29 CFR 1910.101: OSHA Compressed Gases

Regulatory citation: 29 CFR 1910.101, Compressed Gases (General Requirements) (Hazardous Materials, Subpart H)

What Is the OSHA Compressed Gases Standard?

Section 1910.101 is a short general industry standard with three paragraphs. It requires employers to inspect compressed gas cylinders, to handle, store and use compressed gases in line with a Compressed Gas Association (CGA) pamphlet, and to fit and maintain pressure relief devices. Most of the detail sits in the documents it references, not in the regulation itself.

It applies to compressed gases in cylinders, portable tanks, rail tank cars and motor vehicle cargo tanks. Separate OSHA standards add rules for specific gases, including acetylene (1910.102), hydrogen (1910.103), oxygen (1910.104) and nitrous oxide (1910.105).

Why Compressed Gas Safety Matters

A cylinder holds a large amount of stored energy. A damaged valve can turn a cylinder into a projectile, and leaking gas can cause fire, explosion, toxic exposure or asphyxiation. Simple controls such as inspection, securing and valve protection prevent most incidents.

Core Obligations

1. Inspect Cylinders Under Your Control (1910.101(a))

Employers must determine that compressed gas cylinders under their control are in a safe condition, to the extent this can be found by visual inspection. Inspections must follow the Department of Transportation hazardous materials regulations in 49 CFR Parts 171–179 and 14 CFR Part 103. Where those do not apply, inspections must follow CGA Pamphlets C-6-1968 and C-8-1962.

2. Handle, Store and Use Gases per CGA P-1 (1910.101(b))

The in-plant handling, storage and use of all compressed gases in cylinders, portable tanks, rail tank cars or motor vehicle cargo tanks must follow CGA Pamphlet P-1-1965. OSHA has explained that "in-plant" refers to fixed workplaces. Under its de minimis policy, an employer that follows a more current edition of P-1 giving equal or greater protection will not be cited for the difference.

3. Fit and Maintain Pressure Relief Devices (1910.101(c))

Compressed gas cylinders, portable tanks and cargo tanks must have pressure relief devices installed and maintained in line with CGA Pamphlets S-1.1-1963 (with its 1965 addenda) and S-1.2-1963. For welding and cutting gases, 1910.253(b)(5) also bars tampering with cylinder safety devices.

4. Keep Cylinders Upright and Secured

In a 2021 interpretation, OSHA stated that its standards require compressed gas cylinders to be in an upright or valve-end-up position. In a 1992 letter, OSHA said cylinders with a water volume under 305 cubic inches (5.0 liters) may be stored horizontally under CGA P-1-1991 only if properly secured against falling, and that the type of gas, such as acetylene, may rule this out.

5. Apply Gas-Specific Standards

Where a specific standard applies, employers must meet it as well. For example, 1910.253(b) requires oxygen cylinders in storage to be separated from fuel-gas cylinders or combustible materials by at least 20 feet, or by a noncombustible barrier at least 5 feet high with a fire-resistance rating of at least one-half hour. It also requires acetylene cylinders to be stored valve end up and valve caps to be kept hand-tight when cylinders are not in use.

6. Handle Cylinders Without Damage (1910.253(b)(5))

For welding and cutting gases, cylinders must not be dropped, struck or knocked together, and valve caps must not be used for lifting. When cylinders are moved by crane, a cradle, boat or suitable platform must be used, and slings or electric magnets must not be used. Valves must be closed before cylinders are moved and when work is finished.

Common Compliance Approaches

Receiving Inspection

Check each delivered cylinder for dents, corrosion, damaged valves, missing caps and a legible gas label before it is accepted.

Designated Storage Areas

Use marked storage spots with racks or chains, separate full and empty cylinders, and keep oxidizers apart from fuel gases.

Obtain Current CGA Guidance

Keep a current edition of CGA P-1 on hand and use it to write site rules, since the regulation itself gives little detail.

Example: Compressed Gas Safety in Practice

A metal fabrication shop finds oxygen and acetylene cylinders stored loose against a wall next to the loading dock. It builds a rack with chains for each cylinder, places oxygen and acetylene more than 20 feet apart, and requires valve caps whenever cylinders are not connected. Receiving staff are trained to reject cylinders with damaged valves or no gas label. A cylinder cart with a chain is bought for moving cylinders, and staff are told never to lift cylinders by the cap.

Related regulations: OSHA welding and hot work, OSHA HazCom, OSHA flammable liquids.

Note: OSHA has stated that the Subpart H standards, including 1910.101(b), do not apply to compressed air cylinders, although unsafe handling of those cylinders can still be cited under the General Duty Clause. State plan states may set stricter rules.

Frequently Asked Questions

Does OSHA require cylinders to be chained?

Section 1910.101 does not use the word chain. It requires handling and storage in line with CGA P-1, OSHA has said cylinders must be upright or valve end up, and has accepted horizontal storage of small cylinders only when they are secured against falling. Chains, straps and racks are common ways to secure cylinders.

Can I follow a newer edition of CGA P-1?

Yes. OSHA treats following a more current edition that gives equal or greater protection as a de minimis condition, which means no citation or penalty.

Who is responsible for inspecting cylinders?

The employer must make sure cylinders under its control are in safe condition, as far as visual inspection can tell. Where DOT rules apply to the cylinder, the inspection must follow them, and CGA C-6 and C-8 apply otherwise.