API Spec 2C-2004 pdf download.Specification for Offshore Pedestal Mounted Cranes.
3 Definitions, Abbreviations, and Units 3.1 DEFINITIONS 3.1.1 A-frame: See gantry , also known as mast (see Figure 1, item 18). 3.1.2 allowable rope load: The “nominal” breaking strength of the rope divided by a design factor. 3.1.3 auxiliary hoist: See whip line (see Figure 1, item 27). 3.1.4 axis of rotation: The vertical axis around which the crane upper-structure rotates. 3.1.5 base (mounting): See pedesta l (see Figure 1, item 24). 3.1.6 bearing raceway: The surface of the bearing rings which contact the rolling element (balls or rollers) of the swing-bearing assembly. 3.1.7 bearing ring: The rotating and stationary rings that house the rolling elements (balls or rollers) of the swing-bear- ing assembly. 3.1.8 boom: A member hinged to the revolving upper- structure and used for supporting the hoist tackle. 3.1.9 boom angle: The angle above or below horizontal of the longitudinal axis of the base boom section. 3.1.10 boom angle indicator: An accessory which measures the angle of the boom above horizontal. 3.1.11 boom chord: A main corner member of a lattice type boom (see Figure 1, item 1). 3.1.12 boom extension: Intermediate section of a tele- scoping boom (see Figure 1, item 2). 3.1.13 boom foot-pin: The boom pivot point on the upper-structure (see Figure 1, item 3).
3.1.31 C v : Vertical design coefficient that is multiplied by the Safe Working Load (SWL) to provide the vertical design load. 3.1.32 designated: Selected or assigned by the employer or the employer’s representative as being qualified to perform specific duties. 3.1.33 design load: The vertical design load is equal to the SWL times the vertical design coefficient C v . Other loads considered in design of the crane include offload, sideload, environmental loads, loads due to crane base motion, and other loads as defined herein. 3.1.34 design requirements: The requirements set forth by the manufacturer’s engineering authority for materi- als, manufacturing, fabrication, and inspection procedures to be employed in the production of the crane. 3.1.35 dynamic loading: Loads introduced into the machine or its components due to accelerating or decelerat- ing loads. 3.1.36 enclosure: A structure that may provide environ- mental protection for the machine. 3.1.37 fitness-for-purpose: The manufacture or fabri- cation of an assembly or component to the quality level required (but not necessarily the highest level attainable) to assure material properties, environmental interactions, and any imperfections present in the assembly or connection are compatible with the intended purpose. Fitness-for-purpose connotes an assembly or component may contain material or fabrication imperfections of sizeable dimensions but their presence has no influence on its performance or reliability. 3.1.38 fixed platform: A bottom supported, stationary structure without significant movement in response to waves and currents in operating conditions. Examples are fixed plat- forms with jacket and pile supports, jack-up rigs, and sub- mersible bottom-supported rigs. 3.1.39 floating harness (also known as bridle): A frame equipped with sheaves and connected to the boom by stationary ropes usually called pendants (see Figure 1, item 17).
3.1.43 gantry (also known as A-frame or mast): A structural frame, extending above the upper-structure to which the boom support ropes are reeved (see Figure 1, item 18). 3.1.44 guy rope: A non-operating, standing wire rope that maintains a constant distance between the points of attachment to the components connected by the wire rope. 3.1.45 hoisting: The process of lifting. 3.1.46 hoist mechanism: A hoist drum and rope reev- ing system used for lifting and lowering loads. 3.1.47 hoist rope: Wire rope involved in the process of lifting. 3.1.48 hoist tackle: Assembly of ropes and sheaves arranged for pulling. 3.1.49 hook block: Block with a hook attached used in lifting service. It may have a single sheave for double or triple line or multiple sheaves for four or more parts of line (see Figure 1, item 19). 3.1.50 hook rollers: Rollers that prevent the lifting of the revolving upper-structure from the roller path. Hook rollers are a means to connect the upper-structure to the foundation or pedestal. 3.1.51 H sig : The sea significant wave height existing that is associated with the load chart, rating, or other condition herein. 3.1.52 in service: A crane is in service when the operator is in control of the crane. 3.1.53 jib (also known as tip extension): An exten- sion attached to the boom point to provide added boom length for lifting specified loads (see Figure 1, item 14). 3.1.54 king-pin: Vertical pin or shaft that acts as a rota- tion-centering device and connects the revolving upper-struc- ture and base mounting. 3.1.55 king post: A tubular member that acts as the cen- terline of rotation and as the connective member to the plat- form (see Figure 1, item 20).