Letters of Interpretation

OSHA requirements are set by statute, standards, and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. Each letter constitutes OSHA's interpretation of the requirements discussed.

Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information.

These letters of interpretation and the standards they address may not apply to OSHA State Plans. State Plans are required to have standards and enforcement programs that are at least as effective as OSHA's and may have different or additional requirements. Please see OSHA-approved State Plans for more information.

NOTICE:

How to Request a Letter of Interpretation

Filters


Date Title Standard Number
Interpretation of the Process Safety Management (PSM) of Highly Hazardous Chemicals (HHCs) standard. 1910.119
Requesting interpretation of the Process Safety Management Standard of Highly Hazardous Chemicals Standard. 1910.119
PSM clarification on flammable lubrication in aerosol cans, to prevent foods from sticking to heated cookware 1910.119
HHC as it applies to tank battery. 1910.119
Process Safety Management of Highly Hazardous Chemicals as it may apply to more than 250 pounds thionyl chloride stored on your work site. 1910.119
Clarification on whether flammable liquids used to mix (1) inks used in printing on aluminum foil and paper and (2) paint used in coating aluminum sheets are covered by the PSM standard. 1910.119
PSM as it may apply to processes containing HHCs. 1910.119
Process Safety Management of Highly Hazardous Chemicals standard as it may apply to the batch chemical processes. 1910.119
Clarifications of the OSHA standards, 29 CFR 1910.109 and 29 CFR 1910.119. 1910.109, 1910.119
OSHA's policy for inspections related to the Process Safety Management standard. 1910.119
Process Safety Management - Threshold quantity is determined on the amount of HHC in the process. 1910.119
Process Safety Management of highly hazardous chemicals - parts cleaning station involving flammable liquids. 1910.119
The Process Safety Management (PSM) of Highly Hazardous Chemicals (HHC) standard. 1910.119
HHC's as it applies to wood digestion process containing multiple toxic and flammable liquid HHCs. 1910.119
HHC's as it applies to employer obligation to obtain and evaluate information regarding the contract employer's safety performance and programs 1910.119
Process Safety Management Standard (PSM) of Highly Hazardous Chemicals (HHCs) standard. 1910.119
HHC's as it applies to pulp and paper industry processes that contain chlorine dioxide 1910.119
Clarifications of the OSHA standards 1910.109 and 1910.119. 1910.109, 1910.119
HHC's as it applies to hydrochloric acid, hydrofluoric acid, hydrogen sulfide, hydrogen cyanide. 1910.119
HHC's as it applies to exterior, interior tanks. 1910.119