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Nominal Pipe Size

NPS ⅛ to NPS 3½

NPS^[5]	DN ^[2]	OD [in (mm)]	Wall thickness [in (mm)]
NPS^[5]	DN ^[2]	OD [in (mm)]	SCH 5	SCH 10s/10	SCH 30	SCH 40s/40 /STD	SCH 80s/80 /XS	SCH 120	SCH 160	XXS
⅛	6	0.405 (10.29)	0.035 (0.889)	0.049 (1.245)	0.057 (1.448)	0.068 (1.727)	0.095 (2.413)	—	—	—
¼	8	0.540 (13.72)	0.049 (1.245)	0.065 (1.651)	0.073 (1.854)	0.088 (2.235)	0.119 (3.023)	—	—	—
⅜	10	0.675 (17.15)	0.049 (1.245)	0.065 (1.651)	0.073 (1.854)	0.091 (2.311)	0.126 (3.200)	—	—	—
½	15	0.840 (21.34)	0.065 (1.651)	0.083 (2.108)	0.095 (2.413)	0.109 (2.769)	0.147 (3.734)	—	0.188 (4.775)	0.294 (7.468)
¾	20	1.050 (26.67)	0.065 (1.651)	0.083 (2.108)	0.095 (2.413)	0.113 (2.870)	0.154 (3.912)	—	0.219 (5.563)	0.308 (7.823)
1	25	1.315 (33.40)	0.065 (1.651)	0.109 (2.769)	0.114 (2.896)	0.133 (3.378)	0.179 (4.547)	—	0.250 (6.350)	0.358 (9.093)
1¼	32	1.660 (42.16)	0.065 (1.651)	0.109 (2.769)	0.117 (2.972)	0.140 (3.556)	0.191 (4.851)	—	0.250 (6.350)	0.382 (9.703)
1½	40	1.900 (48.26)	0.065 (1.651)	0.109 (2.769)	0.125 (3.175)	0.145 (3.683)	0.200 (5.080)	—	0.281 (7.137)	0.400 (10.160)
2	50	2.375 (60.33)	0.065 (1.651)	0.109 (2.769)	0.125 (3.175)	0.154 (3.912)	0.218 (5.537)	0.250 (6.350)	0.343 (8.712)	0.436 (11.074)
2½	65	2.875 (73.03)	0.083 (2.108)	0.120 (3.048)	0.188 (4.775)	0.203 (5.156)	0.276 (7.010)	0.300 (7.620)	0.375 (9.525)	0.552 (14.021)
3	80	3.500 (88.90)	0.083 (2.108)	0.120 (3.048)	0.188 (4.775)	0.216 (5.486)	0.300 (7.620)	0.350 (8.890)	0.438 (11.125)	0.600 (15.240)
3½	90	4.000 (101.60)	0.083 (2.108)	0.120 (3.048)	0.188 (4.775)	0.226 (5.740)	0.318 (8.077)	—	—	0.636 (16.154)

NPS 4 to NPS 9

NPS^[5]	DN ^[2]	OD [in (mm)]	Wall thickness [in (mm)]
NPS^[5]	DN ^[2]	OD [in (mm)]	SCH 5	SCH 10s/10	SCH 20	SCH 30	SCH 40s/40 /STD	SCH 60	SCH 80s/80 /XS	SCH 100	SCH 120	SCH 140	SCH 160	XXS^[5]
4	100	4.500 (114.30)	0.083 (2.108)	0.120 (3.048)	—	0.188 (4.775)	0.237 (6.020)	0.281 (7.137)	0.337 (8.560)	0.437 (11.100)	—	—	0.531 (13.487)	0.674 (17.120)
4½	115	5.000 (127.00)	—	—	—	—	0.247 (6.274)	—	0.355 (9.017)	—	—	—	—	0.710 (18.034)
5	125	5.563 (141.30)	0.109 (2.769)	0.134 (3.404)	—	—	0.258 (6.553)	—	0.375 (9.525)	—	0.500 (12.700)	—	0.625 (15.875)	0.750 (19.050)
6	150	6.625 (168.28)	0.109 (2.769)	0.134 (3.404)	—	—	0.280 (7.112)	—	0.432 (10.973)	—	0.562 (14.275)	—	0.719 (18.263)	0.864 (21.946)
7^[5]	—	7.625 (193.68)	—	—	—	—	0.301 (7.645)	—	0.500 (12.700)	—	—	—	—	0.875 (22.225)
8	200	8.625 (219.08)	0.109 (2.769)	0.148 (3.759)	0.250 (6.350)	0.277 (7.036)	0.322 (8.179)	0.406 (10.312)	0.500 (12.700)	0.593 (15.062)	0.718 (18.237)	0.812 (20.625)	0.906 (23.012)	0.875 (22.225)
9^[5]	—	9.625 (244.48)	—	—	—	—	0.342 (8.687)	—	0.500 (12.700)	—	—	—	—	—

[edit]NPS 10 to NPS 24

NPS^[5]	DN ^[2]	OD [in (mm)]	Wall thickness [in (mm)]
NPS^[5]	DN ^[2]	OD [in (mm)]	SCH 5s	SCH 5	SCH 10s	SCH 10	SCH 20	SCH 30	SCH 40s/STD
10	250	10.75 (273.05)	0.134 (3.404)	0.134 (3.404)	0.165 (4.191)	0.165 (4.191)	0.250 (6.350)	0.307 (7.798)	0.365 (9.271)
12	300	12.75 (323.85)	0.156 (3.962)	0.165 (4.191)	0.180 (4.572)	0.180 (4.572)	0.250 (6.350)	0.330 (8.382)	0.375 (9.525)
14	350	14.00 (355.60)	0.156 (3.962)	0.156 (3.962)	0.188 (4.775)	0.250 (6.350)	0.312 (7.925)	0.375 (9.525)	0.375 (9.525)
16	400	16.00 (406.40)	0.165 (4.191)	0.165 (4.191)	0.188 (4.775)	0.250 (6.350)	0.312 (7.925)	0.375 (9.525)	0.375 (9.525)
18	450	18.00 (457.20)	0.165 (4.191)	0.165 (4.191)	0.188 (4.775)	0.250 (6.350)	0.312 (7.925)	0.437 (11.100)	0.375 (9.525)
20	500	20.00 (508.00)	0.188 (4.775)	0.188 (4.775)	0.218 (5.537)	0.250 (6.350)	0.375 (9.525)	0.500 (12.700)	0.375 (9.525)
24	600	24.00 (609.60)	0.218 (5.537)	0.218 (5.537)	0.250 (6.350)	0.250 (6.350)	0.375 (9.525)	0.562 (14.275)	0.375 (9.525)

NPS^[5]	Wall thickness [in (mm)]
NPS^[5]	SCH 40	SCH 60	SCH 80s/XS	SCH 80	SCH 100	SCH 120	SCH 140	SCH 160
10	0.365 (9.271)	0.500 (12.700)	0.500 (12.700)	0.593 (15.062)	0.718 (18.237)	0.843 (21.412)	1.000 (25.400)	1.125 (28.575)
12	0.406 (10.312)	0.562 (14.275)	0.500 (12.700)	0.687 (17.450)	0.843 (21.412)	1.000 (25.400)	1.125 (28.575)	1.312 (33.325)
14	0.437 (11.100)	0.593 (15.062)	0.500 (12.700)	0.750 (19.050)	0.937 (23.800)	1.093 (27.762)	1.250 (31.750)	1.406 (35.712)
16	0.500 (12.700)	0.656 (16.662)	0.500 (12.700)	0.843 (21.412)	1.031 (26.187)	1.218 (30.937)	1.437 (36.500)	1.593 (40.462)
18	0.562 (14.275)	0.750 (19.050)	0.500 (12.700)	0.937 (23.800)	1.156 (29.362)	1.375 (34.925)	1.562 (39.675)	1.781 (45.237)
20	0.593 (15.062)	0.812 (20.625)	0.500 (12.700)	1.031 (26.187)	1.280 (32.512)	1.500 (38.100)	1.750 (44.450)	1.968 (49.987)
24	0.687 (17.450)	0.968 (24.587)	0.500 (12.700)	1.218 (30.937)	1.531 (38.887)	1.812 (46.025)	2.062 (52.375)	2.343 (59.512)

[edit]NPS 26 to NPS 36

NPS^[5]	DN ^[2]	OD [in (mm)]	Wall thickness [in (mm)]
NPS^[5]	DN ^[2]	OD [in (mm)]	SCH 5s	SCH 10s	SCH 10	SCH 20	SCH 30	SCH 40s/STD	SCH 40	SCH 80s/XS
26	650	26.000 (660.400)	—	—	0.312 (7.925)	0.500 (12.700)	0.375 (9.525)	—	0.500 (12.700)
28	700	28.000 (711.200)	—	—	0.312 (7.925)	0.500 (12.700)	0.625 (15.875)	0.375 (9.525)	—	—
30	750	30.000 (762.000)	0.250 (6.350)	0.312 (7.925)	0.312 (7.925)	0.500 (12.700)	0.625 (15.875)	0.375 (9.525)	—	0.500 (12.700)
32	800	32.000 (812.800)	—	—	0.312 (7.925)	0.500 (12.700)	0.625 (15.875)	0.375 (9.525)	0.688 (17.475)	0.500 (12.700)
34	850	34.000 (863.600)	—	—	0.312 (7.925)	0.500 (12.700)	0.625 (15.875)	0.375 (9.525)	0.688 (17.475)
36	900	36.000 (914.400)	—	—	0.312 (7.925)	—	0.625 (15.875)	0.375 (9.525)	0.750 (19.050)	0.500 (12.700)

[edit]Additional sizes (NPS)

NPS	DN ^[2]	OD [in (mm)]	Wall thickness [in (mm)]
22	550	22.000 (558.800)	0.375
40	1000	40.000 (1,016.000)	?
42	1050	42.000 (1,066.800)	42.000
44	1100	44.000 (1,117.600)	?
48	1200	48.000 (1,219.200)	48.000
52	1300	52.000 (1,320.800)	?
56	1400	56.000 (1,422.400)	?
60	1500	60.000 (1,524.000)	?
64	1600	64.000 (1,625.600)	?
68	1700	68.000 (1,727.200)	?
72	1800	72.000 (1,828.800)	?
76	1900	76.000 (1,930.400)	?
80	2000	80.000 (2,032.000)	?
88	2200	88.000 (2,235.200)	?

（GB标准）钢管壁厚等级（Sch）表示方法

钢管的壁厚等级系列的表示方法在不同标准中所表示的方法各不相同。主要有三种表示方法：

1）以管子表号（Sch）表示：

对于碳钢管壁厚有：Sch10、20、30、40、60、80、100、120、140、160等10个等级（若数字后面加S，表示不锈钢管）；

对于不锈钢壁厚系列有：5S、10S、40S、80S四个等级

2）以管子重量表示，如STD(标准重量)，XS(加厚管)，XXS(特厚管)

3）以钢管壁厚尺寸表示，即“管外径×壁厚”，如φ89X4

钢管壁厚分级表（GB标准）

公称直径 DN	外径(D)		公称壁厚
公称直径 DN	A系列	B系列	Sch 5s	Sch 10s	Sch 20s	LG	Sch 20	Sch 30	STD	Sch 40	Sch 60	XS	Sch 80	Sch 100	Sch 120	Sch 140	Sch 180
15 20 25	21.3 26.9 33.7	18 25 32	1.6 1.6 1.6	2.1 2.1 2.8	2.6 2.6 3.2	- - -	- - -	- - -	- - -	2.9 2.9 3.2	- - -	- - -	3.6 4.0 4.5	- - -	- - -	- - -	4.5 5.6 6.3
32 40 50	42.4 48.3 60.3	38 45 57	1.6 1.6 1.6	2.8 2.8 2.8	3.2 3.2 3.6	- - -	- - 3.2	- - -	- - -	3.6 3.6 4.0	- - -	- - -	5.0 5.0 5.6	- - -	- - -	- - -	6.3 7.1 8.8
65 80 90	76.1 88.9 101.6	76 89 -	2.0 2.0 2.0	3.0 3.0 3.0	3.6 4.0 4.0	- - -	4.5 4.5 4.5	- - -	- - -	5.0 5.6 5.6	- - -	- - -	7.1 8.0 8.0	- - -	- - -	- - -	10.0 11.0 12.5
100 125 150	114.3 139.7 168.3	108 133 159	2.0 2.9 2.9	3.0 3.4 3.4	4.0 5.0 5.0	- - -	5.0 5.0 5.6	- - -	- - -	5.9 6.3 7.1	- - -	- - -	8.8 10.0 11.0	- - -	11.0 12.5 14.2	- - -	14.2 16.0 17.5
200 250 300	219.1 273.0 323.9	219 273 325	2.9 3.6 4.0	4.0 4.0 4.5	6.3 6.3 6.3	- - -	6.3 6.3 6.3	7.1 8.0 8.8	- - -	8.0 8.8 10.0	10.0 12.5 14.2	- - -	12.5 16.0 17.5	16.0 17.5 22.2	17.5 22.2 25.0	20.0 25.0 28.0	22.2 28.0 32.0
350 400 450 500 550 600	355.6 406.4 457.0 508.0 559 610	377 426 478 529 - 630	4.0 4.0 4.0 5.0 5.0 5.6	5.0 5.0 5.0 5.6 5.6 6.3	- - -	8.0 8.0 8.0 8.0 8.0 8.0	8.0 8.0 8.0 10.0 - -	10.0 10.0 11.0 12.5 - -	10.0 10.0 10.0 10.0 10.0 10.0	11.0 12.5 14.2 16.0 - 17.5	16.0 17.5 20.0 20.0 - -	13.0 13.0 13.0 13.0 13.0 13.0	20.0 22.2 25.0 28.0 30.0 32.0	25.8 28.5 30.0 32.0 - -	28.0 30.0 36.0 40.0 - -	32.0 36.0 40.0 45.0 - -	36.0 40.0 45.0 50.0 - -
650 700 750	660 711 762	- 720 -	- - -	- - -	- - -	8.0 8.0 8.0	- - -	- - -	10.0 10.0 10.0	- - -	- - -	13.0 13.0 13.0	- - -	- - -	- - -	- - -	- - -
800 850 900	813 864 914	820 - 920	- - -	- - -	- - -	8.0 8.0 8.0	- - -	- - -	10.0 10.0 10.0	- - -	- - -	13.0 13.0 13.0	- - -	- - -	- - -	- - -	- - -
950 1000 1050	965 1016 1067	- 1020 -	- - -	- - -	- - -	8.0 8.0 8.0	- - -	- - -	10.0 10.0 10.0	- - -	- - -	13.0 13.0 13.0	- - -	- - -	- - -	- - -	- - -
1100 1150 1200	1118 1168 1219	1120 - 1220	- - -	- - -	- - -	8.0 8.0 8.0	- - -	- - -	10.0 10.0 10.0	- - -	- - -	13.0 13.0 13.0	- - -	- - -	- - -	- -

ASTM A312 重量表（表一）
尺寸SIZE		外径	Sch 5S					Sch 10S
尺寸SIZE		OD(mm)	厚度	304L		316L		厚度	304L		316L
NPS	NB		W.T(mm)	＄/MT	KG/M	＄∕MT	KG/M	W.T(mm)	＄∕MT	KG/M	＄∕MT	KG/M
1/8″	6	10.29						1.24	5680	0.28	8470	0.28
1/4″	8	13.72						1.65	5100	0.50	7900	5.00
3/8″	10	17.15						1.65	4770	0.64	7500	0.64
1/2″	15	21.34	1.65	4490	0.81	7300	0.81	2.11	4500	1.01	7300	1.02
3/4″	20	26.67	1.65	4270	1.03	7070	1.03	2.11	4280	1.29	7080	1.30
1″	25	33.40	1.65	4100	1.31	6900	1.31	2.77	4000	2.11	6800	2.13
1-1/4″	32	42.16	1.65	4100	1.67	6900	1.68	2.77	4000	2.72	6800	2.74
1-1/2″	40	48.26	1.65	4100	1.92	6900	1.93	2.77	4000	3.14	6800	3.16
2″	50	60.33	1.65	4100	2.41	6900	2.43	2.77	4000	3.97	6800	4.00
1-1/2″	65	73.03	2.11	4100	3.73	6900	3.75	3.05	4000	5.32	6800	5.35
3″	80	88.90	2.11	4100	4.56	6900	4.59	3.05	4000	6.52	6800	6.56
3-1/2″	90	101.60	2.11	4100	5.23	6900	5.26	3.05	4000	7.49	6800	7.54
4″	100	114.30	2.11	4100	5.90	6900	5.93	3.05	4000	8.45	6800	8.51
5″	125	141.30	2.77	4200	9.56	7000	9.62	3.40	4100	11.70	6900	11.80
6″	150	168.28	2.77	4200	11.40	7200	11.50	3.40	4100	14.00	6900	14.10
8″	200	219.08	2.77	4400	14.90	7200	15.00	3.76	4300	20.20	7100	20.30
10″	250	273.05	3.40	4500	22.80	7300	23.00	4.19	4400	28.10	7300	28.20
12″	300	323.85	3.96	4700	31.60	7500	31.80	4.57	4600	36.30	7400	36.60
ASTM A312 重量表（表二）
尺寸SIZE		外径	Sch 40S					Sch 80S
尺寸SIZE		OD(mm)	厚度	304L		316L		厚度	304L		316L
NPS	NB		W.T(mm)	＄/MT	KG/M	＄/MT	KG/M	W.T(mm)	＄∕MT	KG/M	＄∕MT	KG/M
1/8″	6	10.29	1.73		0.37		0.37	2.41		0.47		0.48
1/4″	8	13.72	2.24		0.64		0.64	3.02		0.80		0.81
3/8″	10	17.15	2.31		0.85		0.86	3.20		1.11		1.12
1/2″	15	21.34	2.77	4500	1.28	7300	1.29	3.73		1.64		1.65
3/4″	20	26.67	2.87	4280	1.70	7080	1.71	3.91		2.22		2.23
1″	25	33.40	3.38	4100	2.53	6900	2.54	4.55		3.27		3.29
1-1/4″	32	42.16	3.56	4100	3.42	6900	3.45	4.85		4.51		4.54
1-1/2″	40	48.26	3.68	4100	4.09	6900	4.11	5.08		5.46		5.50
2″	50	60.33	3.91	4100	5.50	6900	5.53	5.54		7.56		7.61
1-1/2″	65	73.03	5.16		8.72		8.78	7.01		11.50		11.60
3″	80	88.90	5.49		11.40		11.50	7.62		15.40		15.50
3-1/2″	90	101.60	5.74		13.70		13.80	8.08		18.30		18.90
4″	100	114.30	6.02		16.20		16.30	8.56		22.50		22.70
5″	125	141.30	6.55		22.00		22.10	9.52		31.30		31.50
6″	150	168.28	7.11		28.50		28.70	10.97		43.00		13.30
8″	200	219.08	8.18		43.00		43.20	12.70		65.30		65.70
10″	250	273.05	9.27		60.90		61.30	12.70		82.40		82.90
12″	300	323.85	9.52		74.50		75.00	12.70		98.40		99.10

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