Definition(s)
working load limit <lifting set>
Maximum mass or weight that a lifting component is designed to sustain in lifting service.
Source: API Standard 2CCU, Offshore Cargo Carrying Units, First Edition, August 2017. Global Standards
Working Load Limit
A load value assigned to loose gear by the manufacturer that is a fraction of the breaking load value which should not be exceeded during use of BOP handling systems and equipment.
Source: API SPEC 7K, Drilling and Well Servicing Equipment Upstream Segment, Fifth Edition, June 2010 (August 2010). Global Standards
Source:API SPECIFICATION 7K, Drilling and Well Servicing Equipment, Sixth Edition, December 2015. Global Standards
Working Load Limit
Working Load Limit (WLL) of the interchangeable components refers to the permissible load of these parts (e.g. shackles, hooks, chains, links etc.) without regard to the hoist load and/or dead load coefficient. It should be noted that the Working Load Limit (WLL) of an interchangeable component is not normally identical the Safe Working Load (SWL)
of the lifting appliance, as the components have to be dimensioned in accordance with the local occurring forces. These forces are indicated in the rigging plans.
Source: Rules for Classification and Construction, IV Industrial Services, 6 Offshore Technology, 9 Guideline for Personnel Transfers by Means of Lifting Appliances, Edition 2011, Germanischer Lloyd SE, Global Standards