ISO 817:2014/Amd 2:2021 PDF

Overview

ISO 817:2014/Amd 2:2021 is the second amendment to the International Standard ISO 817, titled "Refrigerants - Designation and safety classification". Published by the International Organization for Standardization (ISO), this updated document refines the guidelines for assigning designations and safety classifications to refrigerants, including individual compounds and blends. It provides crucial revisions related to refrigerant concentration limits, toxicity exposure thresholds, flammability data, and harmonization processes with other standards such as ASHRAE 34.

This amendment plays a critical role in enhancing the safety, identification, and regulation of refrigerants used in refrigeration and air-conditioning systems, thereby supporting industry compliance and environmental sustainability.

Key Topics

• Refrigerant Identification Numbers Unique identifying numbers are assigned for each refrigerant, following updated series for zeotropes (400 series) and azeotropes (500 series), including differentiation by upper-case letters for variations in composition.

• Safety Classification Updates Safety classifications are aligned with exposure limits such as acute toxicity exposure limits (ATEL), oxygen deprivation limits (ODL), and flammable concentration limits (FCL), which are recalibrated based on peer-reviewed scientific data.

• Refrigerant Concentration Limits (RCL) Eliminated This amendment removes references to Refrigerant Concentration Limits (RCL) from tables and text, focusing instead on limiting flammability and toxicity using updated metrics such as Lower Flammable Limits (LFL).

• Updated Toxicity and Flammability Assessment The method to calculate ATEL for blends has been clarified, including formulas based on mole fractions and toxicity concentration factors. Burning velocity data and flammability classifications are expanded upon with new parameters.

• Harmonization with ASHRAE 34 Amendment 2 formalizes a harmonization process to avoid duplication or conflict of refrigerant numbers between ISO 817 and ASHRAE 34, ensuring consistent worldwide designation.

• Applications and Data Submission Protocols for submitting applications for new refrigerants, safety classifications, and concentration limits are defined, including data requirements for toxicity, flammability, and composition. Applications must include comprehensive scientific and engineering data summaries.

Applications

• Refrigerant Industry Usage This amendment is essential for manufacturers and users of refrigerants to correctly identify, classify, and handle refrigerants according to internationally recognized safety standards.

• Safety and Compliance Management Regulatory bodies and safety agencies rely on ISO 817:2014/Amd 2:2021 to assess refrigerant risks related to toxicity, flammability, and exposure, driving safer HVAC and refrigeration system designs.

• Environmental Impact Mitigation Correct classification aids in selecting refrigerants that balance environmental concerns with performance, thus helping reduce the impact of refrigerants on global warming and ozone depletion.

• Standardization of Blends Refrigerant blends, including azeotropes and zeotropes, benefit from clear designation and safety classification, which is vital for refrigeration system servicing and regulatory compliance.

Related Standards

• ISO 817:2014 The base standard on refrigerant designation and safety classification, which Amendment 2 refines and supplements.

• ASHRAE Standard 34 Addresses refrigerant numbering and safety group classification in North America. Harmonization efforts ensure consistent refrigerant designations worldwide.

• AHRI Standard 700 Relates to refrigerant purity, impurities, and limits on contaminants that may affect safety classifications.

• ISO/IEC Directives Part 1 and Part 2 Define the procedures and editorial rules for preparing and maintaining ISO standards, ensuring high-quality documentation.

• ISO 10298 Provides data on toxic concentration factors used for calculating exposure limits referenced in ISO 817.

Keywords: ISO 817 amendment 2, refrigerant designation, refrigerant safety classification, refrigerant concentration limits, refrigerant toxicity, flammability limits, refrigerant blends, zeotropes, azeotropes, ASHRAE harmonization, HVAC safety standards, refrigerant concentration, toxicity exposure limit, lower flammable limit, refrigerant standards, refrigerant safety compliance.