Marine Order 32, issue 3
37Heat treatment
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37 Heat treatment
37.1 The person in charge, the master of the ship or the terminal operator must not permit the use in loading or unloading of a chain, ring, hook, shackle, swivel, connecting plate or overhauling weight that is subject to stress unless it has been examined by a competent person to determine if heat treatment is necessary.
37.2 If heat treatment is necessary, it must be applied under the supervision of a competent person to a process appropriate to its design and material to restore the mechanical properties of the material or to relieve any stress.