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YHMCO - Pipe Size brief explanation

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Robert Huang

NPS and NB can be used interchangeably to refer to the nominal pipe size or bore of piping. NPS refers to the North American standard of nominal pipe sizing in inches, while DN refers to the European standard of nominal pipe sizing in millimeters. The table shows equivalencies between NPS, DN, and SU sizes according to JIS B 2309 for butt-welding pipe fittings. For NPS 5 and larger, the DN size is equal to the NPS multiplied by 25, rather than 25.4.

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NB (nominal bore) can be used interchangeably with NPS. Not national pipe size NPS DN nominal pipe size North American Inch diameter normal European millimeter
The relation between NPS, DN and SU NPS DN SU鐚JIS B 2309鐚 inch mm mm 1 25 30 1.1/4 32 40 1.1/2 40 50 2 50 60 2.1/2 65 75 3 80 80 4 100 100 5 125 125 6 150 150 8 200 200 10 250 250 JIS B 2309: Butt-welding pipe fittings for light gauge stainless steel tubes for ordinary use For NPS of 5 and larger, the DN is equal to the NPS multiplied by 25. (not 25.4)
References: WIKIPEDIA - Nominal Pipe Size WIKIPEDIA - Pipe (fluid conveyance) PIPING ENGINEERING - Nominal Pipe Size NPS, Nominal Bore NB, Outside Diameter OD Robert Huang +886-4-2681-5496 robert@yhmco.com.tw No.69, Yu-Shih Rd., Dajia Dist. Taichung City , Taiwan

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YHMCO - Pipe Size brief explanation

  • 1. NB (nominal bore) can be used interchangeably with NPS. Not national pipe size NPS DN nominal pipe size North American Inch diameter normal European millimeter
  • 2. The relation between NPS, DN and SU NPS DN SU鐚JIS B 2309鐚 inch mm mm 1 25 30 1.1/4 32 40 1.1/2 40 50 2 50 60 2.1/2 65 75 3 80 80 4 100 100 5 125 125 6 150 150 8 200 200 10 250 250 JIS B 2309: Butt-welding pipe fittings for light gauge stainless steel tubes for ordinary use For NPS of 5 and larger, the DN is equal to the NPS multiplied by 25. (not 25.4)
  • 3. References: WIKIPEDIA - Nominal Pipe Size WIKIPEDIA - Pipe (fluid conveyance) PIPING ENGINEERING - Nominal Pipe Size NPS, Nominal Bore NB, Outside Diameter OD Robert Huang +886-4-2681-5496 robert@yhmco.com.tw No.69, Yu-Shih Rd., Dajia Dist. Taichung City , Taiwan