Section 408.40713. Working in confined spaces.

(1) Before the start of a welding operation in a confined space, the employer shall ensure that the atmosphere is tested and recorded. Ventilation shall be provided and maintained in accordance with the requirements of the department of licensing and regulatory affairs.

(2)    For specific confined space rules, see Construction Safety Standard Part 35 “Confined Space in Construction.” as referenced in R 408.40709.

(3)   When working in a confined space, the torch valves, the gas supply valve, and oxygen valve outside the confined space shall be shut off during the lunch period, overnight, or during any other prolonged period and the torch and hose shall be removed from the confined space. Open-end fuel gas and oxygen hoses shall be immediately removed from enclosed spaces when they are disconnected from the torch or other gas- consuming device.

(4)   When electrodes are used in a confined space and welding is suspended during the lunch period, overnight, or during any other prolonged period, the electrode shall be removed from the holder and the machine shall be shut off. The holders shall be placed or protected so that they cannot make electrical contact with employees or conducting objects.

(5)   A gas cylinder or a welding machine used for welding operations in a confined space shall be placed on the outside of the space where work is being performed.

(6)   If an employee must enter a confined space through a small opening to perform welding operations, another employee trained in rescue procedures and equipped with the means necessary to effect a rescue shall be stationed outside the confined space in position to watch the welder. When a safety harness and lifeline are used, they shall be provided for as prescribed in Construction Safety Standard Part 45 “Fall Protection,” as referenced in R 408.40709, and shall be attached to the welder's body so that his or her body cannot be jammed in a small exit opening.

History: 1980 AACS; 1982 AACS; 1996 AACS; 2005 AACS; 2015 MR 4, Eff. March 3, 2015; 2015 AACS.