(8)Thin walled pressure vessel or plant:(a)(i)As far as possible, in respect of every sizing cylinder of which shall be made of copper sheet or any other non-ferrous material, the Manager shall make available to the Inspector and the competent person examining such cylinders, information to show the date on which such cylinder was taken into use for the first time with full particulars as to the thickness of the shell when so taken into use in the factory. Information shall also be made available as to the safe working pressure, recommended by the manufacturers when such cylinder is taken into use for the first time in the factory.(ii)If no information as aforesaid in the foregoing sub-rule is available, any other evidence relevant to show the age of the cylinder shall be submitted by the Manager. The Chief Inspector shall determine the age of the cylinder on such documentary evidence or other oral evidence that may be presented to him by Manager or any other evidence that may be produced by an Inspector, and the age so determined shall be considered as the age of the cylinder for the purposes of this rule.(b)(i)The minimum thickness of the shell of a sizing cylinder shall be actually measured as and when possible.(ii)If during its working life the shell of a sizing cylinder is at any time punctured requiring repairs to the cylinder to close the punctured portion, the thickness of the sheet of the shell near such puncture of opening shall be measured by a competent person and the record maintained in Form 9.(c)(i)No sizing cylinder shall be subjected to a working pressure greater than the safe working pressure recommended by the manufacturers of such cylinder at the time when such cylinder was first taken into use 11;1 a factory.(ii)The safe working pressure of a sizing cylinder which has been in use for more than five years shall be calculated in accordance with the following three methods and the lowest figure obtained by any of the three methods shall be considered as safe working pressure of a sizing cylinder:
