ASME PIPE SIZE CHART


ASME B36.10 and ASME B36.19 pipe size chart show standard and incremental combinations of internal diameters and wall thicknesses for carbon and stainless steel pipes. The ASME pipe size charts show also a theoric weight for each combination NPS/Schedule (pounds per foot and kilogram per meter); the actual weight of pipes may actually differ from the theoric values.


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).

Pipe size chart: outside diameter, inside diameter, wall thickness

 

 

 

 

 

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

 


PIPE SIZE CHART – TOLERANCES

OUTSIDE 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

WALL 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).