ASME A90.1-2009 pdf free download.Safety Standard for Belt Manlifts.
rated speed: the speed of the belt at which the manlift is designed to run (refer to para. 5.4).
safety stop device: any electrical or electromechanical device (such as a limit switch, photoelectric eye, or proximity probe) that shall cause the electric power to he removed from the driving machine motor and brake stopping the manlift.
severe belt damage: the protective outer cover of a belt that becomes cut, cracked, or separated, exposing damaged inner fabric, and such damage that extends across the full width of the belt or spans between adjacent bolt holes. A torn belt is also considered severe.
split-rail safety stop: an electric limit switch operated mechanically by the rollers on the manlift steps.
step (platform): a passenger carrying unit.
superficial belt cover damage: the protective outer cover of a belt that becomes scratched, cut, or cracked, exposing the inner fabric. Such damage is not continuous across the full width of the belt.
torn: a severance of any length or width that goes through the entire thickness of the belt.
4 GENERAL REQUIREMENTS
4.1 Floor Openings
4.1.1 Allowable Size. New installations shall have minimum floor openings of 30 in. (760 mm) and maximum floor openings of 36 in. (915 mm). Floor opening widths for both the up- and down-runs for existing installations shall be in accordance with Table 1 and Fig. 1.
4.1.2 Uniformity. All floor openings for a given manlift shall be uniform in size and shall be approximately circular, and each shall be located vertically above the opening below it.
4.2 Riding Clearance
(a) There shall be no encroachment of any kind within the cylindrical space defined by the outer edges of the floor openings for the entire run of the manlift.
(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.
4.3.1 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 at least one edge (one, two, or three) of the floor opening used for mounting and dismounting (see Fig. 2, 3, or 4 for typical landing spaces).
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 standard railings and toeboards.
(c) Platforms constructed to give access to bucket elevators 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. 5):
(a) Slope. 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. (1118 mm) outward from the face of the belt. It shall not extend beyond the upper surface of the floor above.