What is PN in HDPE Pipe?

The PN abbreviation for pressure nominal in Polyethylene pipes indicates the maximum pressure that the pipe can withstand without failure at a specified temperature range.

For example, PN 16 pipe means the pipe can withstand a pressure of 16 bar without failure. Similarly, PN 20 pipe means the pipe is designed to withstand a pressure of 20 bar at the maximum design temperature.

Pipe Class rating vs PN Numbers

Piping Class Ratings are based on the ASME B16.5 or ASME B16.47 standard whereas The PN rating is based on ISO 7005 standard. Table 2 below provides a cross-reference for the PN rating and ASME Class rating.

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