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

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§473. Gaging Devices.

(a) A permanent dip pipe or a fixed level gage shall be installed in all containers filled by volume and shall be of such length or position that it will indicate when the tank is 86 1/2 percent full.

(1) This fixed dip tube or fixed level gage shall be permanently installed in the tank. Additional dip pipes or fixed level gages may be used providing they are permanently marked to show the outage they indicate.

(b) Each tank 125-gallon capacity or more, filled by volume, shall be equipped with a liquid level gaging device, such as a rotary gage, magnetic gage, or series of fixed pipes, in addition to the fixed dip pipe required in Section 473(a) .

(c) Each tank having an allowable working pressure of less than 250 psi shall have a thermometer well. This Order does not apply to tanks built before January 1, 1946, or to code tanks constructed in accordance with Para-graphs U-68, U-69, and UW-52 (b) for a working pressure of 200 psi or more. The thermometer well shall be plugged or capped when not in use to prevent the entrance of moisture and the resulting hazard of corrosion.

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


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

2. Amendment filed 11-7-75, effective thirtieth day thereafter (Register 75, No. 45).

3. Amendment of section heading and section, including repealer of table 473 and figure 2, and new Note filed 12-4-96; operative 1-3-97 (Register 96, No. 49).

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