39. Examination of dissolved acetylene cylinders before filling
.-Whenever a cylinder is charged with acetylene, it shall be subjected to a thorough visual examination in accordance with IS: 8433, if the history of the cylinder shows that it has not been subjected to such an examination within the previous two years and at the same time the valves shall be removed and the condition of the porous substance at the neck of the cylinder ascertained:Provided that this period of periodical examination shall be one year in case the cylinders are filled with loose porous mass.
