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| Pressure Rating ANSI Class vs Nominal Pressure (PN) | |||||||||||||||
| Flange Pressure Nominal, PN | 20 | 50 | 68 | 100 | 150 | 250 | 420 | . | . | |||||||
| Flange Class | 150 | 300 | 400 | 600 | 900 | 1500 | 2500 | |||||||||
| Note: PN is the rating designator followed by a designation number indicating the approximate pressure rating in bars. | ||||||||||||||||
| Equivalence Nominal Pipe Size (NPS) to Nominal Diameter (DN) | ||||||||||||||||
| Nominal Diameter, mm | DN6 | DN8 | DN10 | DN15 | DN20 | DN25 | DN32 | DN40 | DN50 | |||||||
| NPS, inch | 1/8" | 1/4" | 3/8" | 1/2" | 3/4" | 1" | 1 1/4" | 1 1/2" | 2" | |||||||
| Nominal Diameter, mm | DN65 | DN80 | DN100 | DN125 | DN150 | DN200 | DN250 | DN300 | DN350 | |||||||
| NPS, inch | 2 1/2" | 3" | 4" | 5" | 6" | 8" | 10" | 12" | 14" | |||||||
| Nominal Diameter, mm | DN375 | DN400 | DN450 | DN500 | DN600 | DN700 | DN750 | DN800 | DN900 | |||||||
| NPS, inch | 15" | 16" | 18" | 20" | 24" | 28" | 30" | 32" | 36" | |||||||