Section 70(a) in The Orissa Building and Others Construction Workers (Regulation of Employment and Conditions of Service) Rules, 2002
(a)all chains other than bridle chains attached to derricks and all rings, hooks, shackles and swivels used in hoisting or lowering of such derricks are effectively annealed under supervision of a competent person and at the following intervals namely :-(i)Such chains, rings, hooks, shackles an swivels which are not more than twelve and a half millimeter of length are so annealed at least once in every six months; and(ii)All other such chains, rings, hooks, shackles and swivels are so annealed at least once in every twelve months;
