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 2” pipe is simply mentioned as DN 50. You can get any NPS to DN by multiplying it with 25. Check the below table for easy understanding. There is no change in other dimensions when you use DN.

Nominal Pipe Size	Diameter Nominal	Nominal Pipe Size	Diameter Nominal
NPS (inches)	DN (mm)	NPS (inches)	DN (mm)
1/8	6	20	500
1/4	8	22	550
3/8	10	24	600
1/2	15	26	650
3/4	20	28	700
1	25	30	750
1 ¼	32	32	800
1 ½	40	36	900
2	50	40	1000
2 ½	65	42	1050
3	80	44	1100
3 ½	90	48	1200
4	100	52	1300
5	125	56	1400
6	150	60	1500
8	200	64	1600
10	250	68	1700
12	300	72	1800
14	350	76	1900
16	400	80	2000
18	450	Based on ASME B36.10

From this table, you can see that initially pipe size increase by ¼ than ½ and then by 1”. Form 6” to 42”, it increases by 2” step and after that in 4”.