ANSI/ASHRAE Standard 34-2010 Designation and Safety Classification of Refrigerants
ANSI/ASHRAE Standard 34-2010 is the latest edition of Standard 34, which describes a shorthand way of naming refrigerants and assigns safety classifications and refrigerant concentration limits based on toxicity and flammability data. The 2010 edition combines Standard 34-2007 and the 37 approved and published addenda to the 2007 edition. More specific information on the content of each addendum and its approval date is included in an informative appendix at the end of this standard.
This standard is intended to establish a simple means of referring to common refrigerants instead of using the chemical name, formula, or trade name. It establishes a uniform system for assigning reference numbers, safety classifications, and refrigerant concentration limits to refrigerants. The standard also identifies requirements to apply for designations and safety classifications for refrigerants and to determine refrigerant concentration limits.
You can also Read ASHRAE Handbook Refrigeration IP and SI 2018
ANSI/ASHRAE Standard 34-2010 Designation and Safety Classification of Refrigerants Changes
- Added fourteen refrigerants to Table 2 and one to Table 1.
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- Modified the method of calculating the heat of combustion to more closely represent what actually occurs and added an informative appendix with an example calculation.
- Added an informative appendix showing an example of the calculation of the ATEL and RCL for a refrigerant blend.
- Revised the oxygen deprivation limit adjustment for altitude by an adding an intermediate adjustment at 1500 m (4920 ft).
- Added occupational exposure limits for the refrigerants in Tables 1 and 2.
- Extended the rules for numbering refrigerants to include ethene, butane-, butene-, and propenebased refrigerants.
- Changed the required testing temperature for flammability. All tests previously required at 100°C (212°F) replaced by testing at 60°C (140°F).
- Added an optional 2L subclass to the existing Class 2 flammability classification, signifying class 2 refrigerants with a burning velocity less than or equal to 10 cm/s.
This standard provides an unambiguous system for numbering refrigerants and assigning composition-designating prefixes for refrigerants. Safety classifications based on toxicity and flammability data included along with refrigerant concentration limits for the refrigerants.
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