ASME B30.20-2010 pdf download

ASME B30.20-2010 pdf download.Below-the-Hook Lifting Devices.
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.
porous material: a material that is permeable by fluid. seal ring (seal): that part of the vacuum pad which forms the seal of the vacuum chamber between the vacuum pad body or vacuum lifting device and the attached material. 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 involves opera- tion other than normal, heavy, or severe. single-pad mechanical vacuum lifter: see Fig. 20-0.4-1, illustration (b). two-pad mechanical vacuum lifter: see Fig. 20-0.4-1, illustration (a). vacuum: pressure less than ambient atmospheric pressure. vacuum lifter: a below-the-hook lifting device for lifting and transporting loads using a holding force by means of vacuum (see Fig. 20-0.4-1). vacuum manipulator: a vacuum lifter capable of reposi- tioning the load while suspended. vacuum pad: a device that applies a holding force on the load by means of vacuum. vacuum reservoir: the evacuated portion of the vacuum system that functions to compensate for leakage into the vacuum system or to provide a vacuum reserve in the event of vacuum generator failure.
magnet, lifting, general application: lifting magnets that are intended by the manufacturer to be used on a number of different geometrical shapes and do not fall under the category of remotely operated lifting magnets. magnet, lifting, remotely operated: a lifting magnet that does not require the operator or other personnel to be in close proximity to the lifting magnet or its load while the lifting magnet is in use. magnet, lifting, specified application: lifting magnets that are designed for lifting specified geometrical configura- tions and weights of designated parts, identified by part number or other controlled definition and used in a controlled manner. service, heavy: service that involves operation within the rated load limit that exceeds the limits ofnormal service. service, normal: service that involves operation with vari- ous weights within the rated load limit, averaging less than 65% of rated load (capacity) with the magnet operating at, or below, the rated duty cycle over one shift (8 hr). service, severe: service that involves normal or heavy ser- vice with abnormal operating conditions. service, special or infrequent: service that involves opera- tion other than normal, heavy, or severe. test, application breakaway force: a test that is carried out in accordance with instructions from the manufacturer ofthe lifting magnet in order to establish the application breakaway force. test, breakaway force: a test that is carried out per para. 20-3.3.8.2 in order to establish the rated breakaway force.