ASME HST-2:2018 pdf free download

ASME HST-2:2018 pdf free download Performance Standard for Hand Chain Manually Operated Chain Hoists
SECTION 2-0.1: scOPE
(a) This Standard establishes performance requirements for hand chain manually operated chain hoists for verticallifting service involving material handling of freely suspended (unguided) loads, using welded link type load chain as alifting 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. Differentialpulley 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 chainhoist
The requirements of thisStandard shall be applied together with the requirements of ASMEB30.16.Please also refer toASME B30.16 for requirements pertaining to marking, construction, installation, inspection, testing, maintenance, andoperation.
sECTION 2-0.2:DEFINITIONS
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 theoperation of a hoist, such as excessively high or low ambient temperatures, 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 originaldesign.
hand chain drop: the distance to the lowest point of the hand chain measured from the saddle of the load hookatitsupperlimit 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).hand chain pull:the average force measured in pounds (kilonewtons) exerted by the operator on the hoist hand chain tolift the rated load.
hand chain wheel: a wheel with formed pockets on its periphery to allow torque to be transmitted when a force is appliedto the hand chain.
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 dust or fibers that may be present, and thelikelihood that a flammable or combustible concentration or quantity is present.Refer to NFPA 70.
headroom: headroom is measured with the load hookat its upper limit of travel, and is the distance from the saddle of theload hook to the following (see Figure 2-0.2-1):
(a) saddle of the top hook on hook-suspended hoistsb) saddle of clevis on clevis-suspended hoists
c) wheel treadline on trolley-suspended hoists
hoist, hand-chain-operated: a suspended machinery unit that, by use of manual operation, is used for lifting or lowering afreely suspended (unguided) load.
(aj hoist, clevis-suspended: a hoist suspended by means of a clevis or eye at the top of the hoist (see Figure 2-0.2-1).(by hoist, hook-suspended: suspension of a hoist from a trolley or rigid structure by means of a hook at the top of thehoist (see Figure 2-0.2-1).
(c) hoist, trolley-suspended: a hoist suspended from a trolley.A hoist can be connected to a trolley by hook or clevis, orthe hoist can be integral with the trolley (see Figure 2-0.2-1).
hook latch: a mechanical device to close (bridge) the throat opening of a hook; a rigging aid not intended to support theload.
lift: the maximum vertical distance through which the load hook can travel, and is the total allowable hook movementbetween its upper limit of travel and its lower limit of travel (see Figure 2-0.2-1).
lifting devices, below-the-hook: devices that are not normally reeved onto the hoist chains, such as hook-on buckets,magnets,grabs,and othersupplementaldevices used for hanging or attachingto the load.The weight ofthese devicesis tobe considered part of the load to be lifted.
load: the total superimposed weight on the load block or load hook, including lifting devices.
load block: the assembly of hook or shackle, swivel, bearing, pins,sprocket,and frame suspended by the load chain.Thisshall include all appurtenances reeved into the load chain.
load hook: the hook used to connect the load to the hoist.
load sprocket a hoist component that transmits motion to the load chain.This component is sometimes called load wheel,load sheave, pocket wheel, chain wheel, or lift wheel.
load suspension parts: the means of suspension (trolley, hook or clevis), the chain, the sprocket(s), the structure orhousing that supports the sprocket(s), and the load block.
minimum radius: the smallest radius of the beam, measured to the centerline ofthe web ofthe beam,on which the trolywill operate.
overload: any load greater than the rated load.
parts (lines): number of lines of chain supporting the load block or hook.
qualified person: a person who, by possession of a recognized degree in an applicable field or a certificate of professionalstanding. or by extensive knowiledge, training, and experience, has successfully demonstrated the ability to solve orresolve problems relating to the subject matter and work.