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OSHA Issues Revised Memorandum on PSM of Highly Hazardous Chemicals and Covered Concentrations

July 22, 2016

REGULATORY ADVISORY--On July 18, the Occupational Safety and Health Administration (OSHA) released a revised memorandum regarding highly hazardous chemicals and their covered concentrations, which has rescinded and replaced the original June 5, 2015 memorandum. Read the detailed memorandum on OSHA's website.

The revised memorandum provides better clarity for determining the quantity of a highly hazardous chemical (HHC) in a process, and thus whether the process contains an HHC quantity above the threshold limits listed in Appendix A of 29CFR 1910.119. In general, the revised memorandum specifies that one should calculate the weight of the HHC present in the process using a method similar to the approach used by the Environmental Protection Agency (EPA) in the Clean Air Act Amendment.

Additional information is provided in the memorandum regarding implementation of Process Safety Management for processes that are now "covered" according to the memorandum requirements. 

Learn more about US regulatory reforms for process safety.


About ABS

ABS, a leading global provider of classification and technical advisory services to the marine and offshore industries, is committed to setting standards for safety and excellence in design and construction. Focused on safe and practical application of advanced technologies and digital solutions, ABS works with industry and clients to develop accurate and cost-effective compliance, optimized performance and operational efficiency for marine and offshore assets.   

About ABS Group

ABS Group of Companies, Inc. (, through its operating subsidiaries, provides data-driven risk and reliability solutions and technical services that help clients confirm the safety, integrity, quality and environmental efficiency of critical assets and operations. Headquartered in Houston, Texas, ABS Group operates with more than 1,300 professionals in over 25 countries serving the marine and offshore, oil, gas and chemical, industrial manufacturing and government sectors. ABS Group is a subsidiary of ABS, a leading marine and offshore classification society.

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