ASME HST-3:2022 pdf download

ASME HST-3:2022 pdf download.Performance Standard for Lever Hoists
(a) This Standard establishes performance requirements for chain, wire rope, and web strap lever hoists for lifting, pulling, and tensioning applications (see Figures 3-0.1-1 through 3-0.1-4). (b) The specifications and information in this Standard apply to lever hoists of the following types: (1) ratchet-and-pawl operation with (-a) roller-type load chain lifting medium (-b) welded-link-type load chain lifting medium (-c) web-strap-type lifting medium (-d) wire-rope-type lifting medium (2) friction-brake operation with (-a) roller-type load chain (-b) welded-link-type load chain (-c) web-strap-type lifting medium (-d) wire-rope-type lifting medium (c) Specially insulated lever hoists designed for handling high-voltage lines are not covered by this Standard. (d) This Standard is applicable to hoists manufactured afterthe date on which this Standard is issued. 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 marine and other applications as required by the Department of Defense (DOD) unless Nonmandatory Appendix A has been invoked. The requirements of this Standard shall be applied together with the requirements of ASME B30.21. Refer to ASME B30.21 for requirements pertaining to marking, construction, installation, inspection, testing, maintenance, and opera- tion.
abnormaloperating conditions: environmental conditions thatare unfavorable, harmful, or detrimental to the operation ofa hoist, such as excessively high or low ambient temperatures; exposure to weather, corrosive fumes, dust-laden or moisture-laden atmospheres; and hazardous locations. brake: adevice, otherthan amotor, usedforretardingorstoppingmotionofthe loadbyfriction orpowermeans (see also load-controlling mechanism). hazardous (classified) locations: locations where fire or explosion hazards may exist. Locations are classified depending on the properties of the flammable vapors, liquids, 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 ANSI/NFPA 70). headroom (closedheight): the distance between the saddle ofthe suspension hookand the saddle ofthe load hookwhen the load hook is in its fully retracted position (see Figure 3-0.1-1). idler sprocket: a freely rotating device that changes the direction of the load chain, rope, or web strap. lever hoist: a manually lever-operated device used to lift, lower, or pull a load and to apply or release tension. leverpull: the average force, lbf(kN), exerted bythe operatoratthe end ofthe operatinglever(handle) to liftorpull rated load.
lift: the maximum vertical distance through which the load hook can travel; it is the total hook movement between its upper limit of travel and its position at the lower limit of travel (see Figure 3-0.1-1). liftingdevices: devices thatare notnormallyreevedonto the hoistrope, web strap, orchain, suchas supplemental devices used for handling or attaching to the load. The weight ofthese devices is to be considered part ofthe load to be lifted. lifting medium: the chain, wire rope, or web strap used by the lever hoist to apply a force or support the load. load: the total superimposed force on the hoist load block or load hook, including lifting devices. loadblock: the assembly ofhook or shackle, swivel, bearings, sheaves, sprockets, pins, and frame suspended by the load chain, rope, or web strap. This shall include any appurtenances reeved into the load chain, rope, or web strap. load chain: the load-bearing chain in the hoist. rollerchain: a series ofalternatelyassembled rollerlinks and pin links in which pins articulate inside the bushings and rollers are free to turn on the bushings. Pins and bushings are press-fit in their respective link plates. welded-link chain: a chain consisting of interwoven links formed and welded. NOTE: Load-chain properties do not conform to those shown in ASME B30.9. load-controlling mechanism: a mechanism that functions automatically to hold and control the load. In each of the following general types, a reciprocating force must be applied to the hoist lever to lower the load: friction-brake type: an automatic type of brake used for holding and controlling loads. This unidirectional device requires a force applied to the operating lever to lower the load but does not impose additional lever pull when lifting the load.