Difference Between Standard DN Flange and PN Flange

📅 2026年7月2日 📂 未分类 ✍

Understanding the difference between DN (Diamètre Nominal) and PN (Pression Nominale) flange standards is essential for proper pipeline specification.

DN refers to the nominal diameter of the pipe, while PN refers to the nominal pressure rating. These two parameters are independent but both critical for proper flange selection.

Key Differences

DN: Nominal diameter (internal dimension reference)
PN: Maximum allowable working pressure at 20°C