Single Chain Sling Two Leg Chain Sling Three Leg Sling Four leg Sling Double Loop Endless Sling Proof Load Testing After final heat treatment slings with accessories shall be tested as an assembly, multi- leg chain slings shall be tested in sections. Individual sections of the chain slings shall be subjected to 2.0 times the load to which the section will be subjected when the assembly is subjected to its working load limit in accordance with the plan. Lifting capacity of sling / working load limit (MT) Rating Single Branch slings Single branch slings shall have a working load limit equal to that of the Chain used in their construction Multi Branch slings Multi branch slings shall be rated at a uniform working load limit for an angle between branches of 90o-120o(45o- 60o to the vertical) or additionally a ta uniform working load limit for any angle between branches of 90o-120o(45o- 60o to the vertical ). Uniform Load Method Double branch slings For all angles between branches from 0°- 90° (0°- 45° to the vertical) WLL = 1.4 x WLL of a single branch made from similar chain. When additionally marked for angles between branches of 90°- 120° (45°- 60° to the vertical) WLL = 1 x WLL of single branch made from similar chain. Three and four branch slings For all angles between branches from 0°- 90° (0°- 45° to the vertical) WLL = 2.1 x WLL of a single branch made from similar chain. When additionally marked for angles between branches of 90°- 120° (45°- 60° to the vertical) WLL = 1.5 x WLL of single branch made from similar chain.