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ASME B31.9 - Working Pressure and Temperature Limits

The working pressure and temperature limits of ASME Code B31.9 - Building Services Piping

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ASME B31.9 Building Services Piping applies to the following building services:

  • Condensing water
  • Water for heating and cooling
  • Steam and condensate
  • Vacuum
  • Compressed air and nontoxic nonflammable gases

The working pressure and temperature limits of B31.9 can be summarized to:

ServiceTemperature LimitsPressure Limits
Steam and condensate maximum 366oF (186oC),
minimum 0oF (-18oC)
150 psig (1000 kPa)
Air, gases and vapors maximum 200oF (93oC),
minimum 0oF (-18oC)
150 psig (1000 kPa)
Nonflammable Liquids maximum 250oF (121oC),
minimum 0oF (-18oC)
350 psig (2300 kPa)
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  • Engineering ToolBox, (2003). ASME B31.9 - Working Pressure and Temperature Limits. [online] Available at: [Accessed Day Mo. Year].

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