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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)12.8 LOAD-INDICATING DEVICESa. Load-indicating devices are not required inroutine operations where loads ofknown <strong>and</strong>essentially consistent weight are to beh<strong>and</strong>led.Rather, load-indicating devices are required foruse with loads ofuncertain weight that could bewithin 90-100 percent ofthe rated capacity oftheequipment or maximum working load ofany partofthe tackle. Use load-indicating devices wherethe equipment! tackle configuration could result inbinding or friction ofthe load that could cause agreater stress in the hoist or tackle than wouldresult from the apparent hook load.b. The accuracy ofload-indicating devices shalldepend on the requirements ofthe load systemplanned <strong>and</strong> shall not restrict the systemrequirements; an accuracy of2 percent offull-scale reading within 10-70 percent ofinstrument range is recommended. The deviceshould be selected so that the estimated hook loadlies between 10 <strong>and</strong> 70 percent ofthe instrumentrange.c. Dynamometers commonly have designfactors ofless than 5:1. Any combination wherethe safety {actor ofthe dynamometer times thecapacity ofthe dynamometer divided by the loadequals 5 is acceptable.d. When dynamometers are used asload-bearing parts ofrigging, they must beconstructed to provide a measure ofsafety <strong>and</strong>reliability equal to that ofthe associated rigging,or a safety device must be installed to preventdropping the load in the event ofa failure.12-19Chapter 12<strong>Rigging</strong> Accessories

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