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Interpretation

Actual Load Allowed to be Lifted:Is the resultant load derived by applying the hook mode and other mode factors to the SWL marked on the sling so that the prescribed Safety Factor is always maintained.

The "basic configuration": of a sling for test purposes means configuration in its basic form as shown in the diagram below:-

Endless sling

Eye sling

Hook Mode Factor: The mode factor applied to the rated S.W.L. (based on Standard Pin Test) of a sling which is to be used on a curved hook profile that is not more severe than the Standard Hook profile.

Minimum Specified Tensile Strength: The minimum tensile strength for which the sewn webbing component has been designed. This has to be established by the "Standard Pin" test or "Manner of Use" test as required for the purpose of use.

Mode Factor: The factor that takes into account the geometry of the lift assembly, the multiplicity of parts, the appropriate lifting angles and any other stress effects such as choking.

Multi-Use Sling: A sling that is manufactured and approved for continuous general service use.

One-Way Sling: A sling that is manufactured and approved for one series of handling operations.

Pin: A pin is considered to have a straight profile and a load bearing surface which is fully and uniformly radiused over the width of the section of the pin.

Radius of Curvature: The minimum radius of curvature of the inner surface of the load bearing portion of the hook in profile in way of the sling.

Representative Sling: a sling representative of a production run or a batch of slings of the same type. For prototype testing and where reasonable a representative sling may be of different length than the production sling.

Safe Working Load (S.W.L.): means the lifting capacity in basic configuration or manner of use based on the results of the required tests that the sling can be marked for at the time of its manufacture in compliance with the required Safety Factor. In field use all mode factors applicable shall be applied to this rated Safe Working Load to obtain the actual load allowed to be lifted to ensure that the required Safety Factor shall always be maintained during a lift.

Safety Factor: the number of times that the load carried by a sling can be increased, before failure occurs.

Bar Thickness or Section Thickness (T): the maximum thickness of the load bearing surface when viewed in cross section. (In a straight pin the cross section thickness is the diameter).

Standard Pin: means a pin of 1½" diameter, circular in cross section in way of the sling bearing surface.

Standard Hook: means a hook of 1½" bar width, fully radiused cross section, and radius of curvature equal to half the width of the sling for which the hook factor is being evaluated.

Types of Inspections ^

Working Check: Visual check just prior to use by the person using the sling. After inspection the slings may be placed directly on the load.

Dock check: Careful visual inspection by a competent person as required by owner/operator done at the terminal, prior to the time of use by persons working under direction.

Depot Check: Thorough visual inspection as required by owner/operator done by competent person. (Note: The words "depot check", mean checked at the stevedore's locker, or sling maker's shop or at a place run by a person versed in that type of work, in Canada or abroad. A record shall be kept of the check.

Ultimate Tensile Strength (U.T.S.): the maximum force attained by the sewn webbing component when loaded in tension in the prescribed manner for load testing.

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