ASME A90.1 pdf download

ASME A90.1 pdf download Safety Standard for Belt Manlifts
1 GENERAL
1.1 Scope
This Standard applies to the manufacture, installation, maintenance, inspection, and operation of manlifts. Manlifts covered by this scope consist of steps (platforms) and accompanying handholds mounted on, or attached to, an endless belt operating vertically in one direction only and being supported by, and driven through, pulleys at the top and bottom. These manlifts are intended for conveyance of persons only. It is not intended that this scope cover moving stairways, eleva- tors with enclosed platforms (Paternoster elevators), gravity lifts, or conveyors used only for conveying materials.
1.2 Purpose The purpose of this Standard is to establish safety requirements for manlifts. It is intended for use as a standard reference for manlift safety requirements by manufacturers, architects, plant designers, installers, and consulting engineers, and for users of manlifts through voluntary application and for governmental authorities.
1.3 Application
(a) This Standard applies to manlifts used to carry only authorized personnel trained in their use. Manlifts shall not be available to the general public.
(b) Because of the difficulty in enforcing paras.4.2 and 7.1(a), manlifts are not recommended for use on construction sites.
(c) One year after the date of issuance, all provisions of this Standard shall apply to both new and existing installations, except as noted in individual sections.
1.4 Exceptions
In case of practical difficulty or unnecessary hardship, the enforcing authority may grant exceptions from the literal requirements of this Standard or permit the use of alternate methods, but only when it is clearly evident that equal safety is thereby secured.
NOTE: It is suggested that in cases where exceptions are asked for, the enforcing authority consult with The American Society of Mechanical Engineers, Attn: Secretary, A90 Standards Committee, Three Park Avenue, New York, NY 10016-5990.
1.5 Units of Measurement
This Standard contains SI (metric) units as well as Customary units.
The SI units have been directly (softly) converted from the Customary units. 2 REFERENCES This Standard is intended for use in conjunction with the following American National Standards:
3 DEFINITIONS
belt-breaking strength: the amount of tensile load [pounds(Newtons)] applied to a belt causing its fracture.belt travel: the distance between the centers of the topand bottom pulleys when the bottom pulley is at itshighest position.
debris deflector: a protective shield positioned to deflectfalling objects away from the bottom pulley.elevator bolt: a flathead, countersunk elevator bolt asdefined by ASME B18.5-1990, Table 9.factor of safety: the ratio of the tensile strength of thematerial to the allowable stress when a part is subjectedto full-load operation.
handhold (handgrip): a cup-shaped device securelyattached to the belt, which can be grasped by the passen-ger to provide a means for maintaining balance.manlift: a power-driven endless belt that moves in onedirection only, and is provided with steps (platforms)