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Pressure





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:

Service Temperature Limits Pressure Limit
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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