ASME B30.3-2009 pdf download

ASME B30.3-2009 pdf download.Tower Cranes.
climbing frame: for free-standing, braced, or guyed cranes, a structural frame supporting the superstructure which surrounds the tower (mast) and contains arrange- ments to raise the frame and superstructure of the crane for insertion of an additional tower section; for internal climbing cranes, a frame used to transmit operational and climbing reactions to the host building frame. climbing ladder: a steel member with crossbars (used in pairs) suspended from a climbing frame and used as jacking support points when some cranes climb. clutch: a means for engagement or disengagement of power. counterjib (counterweight jib): a horizontal member of a crane on which the counterweights and usually the hoisting machinery are mounted. counterweight: weights added to a crane superstructure to create additional stability or to counter the effects of the lifted load; they rotate with the crane as it swings. crane: in this Volume, the use of the word crane refers to construction tower cranes, which are lifting machines consisting of a tower (mast) with a superstructure that rotates and includes a load boom (jib) and, on some cranes, a counterjib extending in the opposite direction to the load boom (jib). crane, standby: a crane that is not in regular service but that is used occasionally or intermittently as required. crossover points: points of rope contact where one layer of rope on a rope drum crosses over the previous layer. designated person: a person selected or assigned by the employerorthe employer’s representative as beingcom- petent to perform specific duties. drum: the cylindrical member around which rope is wound for lifting or lowering a load. dynamic loading: loads introduced into the machine or its components by forces in motion. equalizer: a device that compensates for unequal length or stretch of a rope. flange point: the point of contact between the rope and drum flange where the rope changes layers on a rope drum. free-standing height: that height of a crane which is sup- ported by the tower (mast) alone without assistance from braces, guys, or other means. gage, track: the horizontal distance between two rails measured perpendicular to the direction of travel.
high strength (traction) bolts: high strength tensile bolts used in the assembly of crane sections. The bolts are installed in tension, by torquing or other means, at a level greater than that produced by in-or out-of-service loads for the purpose of reducing the likelihood of bolt fatigue failure. in-service: the condition of a crane ready for or engaged in work; an operator is at the controls. jib (boom): see boom (jib). jib point: the outward end of the load bearing jib. limiting device: a mechanical device that is operated by some part of a power driven machine or equipment to control loads, or motions of the machine or equipment. load: the total superimposed weight on the load block or hook. load, working: the external load applied to the crane including the weight of load attaching equipment such as ropes, shackles, hooks, slings, and load blocks (unless the load block is considered a part of the rating by the manufacturer). load block, lower: the assembly of hook or shackle, swivel, sheaves, pins,andframe suspended bythehoistingrope. load block, upper: the assembly ofsheaves, pins, and frame attached to the boom or mounted in the load trolley. load hoist: a hoist drum and rope reeving system used for hoisting and lowering loads. mast: see tower. out-of-service: the condition of a crane when unloaded, without power and with the controls unattended, and prepared to endure winds above the in-service level. parking track: for rail mounted cranes, a section of track supported so that it is capable of sustaining storm induced bogie loads; it is provided with storm anchor- ages when required. pitch diameter: the diameter of a sheave or rope drum measured at the centerline of the rope. qualified person: a person who, by possession of a recog- nized degree in an applicable field or a certificate of professional standing, or by extensive knowledge, train- ing, and experience, has successfully demonstrated the ability to solve or resolve problems relating to the subject matter and work. radius (load): the horizontal distance from a projection of the axis of rotation to the base of the crane, before loading, to the center of the vertical hoist line or tackle with load applied.