ASME B30.17:2003 pdf download

ASME B30.17:2003 pdf download.OVERHEAD AND GANTRYCRANES (TOP RUNNING BRIDGE, SINGLEGIRDER, UNDERHUNG HOIST)
Volume B30.17 includes provisions that apply to the construction, installation, operation, inspection, and maintenance of hand-operated and power-driven over- head and gantry cranes that have a top-running single- girder bridge, with one or more underhung hoists (see B30.16 Volume) operating on the lower flange of the bridge girder, used for vertical lifting and lowering of freely suspended, unguided loads (see Figs. 1 through 5). The requirements included in this volume also apply to cranes having the same fundamental characteristics such as polar gantry cranes, cantilever gantry cranes, semi-gantry cranes, and wall cranes. Requirements for a crane used for a special purpose such as, but not limited to, non-vertical lifting service, lifting a guided load, or lifting personnel are not included in this volume.
abnormal operating conditions: environmental conditions that are unfavorable, harmful, or detrimental to or for the operation of a crane, such as excessively high or low ambient temperatures, exposure to adverse weather, corrosive fumes, dust-laden or moisture-laden atmo- spheres, and hazardous locations. administrative or regulatory authority: governmental agency, or the employer in the absence of governmental jurisdiction. appointed: assigned specific responsibilities by the employer or the employer’s representative. authorized: appointed by a duly constituted administra- tive or regulatory authority. brake: a device, other than a motor, used for retarding or stopping motion by friction or power means. braking, control: a method of controlling speed by remov- ing energy from the moving body or by imparting energy in the opposite direction.braking, countertorque (plugging): a method of controlling speed by reversing the motor line voltage polarity or phase sequence to develop torque in the direction oppo- site to the rotation of the motor. braking, dynamic: a method of controlling speed by using the motor as a generator, with the energy being dissi- pated in resistors. braking, eddy current: a method of controlling or reducing speed by means of an electrical induction load brake. braking, emergency: a method of decelerating a drive when power is not available. The braking effort may be established as a result of action by the operator, or automatically when power to the drive is interrupted. braking, hydraulic: a method of controlling or reducing speed by means of displacement of a liquid. braking means: a method or device used for stopping/ holding motion by friction or power. braking, mechanical: a method of controlling or reducing speed by friction. braking, pneumatic: a method of controlling or powering a drive or brake by means of compressed gas. braking, regenerative: a method of controlling speed in which the electrical energy generated by the motor is fed back into the power system. braking, service: a method to decelerate crane motion during normal operation. bridge: the part of an overhead crane, consisting of one girder, trucks, and (if applicable) drive mechanism, that carries the trolley or trolleys. bridge girder: a crane member on which carriers or trol- leys travel horizontally, mounted between and sup- ported by the end trucks. bridge travel: the crane movement in a direction parallel to the crane runway. bumper (buffer): a device for reducing impact when a moving crane or trolley reaches the end of its permitted travel, or when two moving cranes or trolleys come into contact. This device may be attached to the bridge, trolley, or runway stop. cab: the operator’s compartment on a crane. cab, skeleton: the operator’s compartment used for occa- sional cab operation of a normally floor- or remote- operated crane. chain, hand: the chain grasped by the operator to apply force required for lifting, lowering, or traveling motions. 1 chain, load: the load-bearing chain in a hoist. 1 clearance: the distance from any part of the crane to the nearest obstruction. collectors, current: contacting devices for conducting cur- rent from runway or bridge conductors.