Pipe Schedule (NPS)

Nominal Pipe Size (NPS): outside diameter is fixed per size; the schedule sets wall thickness. All values in mm (ASME B36.10M).

NPS	OD (mm)	Sch 40 wall	Sch 80 wall
1/8	10.29	1.73	2.41
1/4	13.72	2.24	3.02
3/8	17.15	2.31	3.2
1/2	21.34	2.77	3.73
3/4	26.67	2.87	3.91
1	33.4	3.38	4.55
1¼	42.16	3.56	4.85
1½	48.26	3.68	5.08
2	60.33	3.91	5.54
2½	73.03	5.16	7.01
3	88.9	5.49	7.62
4	114.3	6.02	8.56
6	168.28	7.11	10.97
8	219.08	8.18	12.7
10	273.05	9.27	12.7
12	323.85	10.31	14.27

Inside diameter = OD − 2 × wall. Pressure drop through the bore: Pipe Pressure Drop.

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