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ASME B31.9 Building Services Piping - Working Pressure and Temperature Limits

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

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:

ASME B31.9 Building Services Piping - Working Pressure and Temperature Limits
ServiceTemperature LimitsPressure Limits
Steam and condensate maximum 366 oF (186 oC),
minimum 0 oF (-18 oC)
150 psig (1000 kPa)
Air, gases and vapors maximum 200 oF (93 oC),
minimum 0 oF (-18 oC)
150 psig (1000 kPa)
Nonflammable Liquids maximum 250 oF (121 oC),
minimum 0 oF (-18 oC)
350 psig (2300 kPa)
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