A PN40 flange has a fixed nominal pressure rating of 40 bar (approximately 580 psi).
Unlike the ASME/ASA system, the PN system uses a single pressure class designation that assumes the maximum pressure is at ambient temperature (around 20°C).
The maximum working pressure for a PN40 flange generally decreases if the temperature rises significantly.
Maximum Working Pressure for PN40 Flanges
Temperature Range
PN40 Max Pressure (bar)
Up to 20°C (Ambient)
40 bar
Above 20°C (e.g., 100°C)
Pressure derates based on material
For common materials:
Steel (Carbon or Stainless): The 40 bar rating is typically maintained across a wide temperature range if the material allows for it.
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