25

 0.277

 0.322

0.406

0.593

0.718 

0.812 

0.906

10"

250

 10.75

0.134

0.17

0.25

0.307 

 0.365

0.5

0.718

 0.843

1.0

1.125 

12"

300

12.75

0.165

0.18

0.25

0.33

0.406

0.5

0.843

1.0

1.125

1.312





































mm

NB

DN

OD (mm)

Pipe Schedule

SCH 5

SCH 10

SCH
20

SCH 30

SCH 40

SCH 60

SCH 80

SCH 100

SCH 120

SCH 160

3/4"

20

26.67 

 1.65

2.11 

x

2.41 

 2.87

x

 3.91

x

4.32 

5.56 

1"

25

 33.40

 1.65

 2.77

x

 2.90

 3.38

x

 4.55

x

 5.08

 6.35

1.1/2"

40

 48.26

 1.65

 2.77

x

 3.18

 3.68

x

 5.08

x

 5.72

 7.14

2"

50

 60.32

 1.65

 2.77

x

x

 3.91

x

 5.54

x

 6.35

 8.74

2.1/2"

65

 73.02

 2.11

 3.05

x

x

 5.16

x

 7.01

x

 7.62

 9.53

3"

80

 88.9

 2.11

 3.05

x

x

 5.49

x

 7.62

x

 8.89

 11.13

4"

100

 114.3

 2.11

 3.05

x

x

 6.02

x

 8.56

x

 11.10

 13.49

5"

125

 141.3

 5.77

 3.4

x

x

 6.55

x

 9.53

x

 12.70

 15.88

6"

150

 168.27

 2.77

 3.4

x

x

 7.11

x

 10.97

x

 14.27

18.26 

8"

200

 219.07

 2.77

 3.76

 6.35

7.04 

8.18 

 12.7

 12.70

 15.06

 18.24

 23.01

10"

250

 273.05

 3.4

 4.19

 6.35

 7.8

 9.27

 12.7

15.06 

 18.24

 21.41

 28.58

12"

300

323.85

4.19

4.57

6.35

8.38

10.31

12.7

17.45

21.41

25.40

 33.32






































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Corrosion Resistant Products Ltd
Todmorden Road
Littleborough
OL15 9EG

Phone: +44(0)1706 756400
Fax: +44(0)1706 379567
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