ASME A90.1-2003 pdf download

ASME A90.1-2003 pdf download.SAFETY STANDARD FOR BELT MAIiILIFTS.
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 (plat- forms) 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, eleya- tors with enclosed platforms (Paternoster elevators), gravity lifts, or conveyors used only for conveying mate- rials. 1.2 Purpose 1.5 Units of Measurement (03) 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. ANSI A12.1-1973, Safety Requirements for Floor and Wall Openings, Railings, and Toeboards ANSI A14.3-1984, Safety Requirements for Fixed Ladders Publisher: American National Standards Institute (ANSI), 25 West 43rd Street, New York, NY 10036 ASME B15.1-2000, Safety Standard for Mechanical Power Transmission Apparatus 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 B18.5-1990, Round Head Bolts Publisher: The American Society of Mechanical Engi- neers (ASME International), Three Park Avenue, New York, NY 10016-5990; Order Department: 22 Law Drive, Box 2300, Fairfield, NJ 07007-2300 authonties. 1.3 Application (a) This Standard applies to manlifts used to carry only authorized personnel trained in their use. Manhfts shall not be available to the general public. (b) Because of the difficulty in enforcing paras. 4.2 and 7.l(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 Ln 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, Secretary, A90 Standards Committee, Three Park Avenue, New York, NY 10016-5990. NFPA 70-1984, National Electrical Code Publisher: National Fire Protection Association (NFPA), 1 Batterymarch Park, Quincy, MA 02269-9101 3 DEFINITIONS belt-breuking strength: the amount of tensile load [pounds (Newtons)J applied to a belt causing its fracture. belt travel: the distance between the centers of the top and bottom pulleys when the bottom pulley is at its highest position. debris deflector: a protective shield positioned to deflect falling objects away from the bottom pulley. elevator bolt: a flathead countersunk elevator bolt as defined by ASME B18.5-1990, Table 9. factor of safety: the ratio of the tensile strength of the material to the allowable stress when a part is subjected to full-load operation. handhold (handgrip): a cup-shaped device securely attached 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 one direction only, and is provided with steps (platforms)
(b) Should maintenance or construction work be planned for in close proximity to the manlift causing an encroachment on the space defined in para. 4.2(a), the manlift shall be shut down during such work. 4.3 Landings 4.3.1 Vertical Clearance. The clearance between the floor or mounting platform and the lower edge for the underfloor hood above it required by para. 4.4 shall be not less than 7 ft 6 in. (2 285 mm). Where this clearance cannot be obtained, no access to the manlift shall be provided, and the manlift runway shall be enclosed where it passes through such floor. The enclosure shall be equipped with an emergency exit. 4.3.2 Clear Landing Space. The landing space adja- cent to the floor openings shall be free from obstruction and kept clear at all times. The landing space shall be at least 2 ft (610 mm) in width from the edge of the floor opening used for mounting and dismounting (see Figs. 2 and 3). 4.3.3 Lighting of Landings. Adequate lighting, not less than 5 fc (54 lx), shall be provided at each floor landing at all times when the lift is in operation. 4.3.4 Landing Surface. The landing surface at the entrances and exits to the manlift shall be constructed and maintained to provide safe footing at all times. 4.3.5 Emergency Landings. Where there is a travel of 50 ft (15 m) or more between floor landings, one or more emergency landing(s) shall be provided so that there is a landing (either floor or emergency) for every 25 ft (7.5 m) or less of manlift travel. (a) Emergency landings shall be accessible from both the up- and down-runs of the manlift and shall give access to the ladder as required in para. 4.8. (b) Emergency landings shall be provided with stan- dard raiiings and toeboards. (c) Platforms constnicted to give access to bucket ele- vators or other equipment for the purpose of inspection, lubrication, and repair may also serve as emergency landings under this paragraph. All such platforms shall then be considered part of the emergency landing and provided with standard railings and toeboards. 4.4 Hoods on Underside of Floor Openings 4.4.1 Fixed Type. On the up-side of the manlift floor, openings shall be provided with an underfloor hood meeting the following requirements (see Fig. 4). (a) SZope. The underfloor hood shall make an angle of not less than 45 deg with the horizontal. (b) Extent. The lower edge of this hood shall extend at least 44 in. (1 1 1 8 mm) outward írom the face of the belt. It shall not extend beyond the upper surface of the floor above.