Supplier of ASTM SA335 Boiler Pipe Pipe and External Piping

1. NPS is short for nominal pipe size, which is based on inches and a schedule (Sched. or Sch.). The term NB (nominal bore) is frequently used interchangeably with NPS.

2. DN is short for nominal diameter, which is measured in millimeters.

3. OD is short for outside diameter, which is measured in millimeters.

Nominal pipesize		Outside Diameter	Nominal Wall Thickness
NPS	DN	OD	SCH 5s	SCH lOs	SGH 10	SCH 20	SCH 30	SCH 40s	STD	SCH 40	SCH 60	SCH 80s	XS	SCH 80	SCH 10O	SCH 20	SCH 140	SCH 160	XXS
		OD	SCH 5s	SCH lOs	SGH 10	SCH 20	SCH 30	SCH 40s	STD	SCH 40	SCH 60	SCH 80s	XS	SCH 80	SCH 10O	SCH 20	SCH 140	SCH 160	XXS
1/8	6	10.3		1.24				1.73	1.73	1.73		2.41	2.41	2.41
1/4	8	13.7		1.65				2.24	2.24	2.24		3.02	3.02	3.02
3/8	10	17.1		1.65				2.31	2,31	2.31		3.20	3.20	3.20
1/2	15	21.3	1.65	2.11				2.77	2.77	2.77		3.73	3.73	3.73				4.78	7.47
3/4	20	26.7	1.65	2.11				2.87	2.87	2.87		3.91	3.91	3.91				5.56	7.82
1	25	33.4	1.65	2.77				3.38	3.38	3.38		4.55	4.55	4.55				6.35	9.09
1l/4	32	42.2	1.65	2.77				3.56	3.56	3,56		4.85	4.85	4.85				6.35	9.7
11/2	40	48.3	1.65	2.77				3.68	3.68	3.68		5.08	5.08	5.08				7.14	10.15
2	50	60.3	1.65	2.77				3.91	3.91	3,9n		5.54	5.54	5.54				8.74	11.07
21/2	65	73.0	2.11	3.05				5.16	5.16	5.16		7.01	7.01	7.01				9.53	14.02
3	80	88.9	2.11	3.05				5.49	5.49	5.49		7.62	7.62	7.62				11.13	15.24
31/2	90	101.6	2.11	3.05				5.74	5.74	5.74		8.08	8.08	8.08
4	100	114.3	2.11	3.05				6.02	6.02	6.02		8.56	8,56	8.56		11.13		13.49	17.12
5	125	141.3	2.77	3.40				6.55	6.55	6.55		9.53	9,53	9.53		12.70		15.88	19.05
6	150	168.3	2.77	3.40				7.11	7.11	7.11		1O.97	1O.97	10.97		14.27		18.26	21.95
8	200	219.1	2.77	3.76		6.35	7.04	8.18	8.18	8.18	10.31	12.70	12.70	12.70	15.09	18.26	20.62	23.01	22.23
1O	250	273.1	3.40	4.19		6.35	7.80	9.27	9.27	9.27	12.70	12.70	12.70	15.09	18.26	21.44	25.40	28.58	25.40
12	300	323.9	3.96	4.57		6.35	8.38	9.53	9.53	1O.31	14.27	12.70	12.70	17.48	21.44	25.40	28.58	33.32	25.40
14	350	355.6	3.96	4.78	6.35	7.92	9.53		9.53	11.13	15.09		12.70	19.05	23.83	27.79	31.75	35.71
16	400	406.4	4.19	4.78	6.35	7.92	9.53		9.53	12.70	i6.66		12.70	21.44	26.19	30.96	36.53	40.49
18	450	457.2	4.19	4.78	6.35	7.92	11.13		9.53	14.27	19.05		12.70	23.83	29.36	34.93	39,67	45.24
2O	500	508	4.78	5.54	6.35	9.53	12.70		9.53	15.09	20.62		12.70	26.19	32.54	38.10	44.45	50.01
22		559	4.78	5.54	6.35	9.53	12.70		9.53		22.23		12.70	28.58	34.93	41.28	47.63	53.98
24	600	610	5.54	6.35	6.35	9.53	14.27		9.53	17.48	24.61		12.70	30.96	38.89	46.02	52.37	59.54
26		660			7.92	12.70			9.53				12.70
28	700	711			7.92	12.70	15.88		9.53				12.70
3O		762	6.35	7.92	7.92	12.70	15.88		9.53				12.70
32	800	813			7.92	12.70	15.88		9.53	17.48			12.70
34		884			7.92	12.70	15.88		9.53	17.48			12.70
36	900	914			7.92	12.70	15.88		9.53	19.05			12.70
38		965							9.53				12.70
40	1000	1016						9.53		12.70
42		1067							9.53				12.70
44	1100	1118							9.53				12.70
46		1168							9.53				12.70
48	1200	1219							9.53			12.70
52		1321
56	1422
6O	1524
64	1600	1626
68		1727
72	1800	1829
76		1930
8O	2000	2032

Comparison of DN, NPS, OD