Pipes and Tubes - Imperial vs. Metric Sizes

SI vs. Imperial pipe sizes.

Nominal Imperial Pipe Size (NPS)	Nominal Metric Pipe Size (DN)	ASHRAE (mm)	AWWA (mm)	NFPA (mm)	ASTM copper tube (mm)
1/8	6				6
3/16	8				8
1/4	10	8			10
3/8	12	10			12
1/2	15	15	12.7, 13	12	15
5/8	18				18
3/4	20	20			22
1	25	25	25	25, 25.4	28
1 1/4	32	32		33	35
1 1/2	40	40	45	38, 38.1	42
2	50	50	50, 50.8	51	54
2 1/2	65	65	63, 63.5	63.5, 64	67
3	80	80	75	76, 80	79
3 1/2	90			89
4	100	100	100	102	105
4 1/2	115		114.3
5	125			127	130
6	150	150	150	152	156
8	200	200	200	103	206
10	250	250	250		257
12	300	300	300	305	308
14	350		350
16	400		400
18	450
20	500		500
24	600		600
28	700
30	750
32	800
36	900
40	1000
44	1100
48	1200
52	1300
56	1400
60	1500

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Pipes and Tubes - Imperial vs. Metric Sizes

SI vs. Imperial pipe sizes.

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