OSHA 29 CFR 1910.253

OSHA 29 CFR 1910.253 is the federal rule for oxygen-fuel gas welding and cutting in general industry. It sits in 29 CFR 1910 Subpart Q alongside three sister sections: 1910.251 (definitions), 1910.252 (general welding — fire prevention, PPE, ventilation, confined spaces), 1910.254 (arc welding), and 1910.255 (resistance welding).

Seven lettered subsections cover the entire oxy-fuel work cycle — from how cylinders are stored and handled, through how fuel-gas manifolds and service piping are built, to how hoses, regulators, and acetylene generators are used on the shop floor. The rule that welders and facility managers run into most often is the separation rule at (b)(4)(iii): oxygen cylinders and fuel-gas cylinders have to be kept 20 feet apart or separated by a noncombustible barrier.

The full text of 29 CFR 1910.253 is broken into seven lettered subsections. Here is what each covers; the sections further down quote the paragraphs you are most likely to be asked about in an inspection or to need for a spec.

Full regulatory text: osha.gov/laws-regs/regulations/standardnumber/1910/1910.253

Section (b) is the longest and most-cited subsection. It covers how cylinders are marked and approved, where they can be stored, how much fuel gas can be inside a building at any one time, and how cylinders are to be handled when being moved, used, or parked between jobs.

Indoor storage location (b)(2)(ii)

Indoor quantity limit (b)(3)

Anything beyond 2,000 cu ft of fuel gas or 300 lb of LP-gas has to be moved into a special storage room meeting Subpart H construction and ventilation requirements.

Handling, caps, and moving cylinders (b)(5)(ii)

Together these paragraphs are why a purpose-built cylinder cart matters: a "special truck" in (b)(5)(ii)(D) is the exception that lets you move cylinders without removing regulators first, and the valve-protection-cap language in (C) is why carts keep a cap holder.

Acetylene cylinder valve opening (b)(5)(iii)(K)

This is the paragraph that drives cart-buying decisions across welding shops and gas distributors. Here it is as-written:

Two compliant paths for a shop that keeps both oxygen and fuel-gas cylinders on hand:

• 20 feet of distance between oxygen and fuel-gas cylinders when they are in storage
• A noncombustible barrier ≥5 feet high with a ≥30-minute fire-resistance rating separating the two

For a dual-cylinder cart that parks between jobs, the compliant configuration is a firewall cart — a cart frame with an integral steel barrier that satisfies the noncombustible-barrier option directly.

See the Cylinder Cart Selection Guide for cart-type decision help and product options.

Section (c) governs how fuel-gas and oxygen cylinders can be manifolded together for higher-capacity use — portable outlet headers, high-pressure and low-pressure manifolds, and the location requirements that apply to each.

Section (d) covers service piping systems: materials (steel, wrought iron, brass, copper, seamless copper/brass/stainless tubing), design per ANSI B31.1, joint requirements, installation, and proof-testing at 1½× maximum operating pressure. Piping design and installation for a production facility is usually a mechanical-contractor or process-engineer job; this section tells them what OSHA will check.

Acetylene pressure ceiling applies across the system:

Section (e) covers the parts of the system between the cylinder and the torch: hose, regulators, gauges, and protective devices like flashback arrestors.

Hose connections must be able to withstand, without leakage, twice the normal service pressure (and in no case less than 300 psi). Oxygen-service gauges and regulators must be marked "USE NO OIL"; regulators and gauges are only to be used for the gas and pressure they were designed for.

Sections (f) and (g) cover the original way acetylene was produced on-site: stationary and portable acetylene generators, and the calcium carbide feedstock that fuels them. Most modern shops buy acetylene in cylinders and never touch these sections, but the rules are still on the books for facilities that generate their own acetylene.

If this applies to your facility, read the subsections in full on osha.gov — they cover generator location, protection against tampering, calcium carbide container packaging, and indoor/outdoor storage of the carbide itself.

Other OSHA standards

• 29 CFR 1910.252 — general welding, cutting, and brazing requirements (fire watch, hot work authorization, PPE, ventilation, confined spaces)
• 29 CFR 1910.254 — arc welding equipment (separate electrical regime)
• 29 CFR 1910.101 — compressed gases (general); defers to DOT and CGA pamphlets
• 29 CFR 1926.350 — construction-industry equivalent; similar structure, minor wording differences
• 29 CFR 1915 Subpart D — shipyard welding / cutting / heating

Consensus standards referenced by the rule

• CGA pamphlets for rubber welding hose, hose connections, and regulator connections
• ANSI B57.1-1965 — compressed gas cylinder valve outlet and inlet connections
• ANSI B31.1 — pressure piping
• NFPA 51 and NFPA 55 — industry companion standards commonly referenced on top of OSHA

1910.253 citations recur most often in fabricated-metal-products (NAICS 332) and machinery manufacturing (NAICS 333). Historically, the paragraphs that draw citations most often are the cylinder storage and marking rules under (b)(2), the separation rule at (b)(4)(iii), the cylinder-in-use rules at (b)(5)(ii)(I), the hose condition requirements at (e)(5), and the personnel instruction requirement at (a)(4).

Current-year citation data is published by OSHA on the Frequently Cited Standards database. We link to the live source rather than quote a snapshot because the ranking shifts year over year.