Nominal and Metric Pipe Size Chart

Wall thickness of pipes available in different standard schedules (SCH.) for NPS (Nominal Pipe Size in “inch”) as well as DN (Diameter Nominal in “mm”) are shown in below chart.

The wall thickness unit shown in the table without bracket is in metric system i.e., millimetres (mm)  , the British equivalents dimensional conversion i.e., inch is shown in bracket.

The chart is in compliance with ANSI B36.10M and API 5L.

 

Table 1: Wall Thickness Table for Standard Pipe Sizes from Schedule 5 to XS

 Nominal Pipe Size

( NPS )

in inch

 Diameter Nominal (DN)
in mm

 

OD

in mm (inch.)

Wall Thickness in mm (inch.)
SCH. 5S SCH. 5 SCH. 10S SCH. 10 SCH. 20 SCH. 30 SCH. 40 SCH. 40S & Std. SCH. 60 SCH. 80 SCH. 80S & E.H XS
1/8 6  10.26 (0.404) 0.889 (0.035)  0.889 (0.035) 1.254 (0.049)  1.254 (0.049)  NA 1.448 (0.057) 1.727 (0.068)  1.727 (0.068) NA  2.413 (0.095)  2.413 (0.095) 2.413 (0.095)
 1/4 8 13.72 (0.540) 1.245 (0.049)  1.245 (0.049)  1.651 (0.065)   1.651 (0.065)  NA 1.854 (0.073) 2.235 (0.088)  2.235 (0.088) NA  3.023 (0.119)  3.023 (0.119)  3.023 (0.119)
 3/8 10  17.15 (0.675) 1.245 (0.049)  1.245 (0.049)  1.651 (0.065)  1.651 (0.065)  NA 1.854 (0.073) 2.311 (0.091)  2.311 (0.091) NA 3.200 (0.126)  3.200 (0.126) 3.200 (0.126)
 1/2 15 21.34 (0.840) 1.651 (0.065)  1.651 (0.065)  2.108 (0.083)   2.108 (0.083)  NA 2.413 (0.095) 2.769 (0.109)  2.769 (0.109) NA 3.734 (0.147) 3.734 (0.147) 3.734 (0.147)
 3/4 20 26.67 (1.050)  1.651 (0.065)   1.651 (0.065)  2.108 (0.083)    2.108 (0.083)  NA  2.413 (0.095)  2.870 (0.113)   2.870 (0.113) NA  3.912 (0.154) 3.912 (0.154) 3.912 (0.154)
 1 25 33.40 (1.315) 1.651 (0.065)  1.651 (0.065) 2.769 (0.109)  2.769 (0.109)  NA 2.896 (0.114) 3.378 (0.133)  3.378 (0.133) NA  4.547 (0.179)   4.547 (0.179)  4.547 (0.179)
 1.25 32 42.16 (1.660)  1.651 (0.065)  1.651 (0.065) 2.769 (0.109)   2.769 (0.109)  NA 2.972 (0.117) 3.556 (0.140)  3.556 (0.140) NA  4.851 (0.191)   4.851 (0.191)   4.851 (0.191)
 1.5 40 48.26 (1.900)   1.651 (0.065)   1.651 (0.065)  2.769 (0.109)    2.769 (0.109)  NA  3.175 (0.125) 3.683 (0.145)  3.683 (0.145) NA  5.080 (0.200)   5.080 (0.200)   5.080 (0.200)
 2 50 60.33 (2.375) 1.651 (0.065)  1.651 (0.065)   2.769 (0.109)   2.769 (0.109)  NA  3.175 (0.125)  3.912 (0.154)   3.912 (0.154) NA 5.537 (0.218) 5.537 (0.218) 5.537 (0.218)
 2.5 65 73.03 (2.875) 2.108 (0.083) 2.108 (0.083) 3.048 (0.120) 3.048 (0.120)  NA 4.775 (0.188) 5.156 (0.203)  5.156 (0.203) NA 7.010 (0.276) 7.010 (0.276) 7.010 (0.276)
 3 80 88.90 (3.500) 2.108 (0.083)  2.108 (0.083) 3.048 (0.120) 3.048 (0.120) NA 4.775 (0.188) 5.486 (0.216) 5.486 (0.216) NA 7.620 (0.300)  7.620 (0.300)  7.620 (0.300)
 3.5 90 101.60 (4.000)  2.108 (0.083)  2.108 (0.083) 3.048 (0.120)  3.048 (0.120)  NA 4.775 (0.188)  5.740 (0.226)  5.740 (0.226) NA   9.677 (0.381)   9.677 (0.381)  9.677 (0.381)
 4 100 114.30 (4.500) 2.108 (0.083)  2.108 (0.083)  3.048 (0.120)  3.048 (0.120)  NA 4.775 (0.188) 6.020 (0.237)  6.020 (0.237)  7.137 (0.2810 8.560 (0.337)  8.560 (0.337)  8.560 (0.337)
 4.5 115 127.00 (5.000) NA NA NA NA NA NA 6.274 (0.247)  6.274 (0.247)  NA 9.017 (0.355)  9.017 (0.355)  9.017 (0.355)
 5 125 141.30 (5.563) 2.769 (0.109) 2.769 (0.109)  3.404 (0.134)   3.404 (0.134)  NA NA 6.553 (0.258)  6.553 (0.258) NA 9.525 (0.375)  9.525 (0.375)  9.525 (0.375)
NPS
in inch
DN
in mm

OD

in mm (inch.)

SCH. 5S  SCH. 5  SCH. 10S  SCH. 10 SCH. 20  SCH. 30  SCH. 40  SCH. 40S & Std.  SCH. 60 SCH. 80  SCH. 80S & E.H XS
 6 150 168.28 (6.625) 2.769 (0.109) 2.769 (0.109)  3.404 (0.134)   3.404 (0.134)  NA NA 7.112 (0.280)  7.112 (0.280)  NA 10.973 (0.432)  10.973 (0.432)  10.973 (0.432)
 7 175 193.7 (7.625) NA NA NA NA NA NA 7.65 (0.301) 7.65 (0.301)  NA 12.70 (0.500)  12.70 (0.500)  12.70 (0.500)
 8 200 219.08 (8.625) 2.77 (0.109)  2.77 (0.109)  3.76 (0.148)   3.76 (0.148)  6.35 (0.250) 7.04 (0.277) 8.18 (0.322)  8.18 (0.322)  10.31 (0.406) 12.70 (0.500)  12.70 (0.500)  12.70 (0.500)
 9 225 244.48 (9.625) NA NA NA NA NA NA 8.69 (0.342)  8.69 (0.342)  NA  12.70 (0.500)  12.70 (0.500)  12.70 (0.500)
 10 250 273.05 (10.750) 3.40 (0.134)  3.40 (0.134)  4.19 (0.165)   4.19 (0.165)  6.35 (0.250) 7.99 (0.307) 9.27 (0.365)  9.27 (0.365)  12.70 (0.500) 15.06 (0.593)   12.70 (0.500)   12.70 (0.500)
11 275  298.50 (11.750)  NA NA NA NA NA NA 9.53 (0.375)  9.53 (0.375)  NA   12.70 (0.500)   12.70 (0.500)   12.70 (0.500)
 12 300 323.85 (12.75) 3.96 (0.156) 4.19 (0.165) 4.57 (0.180)  4.57 (0.180)   6.35 (0.250)  8.38 (0.330) 10.31 (0.406)  9.53 (0.375)  14.27 (0.562) 17.45 (0.687)   12.70 (0.500)    12.70 (0.500)
 14 350 355.60 (14.00) 3.96 (0.156)  3.96 (0.156)  4.77 (0.188)  6.35 (0.250) 7.92 (0.312) 9.52 (0.375) 11.10 (0.437)   9.53 (0.375) 15.06 (0.593) 19.05 (0.750)   12.70 (0.500)    12.70 (0.500)
NPS
in inch
DN
in mm

OD

in mm (inch.)

SCH. 5S  SCH. 5  SCH. 10S  SCH. 10 SCH. 20  SCH. 30  SCH. 40  SCH. 40S & Std.  SCH. 60 SCH. 80  SCH. 80S & E.H XS
 16 400  406.40 (16.00) 4.19 (0.165)  4.19 (0.165)   4.77 (0.188)   6.35 (0.250)  7.92 (0.312) 9.52 (0.375)  12.70 (0.500)  9.52 (0.375) 16.66 (0.656) 21.412 (0.843)  12.70 (0.500)   12.70 (0.500)
 18 450 457.20 (18.00) 4.91 (0.165)  4.91 (0.165)    4.77 (0.188)    6.35 (0.250)   7.92 (0.312)  11.10 (0.437) 14.27 (0.562)   9.52 (0.375)  19.05 (0.750) 23.80 (0.937)  12.70 (0.500)    12.70 (0.500)
 20 500 508.00 (20.00) 4.77 (0.188)  4.77 (0.188)  5.54 (0.218) 6.35 (0.250) 9.52 (0.375)  12.70 (0.500)  15.06 (0.593) 9.52 (0.375) 20.62 (0.812) 26.19 (1.031)  12.70 (0.500)    12.70 (0.500)
 22 550 558.80 (22.00)  4.77 (0.188)  4.77 (0.188)   5.54 (0.218) 6.35 (0.250)  9.52 (0.375)   12.70 (0.500) NA  9.52 (0.375)  22.22 (0.875) 28.57 (1.125)   12.70 (0.500)   12.70 (0.500)
 24 600 609.60 (24.00) 5.54 (0.218)  5.54 (0.218)  6.35 (0.250)   6.35 (0.250)   9.52 (0.375)  14.27 (0.562) 17.45 (0.687)  9.52 (0.375) 24.59 (0.968)  30.94 (1.218)    12.70 (0.500)    12.70 (0.500)
 26 650 660 (26.00) NA NA NA  7.92 (0.312) 12.70 (0.500) NA  NA   9.52 (0.375) NA NA  12.70 (0.500)   12.70 (0.500)
 28 700 711 (28.00) NA NA NA   7.92 (0.312) 12.70 (0.500)  15.88 (0.625)  NA   9.52 (0.375)  NA NA  12.70 (0.500)   12.70 (0.500)
 30 750 762 (30.00)  NA NA NA    7.92 (0.312)  12.70 (0.500)   15.88 (0.625)  NA   9.52 (0.375)  NA NA  12.70 (0.500)  12.70 (0.500)
NPS
in inch
DN
in mm

OD

in mm (inch.)

SCH. 5S  SCH. 5  SCH. 10S  SCH. 10 SCH. 20  SCH. 30  SCH. 40  SCH. Std.  SCH. 60 SCH. 80  SCH. 80S & E.H XS
 32 800 813 (32.00) NA NA NA    7.92 (0.312)   12.70 (0.500)   15.88 (0.625)  17.48 (0.688)   9.52 (0.375) NA NA NA   12.70 (0.500)
 34 850 864 (34.00)  NA NA NA     7.92 (0.312)   12.70 (0.500) 15.88 (0.625)   17.48 (0.688)   9.52 (0.375) NA NA NA    12.70 (0.500)
 36 900 914 (36.00) NA NA NA     7.92 (0.312)  NA 15.88 (0.625) 19.05 (0.750)   9.52 (0.375) NA NA NA    12.70 (0.500)
 42 1050  1067 (42.00) NA NA NA  NA NA NA NA   9.52 (0.375) NA NA NA    12.70 (0.500)
 48 1200 1219 (48.00)  NA NA NA NA NA NA NA   9.52 (0.375) NA NA NA   12.70 (0.500)

 

Abbreviations:

STD. – Standard Weight

XS – Extra strong

XXS – Double Extra-Strong

 

 

Table 2: Wall Thickness Table for Standard Pipe Sizes from Schedule 100 to XXS
 NPS
in inch
DN
in mm

OD

in mm (inch.)

Wall Thickness for Pipe from Schedule 100  to  XXS

 in mm (inch.)

SCH. 100  SCH. 120
 SCH. 140
 SCH. 160 XXS
1/8 6  10.26 (0.404) NA NA NA NA NA
 1/4 8 13.72 (0.540) NA NA NA NA NA
 3/8 10  17.15 (0.675) NA NA NA NA NA
 1/2 15 21.34 (0.840) NA NA NA 4.77 (0.188) 7.47 (0.294)
 3/4 20 26.67 (1.050) NA NA NA 5.56 (0.219) 7.82 (0.308)
 1 25 33.40 (1.315) NA NA NA 6.35 (0.250) 9.09 (0.358)
 1.25 32 42.16 (1.660) NA NA NA 6.35 (0.250) 9.70 (0.382)
 1.5 40 48.26 (1.900) NA NA NA 7.14 (0.281) 10.16 (0.400)
 2 50 60.33 (2.375) NA 6.35 (0.250) NA 8.71 (0.343) 11.07 (0.436)
 2.5 65 73.03 (2.875) NA 7.62 (0.300) NA 9.52 (0.375) 14.02 (0.552)
 3 80 88.90 (3.500) NA 8.89 (0.350) NA 11.12 (0.438) 15.24 (0.600)
 3.5 90 101.60 (4.000) NA NA NA NA 16.15 (0.636)
 4 100 114.30 (4.500) NA 11.10 (0.437) NA 13.49 (0.531) 17.12 (0.674)
 4.5 115 127.00 (5.000) NA NA NA NA 18.03 (0.710)
 5 125 141.30 (5.563) NA 12.70 (0.500) NA 15.87 (0.625) 19.05 (0.750)
NPS
in inch
DN
in mm

OD

in mm (inch.)

SCH. 100  SCH. 120
 SCH. 140  SCH. 160 XXS
 6 150 168.28 (6.625) NA 14.27 (0.562) NA 18.26 (0.719) 21.95 (0.864)
 7 175 193.7 (7.625) NA NA NA NA 22.22 (0.875)
 8 200 219.08 (8.625) 15.06 (0.593) 18.26 (0.719) 20.62 (0.812) 23.01 (0.906) 22.22 (0.875)
 9 225 244.48 (9.625) NA NA NA NA NA
 10 250 273.05 (10.750) 18.24 (0.718) 21.41 (0.843) 25.40 (1.000) 28.57 (1.125) NA
11 275  298.50 (11.750)
 12 300 323.85 (12.75) 21.41 (0.843) 25.40 (1.000) 28.57 (1.125) 33.32 (1.312) NA
 14 350 355.60 (14.00) 23.80 (0.937) 27.76 (1.093) 31.75 (1.25) 35.71 (1.406) NA
NPS
in inch
DN
in mm

OD

in mm (inch.)

SCH. 100  SCH. 120
 SCH. 140  SCH. 160 XXS
 16 400  406.40 (16.00) 26.19 (1.031) 30.94 (1.218) 36.50 (1.437) 40.46 (1.593) NA
 18 450 457.20 (18.00) 29.36 (1.156) 34.92 (1.375) 39.67 (1.562) 45.24 (1.781) NA
 20 500 508.00 (20.00) 32.51 (1.280) 38.10 (1.500) 44.45 (1.750) 49.99 (1.968) NA
 22 550 558.80 (22.00) 34.92 (1.375) 41.27 (1.625) 47.62 (1.875) 53.97 (2.125) NA
 24 600 609.60 (24.00) 38.89 (1.531) 46.02 (1.812) 52.37 (2.062) 59.51 (2.343) NA
 26 650 660 (26.00)  NA NA NA NA NA
 28 700 711 (28.00)  NA NA NA NA NA
 30 750 762 (30.00)  NA NA NA NA NA
NPS
in inch
DN
in mm

OD

in mm (inch.)

SCH. 5S  SCH. 5  SCH. 10S  SCH. 10 SCH. 20
 32 800 813 (32.00)  NA NA NA NA NA
 34 850 864 (34.00) NA NA NA NA NA
 36 900 914 (36.00)  NA NA NA NA NA
 42 1050  1067 (42.00)  NA NA NA NA NA
 48 1200 1219 (48.00)  NA NA NA NA NA
Standard Pipe Size Table
Standard Pipe Size

 

Image source: Wiki

Apart from the wall thickness, other pipe sizing parameters such as outer diameter of standard size pipes and NPS to DN conversion is also shown in the above tables.

The NPS system is American designation of pipes and DN is the European counterpart of it.

Another older designation called Iron Pipe Size (IPS) is equivalent to the NPS designation.

Nominal Bore (NB) is another equivalent designation of NPS.

The standard pipe dimension tables shown above are valid for most of the pipe materials including the pipes made up of wrought iron, wrought steel, stainless steel, polyvinyl chloride (PVC) and CPVC.

 

Leave a Reply

Your email address will not be published. Required fields are marked *