ASME B30.20:2003 pdf download BELOW-THE-HOOK LIFTING DEVICES
SECTION 20-0.1: SCOPE OF ASME B30.20
Volume B30.20 includes provisions that apply to themarking, construction, installation, inspection, testingmaintenance,and operation of below-the-hook liftingdevices, other than slings, used for attaching loads tohoist. The devices are arranged in five chapters asfollows:
Chapter 20-1:Structural and Mechanical Lifting
Devices
Chapter 20-2Vacuum Lifting DevicesChapter 20-3:Close Proximity Operated LiftingMagnetsChapter 20-4:Remotely Operated Lifting MagnetsChapter 20-5:Scrap and Material HandlingGrapples
SECTION 20-0.2: DEFINITIONS – GENERAL
administrative or regulatory authority: governmentalagency, or the employer in the absence of governmentaljurisdiction.
appointed: assigned specific responsibilities by theemployer or the employer ‘s representative.
authorized: appointed by a duly constituted administrative or regulatory authority.
designated load: the specified size, shape, and weight ofmaterial to be lifted.designated person: a person selected or assigned by theemployer or the employer’s representative as being competent to perform specific duties.
normal operating conditions: conditions during which thelifter is performing functions within the scope of theoriginal design.
qualified person: a person who, by possession of a recognized degree in an applicable field or certificate of professional standing, or who,by extensive knowledge.training, and experience, has successfully demonstratedthe ability to solve or resolve problems relating to thesubject matter and work.
rated load: the maximum load for which the equipmentis designated by the manufacturer.
shall: indicates that the rule is mandatory and must befollowed.
should: indicates that the rule is a recommendation, theadvisability of which depends on the facts in each situ-ation.
SECTION 20-0.3: DEFINITIONS FOR CHAPTER 20-1
chain/hand wheel: a device for manually operating a lifterfriction-type pressure gripping lifters: lifters that grip theoad without significant or harmful permanent deforma-tion of the load surface (see Fig. 1).
grip ratio: the ratio of the sum of the horizontal forceson one side of the load to the live weight of the loadFor example, if the total horizontal force on one side ofthe load is 100,000 lb and the live load is 50,000 lb, thegrip ratio is 2. For purposes of this calculation, theweight of the load does not include the weight of thelifter (see Fig. 2).
gripping force: the force the lifting device exerts on theload.
indentation-type pressure gripping lifters: lifters that carrythe load by applying force to indent the sides of theload (see Fig. 3).
ingot turnover grab: a manipulating lifter [Fig. 4, sketch(e)l.
latch: a device for holding a lifter in the open or closedposition.
latch, automatic: a sequencing latch mechanism operatedby lifter motion.
lifting beam (spreader beam): a load supporting lifter [seeFig. 5, sketch (a)].
lock bar sheet lifter: a supporting lifter [see Fig. 5,
sketch (i)].
manipulating lifter: a lifter that rotates the load about oneor more axes during the lifting process (see Fig. 4).