#	Letters of Interpretation
1	06/06/2024 - 1910.119(a) - Storage of pre-charged air conditioners and heat pumps in warehouses or distribution centers
2	03/17/2021 - 1910.119(a) - OSHA PSM and Explosives Standards as They Relate to the DOT Classification "Not in the Explosive Class"
3	06/28/2019 - 1910.119(a) - PSM and Aerosol (Flammable Gas) Containers Stored in Warehouses/Distribution Centers
4	12/19/2018 - 1910.119(a) - Production facilities that recover natural gas liquids may have enforceable PSM-covered processes
5	03/05/2012 - 1910.119(a)(1)(ii) - PSM for pharmaceutical plant
6	05/21/2009 - 1910.119(a)(1)(ii) - Determining when a mixture would exceed the threshold quantity in a covered process.
7	10/07/2008 - 1910.119(a)(2)(ii) - Extent of OSHA's jurisdiction over worksites involving geological and underground storage facilities for gas and hazardous liquids.
8	09/26/2008 - 1910.119(a)(1)(ii)(B) - Riggs – PSM Coverage of Biodiesel Facilities
9	01/31/2008 - 1910.119(a)(1)(ii) - PSM coverage of utility systems; whether 1910.269 preempts the PSM standard for power generation facilities that serve covered processes.
10	01/31/2008 - 1910.119(a)(1)(i) - PSM coverage of utility systems; whether 1910.269 preempts the PSM standard for power generation facilities that serve covered processes.
11	03/14/2003 - 1910.119(a)(1)(ii)(B) - OSHA enforcement policy of the PSM standard distilleries and related facilities in SIC 2085.
12	02/11/2003 - 1910.119(a)(1)(ii)(B) - Clarification of PSM applicability to processes that are based partly or solely on quantities in connected atmospheric storage tanks.
13	02/01/2002 - 1910.119(a)(1)(ii)(B) - PSM applicability to warehousing flammable liquids and other HHCs.
14	12/08/2000 - 1910.119(a)(1)(ii)(A) - Thomas' MAPP gas glass mold heat processes fall within the PSM hydrocarbon fuels exemption.
15	09/21/2000 - 1910.119(a)(1) - Applicability of PSM standard to on-site use of methane as fuel.
16	04/11/2000 - 1910.119(a) - OSHA will not enforce the PSM standard at oil and gas production facilities.
17	03/14/2000 - 1910.119(a) - Process Safety Management (PSM) applicability to liquid petroleum gas (LPG) bottle filling process.
18	07/09/1999 - 1910.119(a)(1)(ii)(B) - Applicability of the PSM standard to a flammable liquid manufacturing process.
19	05/29/1998 - 1910.119(a)(2)(iii) - PSM Standard exemption for "normally unoccupied remote facilites" (water treatment plant).
20	05/12/1997 - 1910.119(a)(1)(ii)(B) - Coverage of Stored Flammables Under the Process Safety Management Standard.
21	06/15/1992 - 1910.119(a) - Application of Process Safety Management of Highly Hazardous Chemicals to the manufacture of explosives and pyrotechnics.