ASME HST-4 pdf free download

ASME HST-4-2016 pdf free download.Performance Standard for Overhead Electric Wire Rope Hoists.
(a) This Standard establishes performance requirements for electric wire rope hoists for vertical lifting service involving material handling of freely suspended (unguided) loads using wire rope with one of the following types of suspension:
(1) lug
(2) hook
(3) trolley
(4) base or deck mounted (does not include base- mounted winches of the type covered by ASM E 1330.7)
(5) wall or ceiling mounted (does not include base- mounted winches of the type covered by ASME 830.7)
(b) This Standard is applicable to hoists manufactured after the 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 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 hoists own wire rope
(6) hoists used for marine and other applications as required by the U.S. Department of Defense (DOD)
(C) The requirements of this Standard shall be applied together with the requirements of ASME B30.16. Please also refer to ASME 133016 for requirements pertaining to marking, construction, and installation; inspection, testing, and maintenance; and operation.
SECTION 4-0.2 DEFINITIONS
almorinal operating cond,tio,zs: environmental conditions that are unfavorable, harmful, or detrimental to the operation of a hoist, such as excessively high or low ambient temperatures; exposure to weather, corrosive fumes, or dust-laden or moisture-laden atmospheres; and hazardous locations.
ambient h’rnpt’raturr: 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.
an overhead standard structural or specially fabricated hape on which the trolley operates.
block, load: the assembly of hook or shackle, swivel, bearing, pins, sheaves, and frame suspended by the rope. This shall include all appurtenances reeved into the hoisting rope.
brake: a device, other than a motor, used for retarding or stopping motion by mnction or power means.
brake, balding: 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. This unidirectional device requires torquc from the motor to lower a load but does not impose additional load on the motor when lifting a load.
braking. control: a method of controlling speed by removing energy from the moving body or by imparting energy in the opposite direction.
braking. count crtorque (plugging); a method of controlling speed by applying a variable motor torque in the direction opposite to the direction that the motor is rotating due to being overhauled by the load.
braking, diinamic: a method of controlling speed by using the motor as a generator, with the energy being dissipated by resistance.
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, rrge7ferntiue: a method of controlling speed in which the electrical energy generated by the motor is fed back into the power system.ASME HST-4 pdf download.