There are many factors that contribute to the successful rigging and handling of materials. The Lifting gear user shall be trained in the selection, inspection, cautions to personnel, effects to the environment and rigging practice. We do assist in the selection of lifting equipment to assure the best possible product when requested.
LETS LOOK AT SOME OF THESE IMPORTANT ENGINEERING CALCULATIONS
1. MAXIMUM LOAD LIMIT: also referred to as Safe Working Limit(SWL), Safe Working Load(SWL), Working Load Limit(WLL), Rated Load Value(RLV)etc. assigned each product supplied by AP Lifting reflects the engineering evaluation of the manufacturer and should never be exceeded regardless of the size or strength of the lifting gears being used.
2. PROOF LOAD LIMIT, DESIGN FACTOR OR SAFETY FACTOR: This factor is the maximum load to which a product may be subjected before physical deformation occurs. It is the maximum load to be applied in the performance of a load test. All products supplied by AP Lifting (except when noted) have a proof load limit or safety factor as designed by the manufacturer which is always required by lifting equipment legislation.
3. PROOF LOAD TEST: A straight axial load applied under controlled laboratory conditions upon customer’s request. The proof load limit should never be considered as an allowable extension of the maximum load limit. The maximum load limits must never be exceeded in the actual use of any lifting gear.
4. SHOCK LOAD: A dynamic increase in the load factor caused by the sudden take up of slack, shifting, jerking, or impacting to the load or equipment supporting the load.
5. YIELD POINT: The point between proof load limit and the ultimate load at which permanent deformation occurs. Note that this deformation may not be visible.
6. ULTIMATE LOAD OR BREAKING LOAD: A theoretical value, the load at which a product will fail or will no longer support a load.