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Breaking Strength: The point at which a component or assembly will break from stress. The breaking strength is a measure of the component or assemblys ability to carry a load beyond its "working load limit".
Working Load Limit: The maximum allowable load assigned to each synthetic web tie down by the manufacturer which is not to exceed one-third of the complete assembly breaking strength.
NOTE: When designing cargo control solutions; remember, assemblies are only as strong as their weakest component(s).
Aggregate Working Load Limit: The summation of the working load limit (WLL) of all devices used to secure an article(s) on or to a vehicle.
Anchor Point: Part of the structure fitting or attachment on a vehicle or article of cargo to which a tie down is attached.
Proof Load Test: A non-destructive pull test to some multiple of the working load limit (WLL) of an item.
Qualified Person: A person who by posession of a recognized degree, certificate of professional standing or by extensive knowledge, training and experience has successfully demonstrated the ability to solve or resolve problems related to the subject matter and work.
Ratchet: A mechanical device used with synthetic web tie downs to incrementally adjust and tension the webbing.
Selvedge: The narrow edge of woven fabric that runs parallel to the warp.
Splice: The part of a synthetic web tie down that is alapped and sewn, with a stitch pattern determined by the manufacturer, to become an integral part o f the tie down.
Types of splices are:
a. Load-Bearing Splice: Any splice that carries a portion of the total load applied to the tie down.
b. Assembly Splice: Any splice that joins two or more parts of the tie down without bearing an of the applied loads.
Securement System: A means to secure cargo, to include a synthetic web tie down and vehicle anchor points.
Synthetic Fiber: Man-made fibers.
Synthetic Webbing: A fabric, woven of high tenacity synthetic yarns offering suitable characteristics for use in the manufacture of synthetic web tie downs. Reference the WSTDA Recommended Standard Specification for synthetic Webbing used for Tie Downs WSTDA-T-4.
Synthetic Yarn: The fiber that is used to make webbing and thread.
Tenstile Load: The force being applied expressed in pounds or kilograms.
Thread: The synthetic yarn that is used to sew a stitch pattern.
Tie Down: An assembly fabricated of synthetioc webbing, with or without hardware, for the purpose of securing cargo.
Vehicle: Any device for carrying goods or equipment, such as a truck, trailer, van, or otherwise.
Warp: The set of yarn in all woven fabrics that run lengthwise and parallel to the selvedge and is interwoven with te filling.
Web Width: The distance across the webbing from outer selvedge to outer selvedge.
Winch: A Tensioning device, which is mounted directly to the vehicle for tensioning synthetic web tie downs used to secure cargo. Reference the WSTDA Recommended Standard Specifications for Winches Used With Synthetic Web Tie Downs WSTDA-T-3.
Yarn: A synthetic fiber that is used to make webbing ahnd thread.
Web Sling and Tie Down Association. (2005). from Recommended standard specification for synthetic web tie downs. (2nd rev.). Bel Air, Maryland.
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