ASME B30.17-2003 pdf free download.OVERHEAD AND GANTRYCRANES (TOP RUNNING BRIDGE, SINGLEGIRDER, UNDERHUNG HOIST)
(a) Class I locations: locations in which flammable gases or vapors are or may be present in the air in quantities sufficient to produce explosive or ignitable mixtures
(b) Class II locations: locations that are hazardous because of the presence of combustible dust
(c) Class III locations: locations that are hazardous because of the presence of easily ignitable fibers or flyings, but in which such fibers or flyings are not likely to be in suspension in the air in quantities sufficient to produce ignitable mixtures hoist: a machinery unit that is used for lifting or lowering a freely suspended (unguided) load. hoist,
auxiliary: a supplemental hoisting unit, usually of lower load rating and higher speed than the main hoist. hoist motion: motion that lifts or lowers a load.
lifting devices: devices that are not reeved onto the hoist rope or chain, such as hooks on buckets, magnets, grabs, and other supplemental devices used for ease of handling certain types of loads. The weight of these devices is to be considered part of the rated load.
load: the total superimposed weight on the load block or hook. load block: the assembly of hook or shackle, swivel, bearing, sheaves, pins, and frame suspended by the hoisting rope or load chain.
This shall include any appurtenances reeved in the hoisting rope or load chain. load, rated: the maximum load designated by the manu- facturer for which a crane or individual hoist is designed and built. master switch: see switch, master. noncoasting mechanical drive: a drive that automatically results in decelerating a trolley or bridge when power is not available. normal operating conditions (ofcab-operated cranes): condi- tions during which a crane is performing functions within the scope of the original design. Under these conditions, the operator is at the operating control devices and no other person is on the crane.
normal operatingconditions (offloor-operated cranes): conditions during which a crane is performing functions within the scope of the original design. Under these conditions, the operator is at the operating control devices that are attached to the crane, but it is operated with the operator off the crane and with no person on the crane.
normal operatingconditions (ofremote-operated cranes): con- ditions during which a crane is performing functions within the scope of the original design. Under these conditions, the operator is at the operating control devices that are not attached to any part of the crane and no person is on the crane. overload: any load greater than the rated load.
pendant station: controls suspended from the crane for operating the unit from the floor. qualified person: a person who, by possession of a recognized degree in an applicable field or certificate of professional standing or by extensive knowledge, training, and experience, has successfully demonstrated the ability to solve or resolve problems relating to the subject matter and work.
rail sweep: a device attached to the crane and located in front of the crane’s leading wheels to push aside loose obstructions. rope: refers to wire rope unless otherwise specified. runway: an assembly of rails, beams, girders, brackets, and framework on which the crane travels. serviceplatform: a meansprovidedforworkers to perform maintenance, inspections, adjustments, and repairs of cranes.
shall: use of this word indicates that a rule is mandatory and must be followed. should: use of this word indicates that a rule is a recom- mendation, the advisability of which depends on the facts in each situation.
side pull: the component of the hoist pull acting horizontally when the hoist lines are not operated vertically.
sills: horizontal structural members that connect the lower ends of two or more legs of a gantry crane on one runway. span: the horizontal distance, center to center, between runway rails. stop: a device to limit travel of a trolley or crane b
ridge. This device normally is attached to a fixed structure and normally does not have energy absorbing ability.
switch (valve): a device for making, breaking, or changing the connections in an electric, hydraulic, or pneumatic circuit. switch, emergency stop: a manually actuated switch to disconnect power independently of the regular operating controls.
switch, limit: a device that is actuated by the motion of a part of a power-driven machine or equipment to alter ordisconnectthe electric, hydraulic,or pneumaticcircuit associated with the machine or equipment.ASME B30.17 pdf download.ASME B30.17-2003 pdf free download
