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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)7.1 GENERALOverhead <strong>and</strong> gantry cranes include top-runningsingle- or multiple-girder bridge with top-runningtrolley hoists (Figure 7-1), top-runningsingle-girder bridge with underhung trolley hoists(Figure 7-2), <strong>and</strong> monorails/underhung cranes(Figure 7-3).7.1.1Operators ofoverhead cranes shall be trained <strong>and</strong>qualified as required in Chapter 6, "PersonnelQualification <strong>and</strong> Training."7.1.2Operator Training!QualificationRated-Load MarkingThe rated capacity shall be marked on each side ofthe crane. Ifthe crane has more than one hoistingunit, each hoist shall have its rated capacitymarked on it or on its load block Markings on thebridge, trolley, <strong>and</strong> load block shall be legiblefrom the ground or floor.7.1.3ModificationCranes may be modified or rerated provided thatthe modifications or supporting structures areanalyzed thoroughly by a qualified engineer or bya manufacturer ofcranes. Modifications <strong>and</strong>reratings must be approved by the cognizantsafety organization. A rerated crane, or one whoseload-supporting components have been modified,shall be tested in accordance with Section 7.3,"Testing." The new rated capacity shall bedisplayed in accordance with Section 7.1.2,"Rated-Load Marking."7.1.4EgressOn cab-operated cranes, there shall be at least twomeans ofegress from the crane, remote from eachother, <strong>and</strong> arranged to permit departure underemergency conditions.7.1.5Hoist Brakesa. Each independent hoisting unit shall beequipped with at least one holding brake applieddirectly to the motor shaft or some part ofthe geartrain.b. Each independent hoisting unit (exceptworm-geared hoists, the angle ofwhose wormprevents the load from accelerating as it is beinglowered) shall be equipped with acontrolled-braking means in addition to theholding brake to control speed oflowering.c. Holding brakes on hoists shall be appliedautomatically when power is removed.7.1.6Power Shutoffa. The power supply for the runway conductorsshall be controlled by a switch or circuit-breakerlocated on a fixed structure, accessible from thefloor, <strong>and</strong> capable ofbeing locked in the OPENposition.b. On cab-operated cranes, an enclosed switchor circuit-breaker (with provisions for locking inthe OPEN position) shall be provided in the leadsfrom the runway conductors. A means of openingthis device shall be located within reach oftheoperator when the operator is in the operatingposition. When the operator opens this switch orcircuit-breaker, the holding brakes should set.c. On floor, remote, or pulpit-operated cranes,an enclosed disconnect device shall be provided inthe leads from the runway conductors.· Thisdevice shall be mounted on the bridge or footwalknear the runway collectors. There shall beprovisions for locking the device in the OPENposition unless the crane is the only load on alockable switch or circuit-breaker that isaccessible from the floor. One of the followingtypes offloor, remote, <strong>and</strong> pulpit-operateddisconnects shall be provided.1. A nonconductive rope attached to themain disconnect device on a floor-operated crane.Ifthis is selected, the rope shall be suspendedadjacent to the operating ropes ifmanualcontrollers are used, or near the pendantpush-button station ifmagnetic controls are used.2. An under-voltage trip for a maincircuit-breaker, operated by an emergency stopbutton in the pendant push-button station or thepulpit.7-1Chapter]Overhead <strong>and</strong> Gantry Cranes

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