🔹 What is PN?

PN stands for Pressure Nominal. It indicates the maximum allowable working pressure of a pipe in bar at the reference temperature of 20°C.

• Example:

  • A pipe with PN6 can withstand up to 6 bar at 20°C.

  • A pipe with PN16 can withstand up to 16 bar at 20°C.

🔹 Unit of PN

The PN number directly corresponds to pressure in bar:

• 1 bar ≈ 0.1 MPa ≈ 14.5 psi

• Therefore, a pipe with PN10 can withstand about 1 MPa of internal pressure.

🔹 Relationship between PN and Wall Thickness

The ratio between outer diameter (OD) and wall thickness (e) is expressed as SDR (Standard Dimension Ratio):

• Smaller SDR → thicker wall → higher resistance.

• General rule: Higher PN → Lower SDR → Thicker wall → Stronger pipe.

🔹 Typical PN vs SDR and Applications

🔹 Effect of Temperature on PN

PN values are defined at 20°C. At higher temperatures, pipe resistance decreases. For PE100 pipes (PN16):

🔹 Typical Applications by PN