Michigan Administrative Code
Department - Labor and Economic Opportunity
MIOSHA
General Industry and Construction Safety and Occupational Health Standards
General Industry Safety Standards
Part 12 - WELDING AND CUTTING
CONFINED SPACES
Section R. 408.11213 - Working in confined spaces

(1) When working in a confined space, the torch valves and the gas supply valve and oxygen valve outside the confined space shall be shut off during lunch, overnight, or for any other prolonged period. Where practicable, the torch and hose shall be removed from the confined space.

(2) When stick electrodes are used in a confined space, and welding is suspended during lunch, overnight, or for any other prolonged period, the electrode shall be removed from the holder and the machine shut off.

(3) The air in a confined space shall be tested with an approved device and purged, if necessary, before any entry. Ventilation shall be provided in the confined space when an employee is present.

(4) A cylinder or welding power source used in a confined space shall be placed and secured on the outside of the space where work is being performed.

(5) An employee who is trained in rescue procedures, and with such equipment as is necessary to effect a rescue, if needed, shall be stationed outside the confined space during welding or cutting operations. An employer shall ensure that an effective means of communication is established between employees in the confined space and the attendant. When safety belts and lifelines are used, they shall be provided and used as prescribed in general industry safety standard Part 33 "Personal Protective Equipment," as referenced in R 408.11202, and attached to the welder's body so that his or her body cannot be jammed in a small exit opening.

(6) After welding operations are completed in a confined space, a sign or other warning shall be used to mark the hot metal.