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Subchapter 7. General Industry Safety Orders
Group 10. Gas Systems for Welding and Cutting
Article 82. Stationary Automatic Acetylene Generators

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§4812. Maintenance and Operation.

(a) Relief valves shall be tested in accordance with the manufacturer's recommendation to insure proper functioning. Relief valves for generating chambers shall be set to open at a pressure not in excess of 15 p.s.i.g. Relief valves for hydraulic back-pressure valves shall be set to open at a pressure not in excess of 20 p.s.i.g.

(b) The carbide added each time the generator is charged shall be no more than sufficient to refill the space provided for carbide without ramming the charge. Only wooden, brass or other nonferrous tools shall be used in distributing the charge, or in making any other adjustments on generators or in generator houses or rooms.

(c) At least 1 fire extinguisher of not less than 10B:C rating, listed by the Underwriters' Laboratories or other recognized authority of equivalent standing, shall be kept available for service and in good working order near the generator house or room.

(d) Whenever a person is inside a generator, another person shall be stationed outside the generator to assist in case of emergency. The person in the generator shall be provided with, and shall wear an approved life line and belt. In addition, there shall be provided a suitable ladder giving access to the interior of the generator.

(e) Flash lights used in the generator room or storage building shall be Bureau of Mines permissible type or equivalent.

(f) Nonautomatic generators shall not be used for generating acetylene at pressures exceeding 1 p.s.i.g., and all water overflows shall be visible.

(g) Generator water chambers shall be kept filled to proper level at all times except while draining during the recharging operation.

Whenever repairs are to be made or the generator is to be charged or carbide is to be removed, the water chamber shall be filled to the proper level.

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


1. Amendment of subsection (a) and new subsections (h) and (i) filed 5-16-75; effective thirtieth day thereafter (Register 75, No. 20).

2. Amendment of subsection (e) filed 3-2-76; effective thirtieth day thereafter (Register 76, No. 10).

3. Amendment filed 6-12-87; operative 7-12-87 (Register 87, No. 26).

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