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Subchapter 7. General Industry Safety Orders
Group 9. Compressed Gas and Air Equipment
Article 76. Compressed Gas and Air Cylinders
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§4649. Construction and Marking of Cylinders.

(a) All portable cylinders used for the storage and shipment of compressed gases shall be constructed and maintained in accordance with the regulations of the U. S. Department of Transportation 49 CFR Parts 171-179.

(b) Compressed gas cylinders shall be equipped with connections that are approved as defined in Section 3206 of the General Industry Safety Orders.

(c) All cylinders with a water weight capacity of over 30 pounds shall be equipped with means of connecting a valve protection device or with a collar or recess to protect the valve.

(d) Compressed gas cylinders shall be legibly marked, for the purpose of identifying the gas content, with either the chemical or the trade name of the gas. Such marking shall be by means of stenciling, stamping, or labeling, and shall not be readily removable. Whenever practical, the marking shall be located on the shoulder of the cylinder.

Note: This method conforms to ANSI Z48.1-1954(R1971), “Method for Marking Portable Compressed Gas Containers to Identify the Material Contained.”

(e) The numbers and markings stamped into cylinders shall not be tampered with.


Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code.


1. Renumbering from Article 76 (Section 4650) to Article 75 (Section 4648) filed 12-19-78; effective thirtieth day thereafter (Register 79, No. 1).

2. New Article 76 (Sections 4649 and 4650) filed 12-19-78; effective thirtieth day thereafter (Register 79, No. 1).

3. Amendment of subsection (c) filed 10-18-79; effective thirtieth day thereafter (Register 79, No. 42).

4. Amendment of subsection (b) filed 1-6-99; operative 2-5-99 (Register 99, No. 2).

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