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Subchapter 1. Unfired Pressure Vessel Safety Orders
Article 2. Design and Construction

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§454. Design and Construction of Air Tanks.

(a) Except as permitted in Section 454(b) all air tanks for new installations shall be constructed, inspected and stamped in compliance with the ASME Code (unless the design, material, and construction of the air tank are accepted by the Division as equivalent to the ASME Code) and, except for "UM" vessels, registered with the National Board of Boiler and Pressure Vessel Inspectors. The stamping on all new air tanks or on nameplates attached thereto shall show the head and shell thickness in addition to the stamping required by the ASME Code.

(b) Air tanks used for self-contained breathing apparatus may be constructed in accordance with the ASME Code or DOT specifications provided they are inspected and maintained as required by DOT specifications and do not exceed a volumetric capacity of 1 cubic foot.

(c) The allowable working pressure of any existing air tank shall be determined by the provisions of the ASME Code effective when the tank was manufactured and upon its condition; provided, however, that tanks constructed to other than ASME Code standards for air pressure service shall be calculated with a factor of safety of not less than 5.

(d) Air brake tanks shall be constructed in accordance with the ASME Code or SAE standard J-10b, 1981 Edition.

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


1. Amendment filed 12-8-72 as procedural arid organizational; effective upon filing (Register 72, No. 50).

2. Amendment of subsection (a) filed 4-1-77; effective thirtieth day thereafter (Register 77, No. 14).

3. Amendment filed 1-5-88; operative 2-4-88 (Register 88, No. 4).

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