ASME HST-2:2018 pdf download

ASME HST-2:2018 pdf download.Performance Standard for Hand Chain Manually Operated Chain Hoists
(a) This Standard establishes performance requirements for hand chain manually operated chain hoists for vertical lifting service involving material handling offreely suspended (unguided) loads, using welded link type load chain as a lifting medium, with one of the following types of suspension: (1) hook or clevis (2) trolley (b) This Standard is applicable to hoists manufactured after the date on which this Standard is issued. Differential pulley and self-locking worm drive type hoists are not covered in this Standard. (c) This Standard is not applicable to (1) damaged or malfunctioning hoists (2) 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 lifting or supporting people (5) hoists used for the purpose of drawing both the load and the hoist up or down the hoist’s own load chain (6) hoists used in applications where the load on the hand chain hoist is not freely suspended from the hand chain hoist Therequirements ofthis Standardshallbeappliedtogetherwiththerequirements ofASME B30.16. Pleasealso referto ASME B30.16 for requirements pertaining to marking, construction, installation, inspection, testing, maintenance, and operation.
ambient temperature: the temperature of the atmosphere surrounding the hoist. beam: an overhead standard structural shape or specially fabricated shape on which a trolley operates. chain, hand: the chain provided to control movement of a hand-chain-operated hoist or trolley (see Figure 2-0.2-1). NOTE: Hand chain and load chain properties do not conform to those shown in ASME B30.9. chain, load: the load-bearing chain in the hoist. NOTE: Hand chain and load chain properties do not conform to those shown in ASME B30.9. conditions, abnormal operating: environmental conditions that are unfavorable, harmful, or detrimental to or for the operation ofa hoist, such as excessively high or low ambienttemperatures, exposure to weather, corrosive fumes, dust- laden or moisture-laden atmospheres, and hazardous locations. conditions, normal operating: conditions during which a hoist is performing functions within the scope of the original design. handchain drop: the distance to the lowestpointofthe hand chain measured from the saddle ofthe load hookatits upper limit of travel (see Figure 2-0.2-1). hand chain overhaul: the number of feet (meters) the hand chain must travel to raise the load hook 1 ft (1 m). handchain pull: the average force measured in pounds (kilonewtons) exerted bythe operator on the hoisthand chain to lift the rated load. handchain wheel: a wheel with formed pockets on its peripheryto allowtorque to be transmitted when a force is applied to the hand chain.
hazardous (classified) locations: locations where fire or explosion hazards may exist. Locations are classified depending on the properties ofthe flammable vapors, liquids, or gases, or combustible dust or fibers that may be present, and the likelihood that a flammable or combustible concentration or quantity is present. Refer to NFPA 70. headroom: headroom is measured with the load hookatits upperlimitoftravel, and is the distance from the saddle ofthe load hook to the following (see Figure 2-0.2-1): (a) saddle of the top hook on hook-suspended hoists (b) saddle of clevis on clevis-suspended hoists (c) wheel treadline on trolley-suspended hoists hoist, hand-chain-operated: a suspended machineryunitthat, byuse ofmanual operation, is used for liftingor loweringa freely suspended (unguided) load. (a) hoist, clevis-suspended: a hoist suspended by means ofa clevis or eye at the top ofthe hoist (see Figure 2-0.2-1). (b) hoist, hook-suspended: suspension ofa hoist from a trolley or rigid structure by means ofa hook at the top ofthe hoist (see Figure 2-0.2-1). (c) hoist, trolley-suspended: a hoistsuspended from a trolley. Ahoistcan be connected to a trolleybyhookor clevis, or the hoist can be integral with the trolley (see Figure 2-0.2-1). hooklatch: a mechanical device to close (bridge) the throat opening ofa hook; a rigging aid not intended to support the load.