ASME B30.8:2015 pdf download

ASME B30.8:2015 pdf download.Floating Cranes and Floating Derricks
Within the general scope defined in Section I of the Introduction, ASME B30.8 applies to cranes and derricks mounted on barges or pontoons. Floating cranes are convertible for excavation service and other uses that are categorically not considered to be lifting service. The requirements of this Volume are applicable only to floating cranes and floating derricks used for vertical lifting and lowering offreely suspended unguided loads (see Figs. 8-0.1-1 through 8-0.1-5).
accessory: a secondary part or assembly of parts that contributes to the overall function and usefulness of a machine. administrative or regulatory authority: governmental agency or the employer in the absence of governmental jurisdiction. anchorage: a point of attachment for tie-downs. angle indicator, boom: an accessory that measures the angle of the boom to the horizontal. auxiliary hoist: a secondary hoist rope system used either in conjunction with, or independently of, the main hoist system. axis ofrotation: the vertical axis around which the crane superstructure rotates. billboard: a flat, usually inclined platform on which to stow spare or emergency anchors. bitt (bollard): an upright wooden or metal post on a dock, barge, or pontoon to which hawsers may be secured. boom: a member hinged to the superstructure and used for supporting the hoisting tackle. boom angle: the angle above or below horizontal of the longitudinal axis of the base boom section. boom harness: the block and sheave arrangement on the boom point to which the topping lift rope is reeved for raising and lowering the boom.boom hoist mechanism: a means for supporting the boom and controlling the boom angle. boom point: the outward end of the top section of the boom. boom stop (crane): a device used to limit the angle of the boom at the highest position. brake: a device used for retarding or stopping motion. cab: the operator’s compartment on a crane or derrick. capstan: a spool-shaped revolving drum, manually or power operated, used for heaving in of heavy mooring lines. A capstan head may be a component of an anchor windlass. chock: a mooring fitting having faired inner surfaces or rollers for guiding lines. cleat: a mooring fitting having two horizontal arms to which mooring lines are secured. clutch: a means for engagement or disengagement of power. counterweight: weight used to supplement the weight of the machine in providing stability for lifting working loads. cross angle: the lateral angle between the load tackle and center plane of boom caused by list and trim. derrick, shearleg: a boom with or without a mast, not capable of swinging, hinged at the bottom, and raised and lowered by a boom hoist mechanism or a hydraulic cylinder. derrick, stiffleg: a rigid member supporting the mast at the head. drum: a cylindrical member around which a rope is wound for lifting and lowering the load or boom. dynamic loading: loads introduced into the machine or its components by forces in motion. eye: a loop formed at the end of a rope by securing the dead end to the live end at the base of the loop.fiddle block: a type of tandem block consisting of two sheaves in the same plane held in place by the same cheek plates. floating crane: a rotating superstructure, power plant, operating machinery, and boom mounted on a barge or pontoon. The power plant may be installed below decks. The crane’s function is to handle loads at various radii. floating derrick: a mast or equivalent member held at the head by guys or braces, with or without a boom, for use with a hoisting mechanism and operating ropes, mounted on a barge or pontoon. The power plant may be installed below decks. foot bearingorblock(sill block): the lowersupportonwhich the derrick mast rotates. gantry (A-frame): a structural frame, extending above the superstructure, to which the boom support ropes are reeved.