Letters of Interpretation | Occupational Safety and Health Administration

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.

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Date	Title	Standard Number
12/20/1999	PSM coverage of oil and gas production and separation facilities.	1910.119(a), 1926.64(a)
11/23/1999	PSM standard applicability to a table glassware manufacturing process.	1910.119(a)(1)
11/04/1999	PSM coverage of oil and gas production and separation facilities.	1910.119(a), 1926.64(a)
07/09/1999	Applicability of the PSM standard to a flammable liquid manufacturing process.	1910.119, 1910.119(a)(1)(ii)(B), 1910.119(e), 1926.64, 1926.64(a)(1)(ii)(B), 1926.64(e)
04/30/1999	PSM applicability to a 50% Solution of Hydroxylamine.	1910.119(a)
12/09/1998	PSM standard coverage of liquefied natural gas (LNG) facilities.	1910.119, 1926.64
05/29/1998	PSM Standard exemption for "normally unoccupied remote facilites" (water treatment plant).	1910.119(a)(2)(iii), 1926.64(a)(2)(iii)
03/05/1998	Recalculating pressure vessel design; codes "no longer in use."	1910.119(d)(3)(iii), 1926.64(d)(3)(iii)
02/04/1998	Applicability of PSM standard to explosive and pyrotechnic manufacturing.	1910.119, 1910.109(k)(2), 1910.109(k)(3)
01/22/1998	Steps for updating and revalidating a Process Hazard Analysis (PHA).	1910.119(e)(6), 1910.119(e)(3), 1926.64(e)(6), 1926.64(e)(3)
12/12/1997	Electrical hazardous area classification drawings in the workplace.	1910.119, 1910.307
06/30/1997	Sodium Azide as Used in the Manufacturing Process of Automobile Air Bags.	1910.109, 1910.119
05/16/1997	1910.119 does not apply to public displays of flame effects.	1910.119
05/12/1997	Coverage of Stored Flammables Under the Process Safety Management Standard.	1910.119(a)(1)(ii)(B), 1926.64(a)(1)(ii)(B), 1910.106
04/29/1997	The Process Safety Management Standard.	1910.119, 1926.64
02/28/1997	Akzo-Nobel Chemicals - Limits of a Process	1910.119
11/25/1996	Citations which were issued to Heinz, U.S.A.	1910.119, 1910.146
11/19/1996	Response regarding the application of the OSHA Process Safety Management Standard to utility LPG distribution facilities.	1910.119
10/31/1996	Process Safety Management of Highly Hazardous Chemicals and process hazard analyses.	1910.111, 1910.119, 1928.21
09/16/1996	Clarification on the documentation of inspections and tests required under the mechanical integrity provisions.	1910 - Table of Contents, 1910.119