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Subchapter 7. General Industry Safety Orders
Group 20. Flammable Liquids, Gases and Vapors
Article 141. Container and Portable Tank Storage

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§5532. Design, Construction, and Capacity of Containers.

(a) Only approved containers and portable tanks shall be used. Metal containers and portable tanks meeting the requirements of and containing products authorized by Chapter 1, Title 49, of the Code of Federal Regulations (DOT Regulations), or NFPA No. 386, Standard for Portable Shipping Tanks, shall be deemed to be acceptable.

(b) Each portable tank shall be provided with one or more devices installed in the top with sufficient emergency venting capacity to limit internal pressure under fire exposure conditions to 10 psig, or 30 percent of the bursting pressure of the tank, whichever is greater. The total venting capacity shall be not less than that specified in Subsections 5593(d) or (f). At least one pressure-actuated vent having a minimum capacity of 6,000 cu. ft. of free air per hour (14.7 psia and 60o F) shall be used. It shall be set to open at not less than 5 psig. If fusible vents are used, they shall be actuated by elements that operate at a temperature not exceeding 300 F. When used for paints, drying oils, and similar materials where plugging of the pressure-actuated vent may occur, fusible vents or vents of the type that soften to failure at a maximum of 300 F. under fire exposure, may be used for the entire emergency venting requirement.

(c) Containers and portable tanks for flammable and combustible liquids shall conform to Table FL-2.


(1) Medicines, beverages, foodstuffs, cosmetics, and other common consumer items, when packaged according to commonly accepted practices, shall be exempt from the requirements of 5532(a).

(2) Class IA and Class IB flammable liquids may be stored in glass containers of not more than one-gallon (3.78 l.) capacity if the required liquid purity (such as ACS analytical reagent grade or higher) would be affected by storage in metal containers or if the liquid would cause excessive corrosion of the metal container.

                        Table FL-2

                   |                          |
                   |   Flammable liquids      | Combustible liquids
  Container type   |__________________________|____________________
                   |        |        |        |        |
                   | Class  | Class  | Class  | Class  | Class
                   |   IA   |   IB   |   IC   |   II   |  III
                   |        |        |        |        |
Glass..............|   1 pt |   1 qt |  1 gal |  1 gal |  1 gal.
                   | (472ml)| (945ml)| (3.78l)| (3.78l)| (18.9l)                 
Metal (other than  |        |        |        |        |
  DOT drums)or     |        |        |        |        |                         
  approved plastic.|  1 gal |  5 gal |  5 gal |  5 gal |  5 gal.     
Safety cans........|  2 gal |  5 gal |  5 gal |  5 gal |  5 gal.
Metal drums (DOT   |        |        |        |        |
  specifications)..| 60 gal | 60 gal | 60 gal | 60 gal |  60 gal.
Approved portable  |        |        |        |        |
  tanks............|660 gal |660 gal |660 gal |660 gal | 660 gal.

NOTE: Authority and reference cited: Section 142.3, Labor Code.


1. Editorial correction of subsection (c)(2) and Table FL-2 filed 12-9-82 (Register 82, No. 50).

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