ASME A90.1:2003 pdf free download

ASME A90.1:2003 pdf free download.SAFETY STANDARD FOR BEIT MANLIFTS.
ASME A90.1 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 lop and bottom. These manlifts are intended for conveyance of persons only. It is not intended that this scope cover moving stairways, elevators 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 manhifts. 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 consthiction 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. Secretary, A90 Standards Committee, Three Park Avenue, Nw York, NY 100I6-5990
5 MECHANICAL REQUIREMENTS
5.1 MachInes
5.1.1 Types. Machines shall be the direct-connected type. Cast-iron gears shall not be used. There shall be no 90 deg shoulders machined onto any shaft in manlift machines or pulleys.
EXCEPTION: Existing multiple V-belt drive systems are permii Me. All new rnSL*HatiOnIi shell be the direct-connected type. When one V4,elt replaced, all belts shall be replaced.
5.1.2 Brake
(a) A mechanically applied, electrically released brake shall be provided. The brake shall be capable of stopping and holding the manlift when the down-side is loaded with 200 lb (90 kg) on each step
(b) All new belt manlifts and complete drive assernblics shall be equipped with a mechanically-applied, manually-released brake that will prevent free-wheeling of the head pulley and/or head pulley shaft due to couple. shafting, or reducer failure. This brake when applied shall cut off the power to the manlift motor and prevent rotation of the head pulley and/or head pulley shaft.
5.2 Belt
5.2.1 MateriaL The material shall be laminated belting. solid-woven PVC belting, or other belting meeting the strength requirements of para. 5.2.3.lt shall have a coefficient of friction such that when used in conjunction with an adequate tension device, it will meet the brake test specified in para. 5.1.2.
5.2.2 WIdth. Belts shall meet Rubber Manufacturers Association (RMA) tolerances for width. The minimum tolerances shall be as follows (see Table 2).
(a) New installations. The width of the belt shall be
not less than 14 in. (355 mm) for a travel not exceeding
150 ft (46 rn), and 16 in. (4( mm) for a travel exceeding
150 ft (46 m) for new manhft installations.
(b) Existing Installations. The width of the belt may be Less than those dimensions specified in para. 5.2.2(a), but never less than 12 in. (305 mm).