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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:

Service	Temperature Limits	Pressure 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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