Standard Interpretations - Table of Contents|
| Standard Number:||1926.350; 1926.800; 1926.21|
July 7, 1975
|MEMORANDUM FOR:||DAVID H. RHONE
ASSISTANT REGIONAL DIRECTOR/OSH
|Subject:||Clarification of 29 CFR 1926.350(b)(4) to Permit Cylinders Containing Oxygen, Acetylene or Other Fuel Gas to be Taken into Tunnels
This is in response to your memorandums of April 9, and May 19, 1975, regarding the above subject. Addressing our rationale to 29 CFR 1926, Construction Standards, the following is offered:
The definition of confined space is: "...any space having a limited means of egress, which is subject to the accumulation of toxic or flammable contaminants or has an oxygen deficient atmosphere." When welding or cutting is being performed in any confined spaces, the gas cylinders shall be left on the outside. Fuel gases that are liquefied petroleum gases shall not be used underground in tunnel construction.
In conclusion, a tunnel can be a confined space or an enclosed space or have a confined space in it based on 29 CFR 1926.21(b)(6)(ii) and the evaluation of the CSHO. When a tunnel, due to its size and means of egress is considered an enclosed space, cylinders contained oxygen or fuel gas (except LP) may be taken into this enclosed space. However, under these conditions other applicable tunnel standards would be considered.
A proposed change to 29 CFR 1926.21(b)(6)(ii) will include a deletion of the word "tunnels". In addition, an amendment to the construction standards, Subpart S, Tunnels, is being finalized and will be published in the Federal Register shortly. This amendment will cover the taking of compressed gas cylinders into tunnels.
Barry J. White
Associate Assistant Secretary for
|Standard Interpretations - Table of Contents|
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