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Differences Between pn10 and pn16

Flanges are the workhorses of piping systems, creating secure connections between pipes, valves, and other equipment. But navigating flange standards can be confusing, especially when faced with seemingly similar options like PN10 and PN16. This article delves into the key differences between PN10 and PN16 flanges, empowering you to make informed choices for your next project.

What are PN Flanges?

PN stands for "Nominal Pressure," a European designation system specifying the pressure rating a flange can withstand.  These flanges adhere to the ISO 7005-1 or DIN 2501-1 standards, using metric units (bars) for pressure rating.

Key Differences Between PN 10 flange and PN16 Flanges:

  1. Pressure Rating:

    PN10: Designed for a maximum pressure of 10 bars (approximately 145 psi). Suitable for lower pressure applications like water lines, compressed air systems, and low-pressure heating systems.

    PN16: Can handle higher pressures up to 16 bars (approximately 232 psi). Ideal for applications with moderate pressure demands, such as industrial water lines, compressed air systems with higher pressure, and some hydrocarbon processing applications.

  2. Dimensions:

    Up to Size DN150 (NPS 6):  PN10 and PN16 flanges often share identical dimensions, making them interchangeable in terms of fit. This allows for some flexibility during installation if pressure requirements change.

    Above Size DN150 (NPS 6):  PN16 flanges typically have thicker walls and larger bolt holes compared to PN10 for increased strength at higher pressures. These differences become more pronounced with larger flange sizes.

  3. Material Selection:

    Both PN10 and PN16 can be manufactured from various materials like ductile iron, stainless steel, and carbon steel.  The  material selection will depend on the specific application's pressure, temperature, and fluid compatibility requirements.

Choosing the Right Flange:

The selection between PN10 and PN16 hinges on the maximum pressure your system will encounter. Always prioritize a flange with a pressure rating exceeding your anticipated operating pressure to ensure a safe and reliable system. Consider consulting with an engineer or experienced piping professional if you have any doubts.

Additional Considerations:

  • Temperature:  While pressure rating is a primary concern, ensure the chosen flange material is suitable for the operating temperature range of your system.

  • Fluid Compatibility:  The fluid being transported must be compatible with the flange material to prevent corrosion or other adverse reactions.

  • System Specifications:  Some applications might have specific flange standards mandated by regulations or project requirements.


Understanding the subtle differences between PN10 and PN16 flanges equips you to make informed decisions for your piping needs. By considering pressure rating, dimensions, material selection, and other factors, you can ensure the safe and efficient operation of your system.

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