ASME HST-4 pdf free download

ASME HST-4 pdf free download Performance Standard for Overhead Electric Wire Rope Hoists
SECTION 4-0.1: sCOPE
(a} This Standard establishes performance requirements for electric wire rope hoists for vertical lifting service in-volving material handling of freely suspended (unguided) loads using wire rope with one of the following types ofsuspension:
1) lug(2) hook(3) trolley
(4) base or deck mounted (does not include base-mounted winches of the type covered by ASME B30.7)(5] wall or ceiling mounted (does not include base-mounted winches of the type covered by ASME B30.7)(bj This Standard is applicable to hoists manufactured after the date on which this Standard is issued.This Standard isnot applicable to
1) damaged or malfunctioning hoists
(2y hoists that have been misused or abused
(3 hoists that have been altered without authorization of the manufacturer or a qualified person(4) hoists used for the purpose of lifting or lowering people
(5) hoists used for the purpose of drawing both the load and the hoist up or down the hoist’s own wire rope(6) hoists used for marine and other applications as required by the U.S. Department of Defense (DOD) unlessNonmandatory Appendix A is invoked
(c) The requirements of this Standard shall be applied together with the requirements of ASME B30.16.Please alsorefer to ASME B30.16 for requirements pertaining to marking, construction, and installation; inspection, testing, andmaintenance; and operation.
SECTION 4-0.2:DEFINITIONS
abnormal operating conditions: environmental conditions that are unfavorable, harmful, or detrimental to the operationof a hoist, such as excessively high or low ambient temperatures; exposure to weather,corrosive fumes, dust-laden ormoisture-laden atmospheres; and hazardous locations.
ambient temperature: the temperature of the atmosphere surrounding the hoist.
base or deck mounted: a type of mounting where the hoist is mounted to the top side of a horizontal supporting surface.beam: an overhead standard structural or specially fabricated shape on which the trolley operates.
block, load: the assembly of hook or shackle,swivel, bearing, pins, sheaves, and frame suspended by the rope.This shallinclude all appurtenances reeved into the hoisting rope.
brake: a device, other than a motor,used for retarding or stopping motion by friction or power means.
brake, holding: a friction brake for a hoist that is automatically applied and prevents motion when power is off.brake, mechanical load: an automatic type of friction brake used for controlling loads in a lowering direction. Thisunidirectional device requires torque from the motor to lower a load but does not impose additional load on themotor when lifting a load. A mechanical load brake may also be used as a holding brake if designed as such bythe manufacturer.
braking, control: a method of controlling speed by removing energy from the moving body or by imparting energy in theopposite direction.
braking, countertorque (plugging): a method of controlling speed by applying a variable motor torque in the directionopposite to the direction that the motor is rotating as it is being overhauled by the load.
braking, dynamic: a method of controlling speed by using the motor as a generator, with the energy being dssipated byresistance.
braking, eddy current: a method of controlling or reducing speed by means of an electrical induction load brake.braking, mechanical: a method of controlling or reducing speed by friction.
braking, regenerative: a method of controllingspeed in which the electricalenergy generated bythe motoris fed backintothe power system.
ceiling mounted: a type of hoist mounting where the hoist is mounted to the underside ofa horizontal supporting-surfac.chain, hand: the chain provided to control movement of a hand-chain-operated trolley.
contactor: an electromechanical device for opening and closing an electric power circuit.
control: a device or group of devices that serves to govern in some predetermined manner the power delivered to theapparatus to which it is connected.
control actuator: a manual means at the operating station by which hoist or trolley controls are energized.control enclosure: the housing containing the electrical control components.
cushioned start: an electrical or mechanical method for reducing the rate of acceleration of trolley motion.drum: the cylindrical member around which the rope is wound for lifting and lowering the load.
hazardous (classified) locations: locations where fire or explosion hazards may exist.Locations are classified dependingon the properties of the flammable vapors, liquids, or gases, or combustible dusts or fibers that may be present, and thelikelihood that a flammable or combustible concentration or quantity is present (refer to ANSI/NFPA 70).
headroom: headroom is measured with the load hook at its upper limit of travel and is the distance from the saddle of theload hook to the following locations (see Figure 4-0.2-1):
(a) centerline of the suspension holes on lug suspended hoists(b) saddle of the top hook on hook-suspended hoists
(c) wheel tread line on trolley-suspended hoists
(d) supporting surface on base-, deck-, and ceiling-mounted hoists(e) uppermost point of hoist on wall- and ceiling-mounted hoists
hoist: machinery unit that is used for lifting or lowering a freely suspended (unguided) load.hoist speed: the rate of motion that the load hook obtains while lifting a rated load.
hook suspended: suspension of the hoist from a trolley or rigid structure by means of a hook(s) at top of hoist.lateral hook travel: the lateral movement of the load hook between its position at the upper limit of travel and its positionat the lower limit of travel.
lift: the maximum vertical distance through which the load hook can travel; it is the total hook movement between itsupper limit of travel and its position at the lower limit of travel (see Figure 4-0.2-1).
lifting devices, below-the-hook: devices that are not normally reeved onto the hoist ropes, such as hook-on-buckets,magnets, grabs, and other supplemental devices used for handing certain types of loads. The weight of thesedevices is to be considered part of the load to be lifted.
limit device: a device that limits equipment motion or takes control of particular functions without action of the operatorwhen a limiting condition is reached.
load hook: the hook used to connect the load to the hoist.