ASME B30.20:2010 pdf download

ASME B30.20:2010 pdf download.Below-the-Hook Lifting Devices
administrative or regulatory authority: governmental agency, or the employer in the absence of governmental jurisdiction. alteration: a physical change, addition, or deletion that modifies the original design, or intended functioning, of the below-the-hook lifting device. altered: see alteration. appointed: assigned specific responsibilities by the employer or the employer’s representative. authorized: appointed by a duly constituted administra- tive or regulatory authority. below-the-hook lifting device: a device used for attaching loads to a hoist. The device may contain components such as slings, hooks, and rigging hardware addressed by other ASME B30 volumes or other standards. design category: lifter classification that specifies the design factor to be used to establish static stress limits for the design. designated person: a person selected or assigned by the employerorthe employer’s representative as beingcom- petent to perform specific duties.hoist: a machinery unit that is used for lifting and lowering. lifter: see below-the-hook lifting device. lifting device: see below-the-hook lifting device. modification: see alteration. modified: see alteration. normal operating conditions: conditions during which the lifter is performing functions within the scope of the original design. qualified person: a person who, by possession of a recog- nized degree in an applicable field or certificate of pro- fessional standing, or who, by extensive knowledge, training, and experience, has successfully demonstrated the ability to solve or resolve problems relating to the subject matter and work. rated load: the maximum load for which the equipment is designated by the manufacturer. repair: the process of reconditioning, renewal, or replace- ment of parts, components, and/or subsystems to a con- ditionequalto the original manufacturer’s specifications for the purpose of ensuring performance in accordance with the applicable requirements. service class: lifter classification that establishes the allowable stress range for the specified fatigue life (load cycles). shall: indicates that the rule is mandatory and must be followed. should: indicates that the rule is a recommendation, the advisability of which depends on the facts in each situation.
friction-type pressure-gripping lifters: lifters that grip the load withoutsignificantor harmful permanentdeforma- tion of the load surface (see Fig. 20-0.3-1). grip ratio: the ratio of the sum of the horizontal forces on one side of the load to the live weight of the load. For example, if the total horizontal force on one side of the load is 100,000 lb and the live load is 50,000 lb, the grip ratio is 2. For purposes of this calculation, the weight of the load does not include the weight of the lifter (see Fig. 20-0.3-2). indentation-type pressure-gripping lifters: lifters that carry the load by applying force to indent the sides of the load (see Fig. 20-0.3-3). ingot turnover grab: a manipulating lifter [Fig. 20-0.3-4, illustration (e)]. latch: a device for holding a lifter in the open or closed position. latch, automatic: a sequencing latch mechanism operated by lifter motion. lifting beam (spreader beam): a load-supporting lifter [see Fig. 20-0.3-5, illustration (a)]. lock bar sheet lifter: a supporting lifter [see Fig. 20-0.3-5, illustration (j)]. manipulating lifter: a lifter that rotates the load about one or more axes during the lifting process (see Fig. 20-0.3-4). mechanical lifting device: a mechanism composed of two or more rigid parts which move with respect to each other for attaching a load to a hoisting device. service, heavy: service that involves operation within the rated load limit that exceeds the limits ofnormal service. service, normal: Design Category A lifters (for ASME BTH-1): service that involves operation with various weights within the rated load limit with not more than four operations above 65% of the rated load limit per 24-hr period. Design Category B lifters (for ASME BTH-1): service that involves operationwithvarious weights withinthe rated load limit, averaging less than 65% of rated load limit. service, severe: service that involves normal or heavy ser- vice with abnormal operating conditions. service, special or infrequent: service that