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Pipe Sizes, Pipes, Technical Library

ASME B36.10 and B36.19 Pipe Size Charts

ASME B36.10 and B36.19 Pipe Size Charts

The ASME B36.10 and ASME B36.19 specifications cover the dimensions of seamless and welded steel pipes for high and low-temperature service, providing combinations of pipe outside and inside diameter (OD, ID), pipe thickness (WT, designated in “schedule”) and pipes theoretical weights (in pounds per foot and kilogram per meter). 

 

The two key steel pipe dimensions are the nominal pipe size (NPS) and wall thickness (WT):

  • NPS means “nominal pipe size”, which is the internal flow capacity of the pipe (pipe bore capacity). The comparable European term for “NPS” is “DN” (i.e. “Diamètre nominal”  or “Nominal diameter” and “Durchmesser Nach” in German – source: Wikipedia)
  • WT means “wall thickness”, i.e. the thickness of the pipe wall expressed in inches or millimeters. The higher the thickness of a pipe at a given NPS, the stronger the resistance of the pipe to the pressure of the fluid and its possible corrosion. The pipe thickness is called also “pipe schedule” (abbreviated, “SCH.”). For a given NPS and schedule, the thickness of the pipe is fixed and defined in the applicable ASME standard B36.10 for carbon/alloy steel and ASME B36.19 for stainless and nickel alloy pipes)

 

ASME B36.10 PIPE SIZE CHART

ASME B36.10 Pipe Size Chart – First line: wall thickness in mm; second line: pipes weight (in kilogram per meter)

NPS OD mm Sch.
5
Sch.
10
Sch.
20
Sch.
30
Sch.
40
Sch.
STD
Sch.
60
Sch.
80
Sch.
XS
Sch.
100
Sch.
120
Sch.
140
Sch.
160
Sch.
XXS
1/8 10.287 0.089
0.21
1.24
0.28
1.73
0.37
1.73
0.37
2.41
0.47
2.41
0.47
1/4 13.716 1.24
0.38
1.65
0.49
2.24
0.63
2.24
0.63
3.02
0.80
3.02
0.80
3/8 17.145 1.24
0.49
1.65
0.63
2.31
0.84
2.31
0.84
3.20
1.10
3.20
1.10
  1/2 13.716 1.65
0.80
2.11
1.00
2.77
1.62
2.77
1.62
3.73
0.80
3.73
0.80
4.78
1.95
7.47
2.55
4 26.670 1.65
1.03
2.11
1.28
2.87
1.69
2.87
1.69
3.91
2.20
3.91
2.20
5.56
2.90
7.82
3.64
1 33.401 1.65
1.30
2.77
2.09
3.38
2.50
3.38
2.50
4.55
3.24
4.55
3.24
6.35
4.24
9.09
5.45
1 1/4 42.164 1.65
1.65
2.77
2.70
3.56
3.39
3.56
3.39
4.85
4.47
4.85
4.47
6.35
5.61
9.70
7.77
1 1/2 48.260 1.65
1.91
2.77
3.11
3.68
4.05
3.68
4.05
5.08
5.41
5.08
5.41
7.14
7.25
10.15
9.56
2 60.325 1.65
2.40
2.77
3.93
3.91
5.44
3.91
5.44
5.54
7.48
5.54
7.48
8.74
11.11
11.07
13.44
2 1/2 73.025 2.11
3.69
3.05
5.26
5.16
8.63
5.16
8.63
7.01
11.41
7.01
11.41
9.53
14.92
14.02
20.39
3 88.900 2.11
4.51
3.05
6.45
3.96
8.29
4.78
9.92
5.49
11.29
5.49
11.29
7.62
15.27
7.62
15.27
11.13
21.35
15.24
27.68
3 1/2 101.600 2.11
5.18
3.05
7.40
5.74
13.57
5.74
13.57
8.08
18.63
8.80
18.63
16.15
34.20
4 114.300 2.11
5.84
3.05
8.36
4.78
12.91
5.56
14.91
6.02
16.07
6.02
16.07
7.14
18.87
8.56
22.32
8.56
22.32
11.13
28.32
13.49
33.54
17.12
41.03
5 141.300 2.77
9.47
3.40
11.57
4.78
16.09
5.56
18.61
6.55
21.77
6.55
21.77
7.14
23.62
9.53
30.97
9.53
30.97
12.70
40.28
15.88
49.11
19.05
57.43
6 168.275 2.77
11.32
3.40
13.84
4.78
19.27
6.35
25.38
7.11
28.26
7.11
28.26
9.53
37.31
10.97
42.56
10.97
42.56
12.70
48.73
14.27
54.20
18.26
67.56
21.95
79.22
8 219.075 2.77
14.78
3.76
19.96
6.35
33.31
7.04
36.81
8.18
42.55
8.18
42.55
10.31
53.08
12.70
64.64
12.70
64.64
15.09
75.92
18.26
90.44
20.62
100.27
23.01
111.27
22.23
107.92
10 273.050 3.40
22.63
4.19
27.78
6.35
41.77
7.80
51.03
9.27
60.31
9.27
60.31
12.70
81.55
15.09
96.01
12.70
81.55
18.26
114.75
21.44
133.06
25.40
155.15
28.58
172.33
25.40
155.15
12 323.850 3.96
31.25
4.57
36.00
6.35
49.73
8.38
65.20
10.31
79.73
9.53
73.88
14.27
108.96
17.48
132.08
12.70
97.46
21.44
169.91
25.40
186.97
28.58
208.14
33.32
238.76
25.40
186.97
14 355.600 3.96
34.36
6.35
54.69
7.92
67.90
9.53
81.33
11.13
94.55
9.53
81.33
15.09
126.71
19.05
158.10
12.70
107.39
23.83
194.96
27.79
224.65
31.75
253.56
35.71
281.70
16 406.400 4.19
41.56
6.35
62.64
7.92
77.83
9.53
93.27
12.70
123.30
9.53
93.27
16.66
160.12
21.44
203.53
12.70
123.30
26.19
245.66
30.96
286.64
36.53
333.19
40.49
365.35
18 457.200 4.19
46.81
6.35
70.57
7.92
87.71
11.13
122.38
14.27
155.80
9.53
105.16
19.05
205.74
23.83
254.55
12.70
139.15
29.36
309.62
34.93
363.56
39.67
408.26
45.24
459.37
20 508.000 6.35
78.55
9.53
117.15
12.70
155.12
15.09
183.42
9.53
117.15
20.62
247.83
26.19
311.17
12.70
155.12
32.54
381.53
38.10
441.49
44.45
508.11
50.01
564.81
22 558.800 6.35
86.54
9.53
129.13
12.70
171.09
9.53
129.13
22.23
294.25
28.58
373.83
12.70
171.09
34.93
451.42
41.28
527.02
47.63
600.63
53.98
672.26
24 609.600 6.35
94.53
9.53
141.12
14.27
209.64
17.48
255.41
9.53
141.12
24.61
355.26
30.96
442.08
12.70
187.06
38.89
547.71
46.02
640.03
52.37
720.15
59.54
808.22
26 660.400 6.35
102.36
7.92
127.36
9.53
152.87
10.31
165.18
12.70
202.72
14.27
227.23
28 711.200 6.35
110.34
7.92
137.32
9.53
164.85
12.70
218.69
30 762.000 6.35
118.31
7.92
147.28
12.70
234.67
15.88
292.18
9.53
176.84
10.31
191.11
11.13
206.09
12.70
234.67
32 812.800 6.35
126.31
7.92
157.24
9.53
188.82
10.31
204.08
11.13
220.08
12.70
250.64
34 863.600 6.35
134.30
7.92
167.20
9.53
200.31
10.31
217.05
11.13
234.08
12.70
266.61
36 914.400 6.35
142.13
7.92
176.96
12.70
282.27
15.88
351.70
19.05
420.42
9.53
212.56
10.31
229.76
11.13
247.31
12.70
282.27
40 1016.00 9.53
236.53
12.70
314.22
42 1066.80 7.92
207.92
9.53
248.52
12.70
330.19
48 1219.20 9.53
284.24
12.70
377.79

 

ASME B36.19 PIPE SIZE CHART

ASME B36.19 Pipe Size Chart – pipes weight (in kilogram per meter) by pipe NPS and schedule

NPS OD Schedule
5S 10S 40S 80S
(mm) (inch) PIPE WALL THICKNESS / PIPES WEIGHT
mm (in) kg/m mm (in) kg/m mm (in) kg/m mm (in) kg/m
1/8 10.3 0.405 1.25 (0.049) 0.28 1.73 (0.068) 0.37 2.42 (0.095) 0.47
1/4 13.7 0.540 1.66 (0.065) 0.49 2.24 (0.088) 0.63 3.03 (0.119) 0.80
3/8 17.2 0.675 1.66 (0.065) 0.63 2.32 (0.091) 0.85 3.20 (0.126) 1.10
1/2 21.3 0.840 1.65 (0.065) 0.81 2.11 (0.083) 1.00 2.77 (0.109) 1.27 3.74 (0.147) 1.62
3/4 26.7 1.050 1.65 (0.065) 1.02 2.11 (0.083) 1.28 2.87 (0.113) 1.68 3.92 (0.154) 2.20
1 33.4 1.315 1.65 (0.065) 1.30 2.77 (0.109) 2.09 3.38 (0.133) 2.50 4.55(0.179) 3.24
1 1/4 42.2 1.660 1.65 (0.065) 1.66 2.77 (0.109) 2.69 3.56 (0.140) 3.39 4.86 (0.191) 4.47
1 1/2 48.3 1.900 1.65 (0.065) 1.91 2.77 (0.109) 3.11 3.69 (0.145) 4.06 5.08 (0.200) 5.41
2 60.3 2.375 1.65 (0.065) 2.40 2.77 (0.109) 3.93 3.92 (0.154) 5.45 5.54 (0.218) 7.49
2 1/2 73.0 2.875 2.11 (0.083) 3.69 3.05 (0.120) 5.26 5.16 (0.203) 8.64 7.01 (0.276) 11.4
3 88.9 3.500 2.11 (0.083) 4.52 3.05 (0.120) 6.46 5.49 (0.216) 11.3 7.62 (0.300) 15.3
3 1/2 101.6 4.000 2.11 (0.083) 5.18 3.05 (0.120) 7.41 5.74 (0.226) 13.6 8.08 (0.318) 18.6
4 114.3 4.500 2.11 (0.083) 5.84 3.05 (0.120) 8.37 6.02 (0.237) 16.1 8.56 (0.337) 22.3
5 141.3 5.563 2.77 (0.109) 9.46 3.41 (0.134) 11.6 6.56 (0.258) 21.8 9.53 (0.375) 31.0
6 168.3 6.625 2.77 (0.109) 11.3 3.41 (0.134) 13.9 7.12 (0.280) 28.3 10.9 (0.432) 42.6
8 219.1 8.625 2.77 (0.109) 14.8 3.76 (0.148) 20.0 8.18 (0.322) 42.5 12.7 (0.500) 64.6
10 273.1 10.750 3.41 (0.134) 22.7 4.20 (0.165) 27.8 9.28 (0.365) 60.4 12.7 (0.500) 81.5
12 323.9 12.750 3.97 (0.156) 31.3 4.58 (0.180) 36.1 9.53 (0.375) 73.9 12.7 (0.500) 97.4

 

STEEL PIPES TOLERANCES

PIPES DIAMETER TOLERANCE

PIPE NPS/ DN/ OD Allowed Outside Diameter Tolerance
Over Under
inches mm inches mm
NPS 1/8 to 1½
DN 6 to 40
OD 10.3 to 48.3, mm
1/64 0.4 1/64 0.4
Over 1½ to 4
DN 40 to 100
OD 48.3 to 114.3, mm
1/32 0.8 1/32 0.8
Over 4 to 8
DN 100 to 200
OD 114.3 to 219.1, mm
1/16 1.6 1/32 0.8
Over 8 to 18
DN 200 to 450
OD 219.1 to 457, mm
3/32 2.4 1/32 0.8
Over 18 to 26
DN 450 to 650
OD 457 to 660, mm
1/8 3.2 1/32 0.8

 

PIPES THICKNESS TOLERANCE

PIPE NPS/ DN/ OD Tolerance, % from Nominal
Over Under
NPS 1/8 to 2½, incl, all t/D ratios
DN 6 to 65
OD 10.3 to 73.0, mm
20.0 12.5
NPS 3 to 18, incl, t/D up to 5%
DN 80 to 450
OD 88.9 to 457, mm
22.5 12.5
NPS 3 to 18, incl, t/D > 5%
DN 80 to 450
OD 88.9 to 457, mm
15.0 12.5
NPS 20 and larger, incl, welded, all t/D ratios
DN 500
OD 508, mm
17.5 12.5
NPS 20 and larger, incl, seamless, t/D up to 5%
DN 500
OD 508, mm
22.5 12.5
NPS 20 and larger, incl, seamless, t/D > 5%
DN 500
OD 508, mm
15.0 12.

 

PIPES WEIGHT TOLERANCE

The pipes’ weight tolerance depends on the nominal pipe size, as listed below:

  • Pipes NPS 12 (DN300, 323.8mm) and under, weight tolerance is: -3.5% / +10%
  • Pipes over NPS 12 (DN300, 323.8mm),weight tolerance is: -5% / +10%
  • Pipe of NPS 4 (DN100, 114.3mm) and smaller may be weighed in convenient lots; pipe in sizes larger than NPS 4 shall be weighed separately

 

PIPES QUANTITY TOLERANCE

Should be within -10% to +10% tolerance, as a rule of thumb (-3/+3% should be acceptable)

 

NPS TO DN CONVERSION

The table shows the conversion between NPS and the pipe outside diameter in inches, mm and DN (nominal diameter):

PIPE NPS Pipe outside diameter
in inches
PIpe outside diameter
in mm
NPS to DN
conversion
1/8 0.404 10.26 6
1/4 0.54 13.72 8
3/8 0.675 17.15 10
1/2 0.84 21.34 15
¾ 1.05 26.67 20
1 1.315 33.40 25
1 ¼ 1.66 42.16 32
1 ½ 1.9 48.26 40
2 2.375 60.33 50
2 ½ 2.875 73.03 65
3 3.5 88.90 80
3 ½ 4 101.60 90
4 4.5 114.30 100
4 ½ 5 127.00 115
5 5.563 141.30 125
6 6.625 168.28 150
7 7.625 193.68
8 8.625 219.08 200
10 10.75 273.05 250
12 12.75 323.85 300
14 14 355.60 350
16 16 406.40 400
18 18 457.20 450
20 20 508.00 500
22 22 558.80 550
24 24 609.60 600
26 26 660.40 650
28 28 711.20 700
30 30 762.00 750
32 32 812.80 800
34 34 863.60 850
36 36 914.40 900
38 38 965.20 950
40 40 1016.00 1000
42 42 1066.80 1050
44 44 1117.60 1100
46 46 1168.40 1150
48 48 1219.20 120

Sources:

We recommend purchasing the ASME pipe size specifications from the ASME website or from the IHS store to have a complete a proper understanding of the pipe dimensions topic.

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