ASME B30.2:2016 pdf download.Overhead and Gantry Cranes(Top Running Bridge, Single or Multiple Girder, Top Running Trolley Hoist).
Volume B30.2 includes provisions that apply to the construction, installation, operation, inspection, and maintenance of hand-operated and power-driven overhead and gantry cranes that have a top-running single- girder or multiple-girder bridge, with one or more top- running trolley hoists used for vertical lifting and lowering of freely suspended, unguided loads consisting of equipment and materials (see Figs. 2-0.2-1 through 2-0.2-5). The requirements included in this Volume also apply to cranes having the same fundamental characteristics such as 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.
SECTION 2-0.2: DEFINITIONS
abnormal operating conditions: environmental con d it ions 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 atmospheres, and hazardous locations.
accessory: a secondary part or assembly of parts that contributes to the overall function and usefulness of a crane.
auxiliary hoist: supplemental hoisting unit usually of lower load rating and higher speed than the main hoist. brake: a device, other than a motor, used for retarding or stopping motion by friction or power means.
brake, holding: a friction brake for a hoist that is automatically applied and prevents motion when power to the brake is off.
brake, mechanical load: an automatic type of friction brake used for controlling loads in a lowering direction. This unidirectional device requires torque from the motor to lower a load but does not impose any additional load on the motor when lifting a load.
braking means: a method or device used for stopping! holding motion by friction or power.
braking, control: a method of controlling speed by removing energy from the moving body or by imparting energy in the opposite direction.
braking, cou ntertorque (plugging): a method of controlling speed by reversing the motor line voltage polarity or phase sequence to develop torque in the direction opposite the rotation of the motor.
braking, dynamic: a method of controlling speed by using the motor as a generator, with the energy being dissipated 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, mechanical: a method of controlling or reducing speed by friction.
braking, pneumatic: a method of controlling or reducing speed 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.ASME B30.2 pdf download.