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ISO 16856:2013 pdf free

ISO 16856:2013 pdf free.Ships and marine technology一Loose gear of lifting appliances on ships一Hooks
ISO 16856 specifies the types and basic parameters, technical requirements, marking,storage, and transportation, use and maintenance of hooks as loose gear of lifting appliances on ships.
ISO 16856 is applicable to lifting appliances on ships.
The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 1837, Lifting hooks一Nomenclature
ISO 16855, Ships and marine technology一Loose gear oflifting appliances on ships一General requirements
When the design temperature of lifting appliances on ships is below -10℃, the impact energy test temperature of hook materials shall satisfy the requirements of related organizations, such as classification societies.
The forging ratio of forged pieces shall be no less than 3 during the use of steel ingot and no less than 1,5 during the use of steel billet.
Heat treatment must be made after hook forging to achieve the properties specified in 5.1, with no more than three times of heat treatment.The surface of hooks shall be smooth and clean, without any defect such as burrs, cracks, folding,and burning.
Inside hooks, there shall be no cracks, fish eyes, or other defects such as impurities that affect their safe use. For other defects, such as impurities, allowed to exist, the following provisions shall be met:for single defects, the equivalent diameter shall be no more than 5 mm; for scattered defects, it is expected that the equivalent diameter shall be no more than 3 mm and the distributed length shall be no more than 30 mm.
Every hook shall be proof tested, with test loads given in Table 3. Proof load shall be applied to each hook with a testing machine or test weight for a duration of not less than 5 min.
For hooks (type or SWL, materials) beyond common types, strength shall be calculated during the design. The calculations of hook stress are checked based on the curved beam theory, in which the safety factor of the allowable stress to the yield limit of materials is no less than 1,55. Commercially available forged hooks that meet industry standards in terms of SWL, design factor, forging reduction,heat treatment, testing, and inspection are acceptable as agreed on by the supplier and the purchaser.ISO 16856 pdf download.

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