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NPS vs DN

June 28, 2019

NPS is the abbreviation for nominal pipe size while DN is short for nominal diameter. The two designations have simple correlation between each other.

NPS	DN
1/8	6
1/4	8
3/8	10
1/2	15
3/4	20
1	25
1-1/4	32
1-1/2	40
2	50
2-1/2	65
3	80
4	100

*The correlation between NPS and DN. For NPS ≥ 4, the related DN = 25 multiplied by the NPS number.

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