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Subchapter 1. Unfired Pressure Vessel Safety Orders
Article 5. LP-Gas Systems.

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§489. Warning Signs.

(a) All containers in excess of 125 gallons, except transportation containers and fuel containers on motor vehicles, shall have the word “FLAMMABLE” on each side that is readily visible. The letters of this sign shall be in standard-type letters and shall have a height of at least 1/12 of the diameter of the container, but need not be in excess of 1 1/2 inches for containers of 500 gallons capacity or less or 4 inches for containers exceeding 500 gallons capacity.

(b) Warning signs with the words “NO SMOKING, OPEN FLAMES OR OTHER SOURCE OF IGNITION PERMITTED WITHIN ______ FEET” shall be applied in letters at least 1 1/2 inches high, in sharply contrasting colors, on each stationary container or on a sign posted adjacent to the container. This sign shall also be posted adjacent to all loading and unloading terminals located more than 50 feet from the container.

(c) When 2 or more containers are installed in battery, the requirement of Sections 489 (a) and (b) will be considered as being complied with when the required warning signs are prominently displayed on all 4 sides of such battery of containers.

Note: The distance shall be that shown on the following table:

Volumetric capacity of Containers
(in U.S. gallons)

Minimum distance from source of ignition

125 to 500 inclusive

10 feet

501 to 2,000 inclusive

25 feet

Over 2,000

50 feet

(d) The warning signs required in Section 489(b) shall be posted on each exterior wall of each room or building used for filling or storage of cylinders.

(e) When LP-Gas and one or more other gases are stored or used in the same area, the containers shall be marked to identify their content. Markings shall be in compliance with ANSI Z48.1- 1992,"Method of Marking Portable Compressed Gas Containers To Identify the Material Contained."

Note: Authority cited: Section 142.3, Labor Code. Reference: Section 142.3, Labor Code; and Section 13241, Health and Safety Code.


1. Amendment of subsection (a) filed 5-4-77 as an emergency; effective upon filing (Register 77, No. 19). For prior history, see Register 76, No. 32.

2. Amendment of subsection (a) filed 8-18-77; effective thirtieth day thereafter (Register 77, No. 34.)

3. Amendment of section and new Note filed 12-4-96; operative 1-3-97 (Register 96, No. 49).

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