ASME A120.1-2008 pdf download

ASME A120.1-2008 pdf download.Safety Requirements for Powered Platforms and Traveling Ladders and Gantries for Building Maintenance.
1 GENERAL RECOMMENDATIONS AND DEFINITIONS 1.1 Scope This Standard establishes safety requirements for powered platforms (scaffolds) for buildings where win- dow cleaning and related services are accomplished by means of suspended equipment at heights in excess of 35 ft (11 m) above a safe surface (e.g., grade, street, floor, or roof level). Additionally, this Standard establishes safety requirements for permanent traveling ladders and gantries (TLG). It pertains to either permanently installed or trans- portable equipment meeting the requirements of this Standard. Powered platforms and TLGs maybe used oroperated by one or more persons engaged in services such as normal building maintenance. The equipment may also be used for tasks such as caulking, metal polishing, reglazing, or other building repairs. This Standard does not apply to other suspended powered platforms used for remedial renovations or modifications to buildings. The safe use of these scaf- folds is included in ANSI A10.8-2001, Safety Requirements for Scaffolding. This Standard doesnotrelate toanyservice performed by persons supported by equipment covered by any of the ANSI A92 standards. 1.2 Purpose The purpose of this Standard is to ensure the protec- tion of powered platform users and traveling ladder and gantry users, and persons exposed to equipment used with the previously described maintenance ofbuildings. It is also intended for use by architects, engineers, designers, manufacturers, inspectors, purchasers, build- ingowners, andothers associated withtheinstallationof powered platforms and traveling ladders and gantries. Additionally, it is recommended for use by enforce- ment agencies having jurisdiction over the installation ofpowered platforms and traveling ladders and gantries to ensure that the platforms meet the safety provisions of this Standard. 1 1.3 Application of This Standard 1.3.1 Applications. This Standard applies to the installation of all powered platforms and traveling lad- ders and gantries. 1.3.2 Deviations. Deviations from the requirements ofthis Standard may be granted by the enforcing author- ity if it is determined that a specific requirement creates practical difficulty or excessive hardship, or where the specific requirement prevents the use of a novel design, only when equivalent safety is provided. 1.3.3 Alterations (a) Any existing building being serviced may con- tinue to be serviced until the building is altered, requir- ing a modification of the installation. Alteration of the building and equipment modification shall then be made to comply with the applicable parts of this Standard. (b) If the authority having jurisdiction believes that hazards exist to warrant a change in an existing installa- tion, the authority may require compliance with any part of this Standard. If a qualified person deems that a hazard exists, the hazard shall be corrected, and the correction shall be in compliance with this Standard. (c) Once a building permit is issued or modified, the current version of the Standard shall apply. 1.4 Applicable Units This editionofthe Standard uses U.S. Customaryunits with acceptable metric (SI) units shown in parentheses. NOTE: The metric values stated may not be exact equivalents to the U.S. Customary units. Information on the usage of SI units and their conver- sionfromU.S. Customaryunits is contained inthe IEEE/ ASTM SI 10-1997, Standard for the Use of the Interna- tional System of Units (SI): The Modern Metric System; or ASME Guide SI-1, Orientation and Guide for Use of SI (Metric) Units. 1.5 References When a nationally recognized standard, other than that specifically referred to in para. 1.1, is referred to and is superseded by a revision, the edition current at the time of acceptance of this Standard shall apply.
reverse bend: a reverse bend in a wire rope is one where a rope bends around one sheave followed by bending around a second sheave in the opposite direction. rope lay length: the length, parallel to the longitudinal axis, in which a wire makes one complete turn about the axis of the strand or a strand about the axis of a rope. In this connection it is also referred to as lay length or pitch. safe surface: a horizontal surface intended to be occupied by personnel, which is so protected that it can be reason- ably assured that said occupants will be protected against injury or from falling. self-powered platform: a powered platform where the hoist(s) is located on the platform. shall: mandatory. should: advisory. single wrap (layer) drum hoist: a type of winding drum hoist that accumulates the suspension wire rope in a single layer on the surface of the hoisting drum. speed reducer: a positive-type speed-reducing machine. stability factor: the ratio of the stabilizing moment to the overturning moment. strain reliefanchor: a positive device used for the mechan- ical anchorage of cable to prevent undue strain on the cable connectors.