WEB TIE DOWNS DRAFT - wstda.com

1 RECOMMENDED STANDARD SPECIFICATIONWSTDA-T-1 2013 WEB SLING & TIE DOWN ASSOCIATION, TIE DOWNS $ Web Sling & Tie Down Association. All rights reserved. No part of this publication may beproduced, stored in a retrieval system, or transmitted, in any form or by any means, electronic,mechanical, photocopying, recording or otherwise, without the prior permission of the Web Sling& Tie Down Association. This publication is circulated subject to the condition that it shall not,by way of trade or otherwise, be lent, sold, hired out or otherwise circulated without WSTDA'sprior Recommended Standard Specification applies to web tie DOWNS made of nylon or polyesterfibers used for securing cargo.

2 It recommends construction, identification and marking of theseweb tie DOWNS . In addition, it provides tie down capacity information and important practicaladvice on the use, maintenance and inspection of web tie exclusion from this Recommended Standard Specification of web tie DOWNS of differentmaterials and capacities is not intended to preclude their use and shall not be interpreted in tie DOWNS made from materials or construction other than those detailed in thisRecommended Standard Specification shall be used in accordance with the recommendations ofthe tie down manufacturer or qualified person. The specifications contained in thisRecommended Standard Specification for Web Tie DOWNS were formulated under the auspices ofthe Web Sling & Tie Down Association, Inc.

3 This Recommended Standard Specification isintended to assist users in specifying the proper synthetic web tie down for their particular needs,to serve as a guide to the industry in the construction and use of web tie DOWNS and to serve as aguide to governmental and other regulatory bodies responsible for the proper use and inspectionof synthetic web tie is the paramount consideration involved in the use of any web tie down. The appropriateweb tie down shall be selected for their specific application. Users of web tie DOWNS shall haveknowledge and training on the proper method of cargo securement. Also, users shall beknowledgeable about industry, local, state, federal and provincial regulations applicable to SLING & TIE DOWN ASSOCIATION, Laurel Bush Road, Suite 201 Bel Air, Maryland 21015 Phone (443) 640-1070 Fax (443) 640-1031 Email: Published and Copyright 1991 First Revision 1998 Second Revision 2005 Third Revision 2013 MANDATORY AND ADVISORY RULESM andatory rules of the Recommended Standard Specification arecharacterized by the use of the word shall or must.

4 If a rule is of an advisory nature, it is indicated by the use of the word should , or it is stated as a AND of OF NYLON OR POLYESTER WEB TIE Load PROCEDURES FOR of Testing OPERATING Down Planning :Examples of WSTDA Warning Tag & safety BulletinAdditional ResourcesDRAFTCHAPTER AND OF chapter provides a description of web tie DOWNS and definitions that apply to suchtie web tie down is fabricated of nylon or polyester yarn, woven, and with or withouthardware, for the purpose of securing StrapFigure 1-1 Ratchet StrapFigure 1-2 Logistic StrapFigure 1-3 Figure 1-4 ABRASIONThe mechanical wearing or scuffing of a surface resulting from frictionalmovement between two materials or WORKING LOAD LIMITThe summation of the working load limit (WLL)

5 Of all devices used to secure an article of cargo on a POINTPart of the structure, fitting or attachment point on a vehicle or articleof cargo that should have an identifiable, rated working load limit to which a tie down isattached. (See Figure 1-4)DRAFT2 PROOF LOAD TESTA non-destructive load test of the web tie down to a multiple of oneand one half ( ) times the working load limit (WLL) of that web tie down includinghardware if STRENGTHThe result of a destructive tensile load test expressed in poundsand/or kilograms at which point any load-bearing part of a web tie down finish applied for a special FACTORThe ratio of the breaking strength to the working load limit (WLL) foreach new web tie down, 3:1.

6 Also phrased as the work load limit (WLL) is 1/3 minimumbreaking strength (MBS).DESIGNATED PERSONNELS elected or assigned by the employer or employer srepresentative as being a competent person who is knowledgeable of regulations, standards,capable of assessing risk, identifying predictable hazards and is authorized to take measurement of stretch at a given tensile load, expressed as apercentage of the original, slackened length. All materials subjected to tension will stretchand different materials have different rates of stretch at the same tensile load-bearing device that is attached to the web tie DOWNS . (See Figure 1-5)Figure 1-5 Figure 1-6 MANDRELThe component of a winch and ratchet which the webbing is inserted into fortensioning the web tie down.

7 (See Figure 1-6)MandrelFIBERA synthetic filament capable of being spun into TIE DOWNA tie down that goes from an anchor point on the vehicle, through,over or around the cargo and then attaches to another anchor point on the TIE DOWNA tie down that goes from an anchor point on the vehicle to anattachment point on an article of fabric, woven of high tenacity yarns offering suitable characteristics for usein the manufacture of web tie DOWNS . Reference the WSTDA Recommended StandardSpecification for Webbing used for Tie DOWNS yarn that is used to sew a stitch device for carrying goods or equipment, such as a truck, trailer, van DOWNAny combination of fittings, webbing and tensioners forming an assemblythat attaches to vehicle anchor points.

8 They are used for securing articles of cargo to avehicle or restraining articles of cargo from movement on a vehicle. (See Figure 1-8)Figure 1-8 TENSIONING DEVICEThe mechanical component of a tie down that applies or maintainsforce and incrementally adjusts webbing. Winches, Ratchets, Cams & Over Center Bucklesare commonly used.(See Figure 1-7)Figure 1-7 MandrelWINCHA mechanical tensioner mounted to a vehicle by welding, bolting or a tracksystem. Reference the WSTDA Recommended Standard Specifications for WinchesUsed With Web Tie DOWNS LOAD LIMITThe maximum allowable loading force for each web tie of fibers which are used to make webbing and & CONSTRUCTION OF NYLONOR POLYESTER WEB TIE chapter provides an outline of materials and construction characteristics of web tie shall conform to the WSTDA Recommended Standard Specification for WebbingUsed For Tie DOWNS thread used in the sewing of synthetic web tie DOWNS shall conform to the WSTDAR ecommended Standard Specification for Synthetic Sewing Threads for slings and TieDowns shall be lock-stitched and

9 Preferably continuous. When not continuous,stitching shall be back-stitched at the ends to prevent (FITTINGS & BUCKLES) section relates to the hardware, of metal or other suitable materials, which may beattached to the web tie down for the purpose of securing cargo. The hardware may bea permanent or detachable part of the tie -The hardware material selected shall be compatible with the mechanical andenvironmental requirements imposed on the -Surfaces shall be cleanly finished and edges shall have sufficient radii to preventcutting or other forms of damage to the tie Criteria -Hardware shall have a minimum design factor of 3:1 and havesufficient strength to sustain a proof load test of times the WLL without causingany permanent of Hardware -Hardware shall be inspected prior to reuse.

10 Hardware shall not bereused if excessive wear, pitting, corrosion, cracks, distortion and/or breaks are repairs shall be Load Test -Synthetic web tie DOWNS incorporating reused hardware shall be prooftested to a minimum of one and one half ( ) times the working load limit (WLL) of thesynthetic web tie down finishes or coatings that are applied to the tie down materials shall be compatiblewith the material of the webbing or fittings and shall not impair the performance of thetie down FACTORThe tie down design factor is based on destructive, laboratory controlled testingconditions, which will not be exactly duplicated during actual loading load any tie down in excess of its working load limit (WLL).