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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How to Request a Letter of Interpretation

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Date Title Standard Number
Safety of Compressed Gas Cylinders on Portable Carts 1910.101 - Index, 1910.101(b), 1910.102(a), 1910.253(b)(3)(ii), 1910.253(b)(5)(ii)(D), 1910.253(b)(5)(iii)(A), 1910.253(b)(5)(iii)(B), 1926.350(a)(7), 1926.350(a)(9), 1926.350(b)(3), 1926.350(j)
Lifting compressed-gas cylinders 1910.253(b)(5)(ii)(A)
NRTL requirements for shielding gas regulators. 1910 Subpart S, 1910.303(a), 1910.399, 1910 Subpart Q, 1910.251, 1910.253
Use of the BoaGripTM sling to move compressed-gas cylinders in general industry. 1910.101, 1910.101(b), 1910.253, 1910.253(b)(5)(ii)(A)
Use of the "Regulator Umbrella" for "in use" or "connected for use" conditions for portable compressed gas cylinders. 1910.253, 1910.253(b)(5)(ii)(B), 1910.253(b)(5)(ii)(D), 1910.253(b)(5)(ii)(I), 1926.350, 1926.350(a)(10)
Storage of oxygen and acetylene cylinders for construction vs. general industry. 1910.253, 1910.253(b)(2), 1910.253(b)(3), 1910.253(b)(4), 1926.350, 1926.350(a)(10)
General industry and construction standards regarding "in use" or "ready to use" and "storage" of compressed gas and oxygen cylinders for welding; §1910.253(b)(2)-1910.253(b)(4) and §1926.350(a)(10). 1910.253, 1910.253(b)(2), 1910.253(b)(3), 1910.253(b)(4), 1926.350, 1926.350(a)(10)
Training and competency for oxygen-fuel gas welding equipment use 1910.253(a)(4), 1910.252(a)(2)(xiii)(C)
Movement of compressed gas cylinders with regulators installed and "special truck" requirement 1910.253
Temporary storage carrier for oxygen and acetylene cylinders. 1910.253
Maintaining Workplace Acetylene Cylinders 1910.253
Flashback Arrestors and Backflow Protective Equipment for Welding Operations. 1910.253
Compressed Gas Cylinder Valve Protector 1910.253(b)(1)(iv)
Interpretation of "special truck" as identified in 1910.252(a)(2) (v)(b)(4) 1910.253(b)(5)(ii)(D)