ASME B30.20:2003 pdf free download – BELOW-THE-HOOK LIFTING DEVICES
This Standard is one of a series of safety standards on various subjects that have been formulated under the generalauspices ofthe AmericanNational Standards Institute. One purpose of the Standard is to serve as a guide to governmental authorities having jurisdiction over subjects within the scope of the Standard. It is expected, however, that the Standard will find a major application in industry, serving as a guide to manufac- turers, purchasers, and users of the equipment. For the convenience of the user, the Standard has been divided into separate volumes.
If these standards are adopted for governmental use, the references to other national codes and standards in the specific volumes may be changed to refer to the corresponding regulations of the governmental author- ities. The use of cableways, cranes, derricks, hoists, hooks, jacks, and slings is subject to certain hazards that cannot be met by mechanical means but only by the exercise of intelligence, care, and common sense. It is therefore essential to have personnel involved in the use and oper- ation of equipment who are competent, careful, physi- cally and mentally qualified, and trained in the safe operation of the equipment and the handling of the loads. Serious hazards are overloading, droppingorslip- pingofthe load caused byimproper hitchingorslinging, obstructingthe free passage ofthe load,andusingequip- ment for a purpose for which it was not intended or designed. The Standards Committee fully realizes the impor- tance of proper design factors, minimum or maximum sizes, and other limiting dimensions of wire rope or chain and their fastenings, sheaves, sprockets, drums, and similar equipment covered by the Standard, all of which are closely connected with safety. Sizes, strengths, and similar criteria depend on many different factors, often varying with the installation and uses. These fac- tors depend on the condition of the equipment or mate- rial; the loads; the acceleration or speed of the ropes, chains, sheaves, sprockets, or drums; the type of attach- ments; the number, size, and arrangement of sheaves or other parts; environmental conditions causing corrosion or wear; and many variables that must be considered in each individual case. The rules given in the Standard must be interpreted accordingly, and judgment must be used in determining their application.
This Standard applies to the construction, installation, operation, inspection, and maintenance of jacks; power- operated cranes, monorails, and crane runways; power- operated and manually operated derricks and hoists; lifting devices, hooks, and slings; and cableways. This Standard does not apply to track and automotive jacks, railway or automobile wrecking cranes, shipboard cranes, shipboard cargo-handling equipment, well- drilling derricks, skip hoists, mine hoists, truck body hoists, car or barge pullers, conveyors, excavating equip- ment, or equipment falling within the scope of the fol- lowing Committees: A10, A17, A90, A92, A120, B20, B56, and B77.