atc/filer/DNV Standard 2-7-3 May 2011.pdf

Standard for Certification - 2.7-3, May 2011Page 38prevent unwanted opening of the shackle. Other attachment details shall be accepted by DNV on a case by casebasis.The manufacturer shall ensure the quality of procedures and facilities by implementing a Quality ManagementSystem at least in accordance with ISO 9001.7.2 Approval and Certification of Lifting SetsNormally lifting slings (chain or wire rope) and the main components shall be type approved. Type approvalprocedures shall be according to DNV 2.7-1 Annex 1 “Type Approval of Lifting Sets for Offshore Containers”.Before a type approval certificate can be issued, manufacturers of lifting sets and lifting set components willbe audited by DNV. In order to retain the type approval, manufacturers will be audited regularly by DNV.Guidance note 1:The components which require type approval are shackles, chains, links (including master links and master link assembliesintermediate links, end links) and couplings. Wire rope, ferrules and thimbles do not have to be type approved.---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---Product certificates issued by the manufacturer based on their type approval shall be according to 7.5.In special cases DNV may issue product certificates instead of type approval certificates. This procedure maybe used if no type approved products are available or if a manufacturer has not received a type approvalcertificate at the time the products are delivered. Such DNV product certificates may be issued for individualproducts or batches of products.Lifting sets and components shall comply with a recognized standard and with the additional requirementsgiven in this Section. Design, testing and certification shall be according to the specified standard.Guidance note 2:Lifting sets for offshore PO Units approved and certified according to this Section are generally also considered to beloose lifting equipment and this should be reflected in the certificates. Where appropriate, the lifting set should be CEmarked.7.3 Design of lifting sets---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---7.3.1 GeneralSlings shall be rated for their intended angle of use.Normally the sling leg angle from vertical for two, three and four leg slings should be between 45° and 30°.Other sling angles can be accepted by DNV on a case by case basis.In order to facilitate handling and improve safety, it is often advisable to use an extra (top) leg with a ring andor link above the master link. The top link should be sized to facilitate hooking on to a crane forerunner.Guidance note:It is recommended that the master link to be attached to the crane hook should have minimum internal dimensions270 140 mm.---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---The lifting set shall be of sufficient length to allow easy handling by operators. The top link or master link shallbe able to reach down to a height of no more than 1.3 m above the PO Unit bottom when the sling hangs overthe long side of the PO Unit.Where two 2-legged slings are selected to function as a 4-legged sling, they shall be calculated as for a 4-leggedsling. See also 7.6 for special marking requirement.Guidance note:When 2 separate 2-legged slings are used, the angle from vertical is not the same as the angle between the 2 parts.---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---7.3.2 Sling minimum dimensions & MBLThe MBL for wire rope- and chain slings connected to the PO Units lift points are defined by the followingrequirement:MBL 2.0 RSF Where,MBL is the documented Minimum Breaking Load of the sling after any required reductions due to endterminations and bending have been considered. RSF is defined in 3.5.4. For extra top leg slings (forerunners)DET NORSKE VERITAS