DOE-STD-1090-96, DOE Standard Hoisting and Rigging Manual ...

DOE·STD·I090·96 (Rev-I)q. Never hammer a sling to straighten a spiralor cross rod or to force a spiral into position.r. Metal-mesh slings used in pairs should beattached to a spreader beam.s. Ensure that all metal-mesh slings have apermanently affixed metal identification tag ortags containing the following information:1. Manufacturer's name or trademark.2. Rated load in vertical, basket, andchoker hitches.3. Inspection due date.11.3.5 Synthetic-Web Slingsa. Synthetic web shall possess the followingqualities:1. Be ofsufficient strength to meet thesling manufacturer's requirements.2. Have uniform thickness and width.3. Have selvage edges and not be splitfrom its woven width.b. The thread used in the manufacture of asynthetic-web sling shall be ofthe same type ofmaterial as the web.c. Fittings shall be:1. Of sufficient strength to sustain twicethe rated capacity without permanent deformation.2. Of a minimum breaking strength equalto that ofthe sling.3. Free ofall sharp edges that would inany way damage the mesh.d. The stitching in all load-bearing splices shallbeofsufficient strength to maintain the slingdesign factor.e. Synthetic-web slings may be coated withelastomers or other suitable material that willprovide characteristics such as abrasionresistance, sealing ofpores, and increasedcoefficient offriction.f. The design factor for synthetic-web slingsshall be a minimum of5:1 based upon breakingstrength.g. Rated.capacities are affected by the type ofhitch used and by the angle from the vertical whenused as multilegged slings or in basket hitches.The sling manufacturer shall supply data on theseeffects.h. Synthetic-web slings are available in anumber ofconfigurations as follows (see Figure11-17):1. Endless or Grommet Sling-Bothends ofone piece ofwebbing are lapped and sewnto form a continuous piece. They can be used asvertical hitches, bridle hitches, in chokerarrangements, or as basket slings. Because loadcontact points can be shifted with every lift, wearis evenly distributed and sling life is extended.2. Standard Eye and Eye-Webbing isassembled and sewn to form a flat-body sling withan eye at each end and the eye openings in thesame plane as the sling body. The eyes may eitherbe full web width or may be tapered by beingfolded and sewn to a width narrower than thewebbing width.3. Twisted Eye-An eye-and-eye typethat has twisted terminations at both ends. Theeye openings are at 90 degrees to the plane ofthesling body. This configuration is also availablewith either full-width or tapered eyes.i. In place of the sewn eyes, synthetic-webslings are also available with metal end fittings(see Figure 11-18). The most common aretriangle and choker hardware. Combinationhardware consists ofa triangle for one end ofthesling and a triangle/rectangle choker attachmentfor the other end. With this arrangement, bothchoker and basket hitches, as well as straighthitches, may be rigged. They help reduce wear inthe sling eyes and thus lengthen sling life.Chapter 11Wire Rope and Slings 11-30