Section 65(5)(c) in Maharashtra Factories Rules, 1963
(c)(i)No sizing cylinder shall be subjected to work at a pressure greater than the maximum safe working pressure recommended by the makers of such cylinder at the time when such cylinder was first put to use in a factory.(ii)No sizing cylinder which has been in use for more than five years shall be subjected to work at a pressure greater than the lowest of the most safe working pressure calculated in accordance with the following three methods, namely:-