ASHRAE Updates Refrigerant Safety Standards
The 2013 editions of ASHRAE’s major refrigerants-related standards, incorporating 41 new addenda, have been published: ANSI/ASHRAE Standard 34-2013, Designation and Safety Classification of Refrigerants, describes a shorthand way of naming refrigerants and assigns safety classifications based on toxicity and flammability data; ANSI/ASHRAE Standard 15-2013, Safety Standard for Refrigeration Systems, establishes rules for safe application in equipment and systems.
ASHRAE sells the standards as a set.
Standard 34-2013 contains the 2010 standard and 36 published addenda. Among the key changes incorporated into the standard are:
- assignment of designations and safety classifications for one new single compound refrigerant and 14 new refrigerant blends.
- changed the refrigeration concentration limits (RCL) values of 19 refrigerants listed in the 2010 standard to comply with more current methodology.
- changed the flammability safety classifications of four refrigerants from Class 2 to Subclass 2L, based on optional burning velocity measurement data.
- added Toxicity Code Classification assignments for 18 refrigerants that had been unassigned in the 2010 standard.
Standard 15 contains the 2010 standard plus five published addenda. Key changes to the standard include:
- clarification of the location requirements for machinery room mechanical ventilation.
- clarification that design pressure is expressed in terms of relative pressure or gauge pressure (not absolute pressure).
- wording to ensure the standard more closely harmonizes with the 2012 International Mechanical Code (IMC) section 1101.10.
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