Standard Interpretations
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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.
- 1910.111 - Back-welding of threaded connections in anhydrous ammonia service. - 01/31/1991
- 1910.111 - Process Safety Management of Highly Hazardous Chemicals and process hazard analyses. - 10/31/1996
- 1910.111 - Respiratory protection for anhydrous ammonia storage installations. - 12/07/1998
- 1910.111(b) - Requirements relative to the use of anhydrous ammonia in Diazo Reproduction machines. - 10/29/1986
- 1910.111(b)(12)(ii) - Clarification of the requirement for an attendant during transfer of anhydrous ammonia. - 04/22/1999
- 1910.111(b)(7)(iv) - Back-welding of threaded connections in anhydrous ammonia service. - 01/31/1991
- 1910.111(e) - Requirements relative to the use of anhydrous ammonia in Diazo Reproduction machines. - 10/29/1986