R 408.11212 General requirements.

Rule 1212. (1) A mixture of fuel gas with air or oxygen shall not be permitted except when consumed at a burner or torch. (2) Only apparatus designed for use with fuel gas or oxygen shall be used for welding or cutting. (3) The total volume of acetylene used per hour shall not exceed 1/7 of the total volume of the acetylene supply in the system. (4) Liquid acetylene shall not be used. (5) A cylinder to which a regulator is attached shall not be moved unless secured to a hand truck or powered truck designed or equipped for this purpose. (6) A cylinder valve shall be closed in all of the following situations: (a) When the cylinder is moved. (b) When the work is finished or is left unattended during lunch, overnight, or for any other prolonged period. (c) When the cylinder is empty. (d) When the regulator is removed. (7) Fuel gas shall not flow from a cylinder or manifold through a torch or other device equipped with a shutoff valve unless the pressure is reduced by a regulator attached to the cylinder or manifold. (8) An oxygen cylinder, cylinder valve, coupling regulator, hose, and apparatus shall be kept free from oily or greasy substances and shall not be handled with oily hands or gloves. Precautions shall be taken to prevent a jet of oxygen from striking an oily surface or greasy clothes or from entering a fuel, oil, or other storage tank. (9) Oxygen shall not be used as a substitute for compressed air or for any other use, except for welding or cutting or life support procedures. (10) Welders shall place welding cable and other equipment so that it is clear of passageways, ladders, and stairways or it shall be protected against damage or hazards to an employee. CONFINED SPACES