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Pipe diameter conversion

2025-04-21

The common pipe diameter conversions are as follows:

  • 4 points correspond to the nominal diameter DN15, i.e., a diameter of 1.5 cm;

  • 6 points correspond to the nominal diameter DN20, i.e., a diameter of 2 cm;

  • 1 inch corresponds to the nominal diameter DN25, i.e., a diameter of 2.5 cm;

  • 1.2 inches correspond to the nominal diameter DN32, i.e., a diameter of 3.2 cm;

  • 1.5 inches correspond to the nominal diameter DN40, i.e., a diameter of 4 cm;

  • 2 inches correspond to the nominal diameter DN50, i.e., a diameter of 5 cm;

  • 2.5 inches correspond to the nominal diameter DN65, i.e., a diameter of 6.5 cm;

  • 3 inches correspond to the nominal diameter DN80, i.e., a diameter of 8 cm;

  • 4 inches correspond to the nominal diameter DN100, i.e., a diameter of 10 cm;

  • 5 inches correspond to the nominal diameter DN125, i.e., a diameter of 12.5 cm;

  • 6 inches correspond to the nominal diameter DN150, i.e., a diameter of 15 cm;

  • 8 inches correspond to the nominal diameter DN200, i.e., a diameter of 20 cm;

  • 10 inches correspond to the nominal diameter DN250, i.e., a diameter of 25 cm.

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