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

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

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

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<strong>DOE</strong>-<strong>STD</strong>-I090-<strong>96</strong> (Rev-I)8.1.9Web StrapThe following applies for manual-lever-operatedhoists:a Web strap should be nylon, polyester, orsimilar synthetic material.b. Ifa load is supported by more than one partofweb strap, the tension on the parts shall beequalized.c. End terminations shall be done in themanner specified by the manufacturer oftheassembly or the web strap.d. Eyes shall be made in a mannerrecommended by the hoist manufacturer or aqualified person.e. Nylon <strong>and</strong> polyester web straps shall not beexposed to an ambient temperature greater than200 degrees F (93 degrees C).f. The web strap shall be attached to the hoistin a manner to prevent disengagement throughoutrated hook travel; no less than two wraps of webstrap shall remain on the hoist load sprocket(drum) when the hook is extended to its full ratedlift.8.1.10 Overtravel Protection8.1.10.1 Upper-Limit Switches/DevicesFor electric- or air-powered hoists, the hoist shallbe designed <strong>and</strong> constructed so that the load hook,either loaded or empty, shall not exceed the upperlimit of travel. In lieu ofa limit switch, amechanism such as a slip clutch maybe used.8.1.10.2 Lower-Limit Switches/Devicesa. For electric- or air-powered hoists, the hoistshall not be installed where, during normaloperating conditions, the hook can be loweredbeyond rated hook travel unless the hoist isequipped with a lower-limit device. Lower-limitdevices should beprovided for hoists where theload block enters pits or hatchways in the floor.b. For h<strong>and</strong>-chain-operated <strong>and</strong>manual-lever-operated hoists, before the loadchain can be completely run out ofthe hoist, itshall be restrained in its fully extended position.The restraint shall be such that the unloaded hoistcan withst<strong>and</strong> a lowering h<strong>and</strong> chain or operatinglever force equivalent to twice the pull required tolift the rated load, or with the rated load on thehoist, a h<strong>and</strong> chain or operating lever forceequivalent to the pull required to lift the ratedload.8.1.11 Travel Warning DevicesOn cab- <strong>and</strong> remote-operated carriers, an audibleor visual warning means shall be provided, unlessit is impossible for personnel to work on the floorbelow the hoist.8.1.12 SupportSupport structures, including trolleys <strong>and</strong>monorails, shall have a rated capacity at leastequal to that ofthe hoist.8.1.13 LocationThehoist shall be installed only in locations thatwill permit the operator to remain clear ofthe loadat all times.8.1.14 Load RatingThe rated capacity shall not be exceeded exceptfor properly authorized tests.8-7Chapter 8Hoists

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