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ASHRAE Publishes 2013 Editions of Refrigerant Safety Standards

Feb. 4, 2014
ASHRAE announced the publication of the 2013 editions of its two major refrigerant standards: Standard 34 and Standard 15.

ASHRAE recently announced the publication of the 2013 editions of its two major refrigerant standards: ANSI/ASHRAE Standard 34, Designation and Safety Classification of Refrigerants, and ANSI/ASHRAE Standard 15, Safety Standard for Refrigeration Systems.


The 2013 version of Standard 34 contains 36 published addenda to the 2010 version. Among the key changes are:

• Designations and safety classifications for one new single-compound refrigerant and 14 new refrigerant blends.

• New concentration limits for 19 refrigerants.

• New flammability safety classifications for four refrigerants.

• The assignment of toxicity code classifications for 18 refrigerants.

• Clarification of the methodology for conducting flammability tests and determining fractionated compositions for flammability tests.

• An updated methodology for calculating heat of combustion for refrigerant blends.

• The requirement that evidence of the existence of an azeotropic blend be provided with requests for an R-500 series designation.

• The addition of bubble-point and dew-point definitions and test conditions, clarified applicant documentation requirements related to GLP compliance, and critical pressure data and specific volume-calculation methodology for applicant submissions.

The 2013 version of Standard 15 contains five published addenda to the 2010 version. Key changes include:

• Clarified location requirements for machinery-room mechanical ventilation.

• The clarification that design pressure is expressed in terms of relative pressure or gauge pressure, not absolute pressure.

• The addition of wording intended to ensure the standard more closely harmonizes with Section 1101.10 of the 2012 International Mechanical Code.

Standard 34-2013 and Standard 15-2013 are sold together. The cost is $89 for ASHRAE members and $107 for non-members. Copies can be ordered by phone at 1-800-527-4723 (United States and Canada) or 404-636-8400, by fax at 678-539-2129, or online at

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Described by a colleague as "a cyborg ... requir(ing) virtually no sleep, no time off, and bland nourishment that can be consumed while at his desk" who was sent "back from the future not to terminate anyone, but with the prime directive 'to edit dry technical copy' in order to save the world at a later date," Scott Arnold joined the editorial staff of HPAC Engineering in 1999. Prior to that, he worked as an editor for daily newspapers and a specialty-publications company. He has a bachelor's degree in journalism from Kent State University.