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
Handling and Use of Flammable Liquids. 1910.106
The storage and handling of flammable and combustible liquids in Clairol's Stamford warehouse. 1910.106, 1910.106(d), 1910.106(d)(5)(i), 1910.106(d)(5)(vi), 1910.106(d)(5)(vi)(b), 1910.37, 1910.37(b)
Applicability of 1910.106 to Chemical Plants. 1910.106
Applicability of Section 1910.106 to Chemicals Plants. 1910.106
Ventilation requirements for the auto and printing industries. 1910.94, 1910.106, 1910.107, 1910.124, 1910.125(d)(2)
Stored combustible liquids and heating to their flashpoints 1910.106
Transfer of nonflammable and noncombustible liquids via air pressure. 1910.106(e)(2)(iv)(d), 1910.106(a)(18)(ii)(b)
Testing requirements for piping, valves, and fittings; Testing requirements for piping, valves, and fittings 1910.106(c)(1)(i), 1910.106(b)(7)
Interpretations of the terms "large quantity" and "transfer". 1910.106
Paint thinner can be stored in approved plastic one-gallon containers. 1910.106(d)(2)
Standards for flammable and combustible liquids used in industrial plant mixing operations. 1910.106(e), 1910.106(e)(1)(i)(b), 1910.106(e)(3)
Inside storage requirements for consumer commodities less than 50% alcohol. 1910.106(d)(2)
The access to tanks or pressure vessels. 1910.106
Packaging of combustible liquids of 110 gallons or less. 1910.106(d)(2)
The use of fiberglass tanks for storage of crude oil. 1910.106
The British Standard material valves compliance with Occupational Safety and Health Administration standards. 1910.106
Interpretation of the term "bulk plant" as it is used in 1910.106. 1910.106
Clarification of standard 29 CFR 1910.106(b)(4)(iv)(e). 1910.106
The modification of a refrigerator of freezer chest to store flammable liquids. 1910.106
Definition of liquid as applicable to 1926.152. 1910.106(a)(18), 1910.178, 1926.155, 1910.106(a)(19)