ASME B30.18 pdf download.Stacker Cranes.
SECTION 18-0.1: SCOPE OF B30.18
Volume B30.18 includes provisions that apply to the construction, installation, operation, inspection, and
maintenance of hand-powered and power-driven overhead and gantry cranes that have a top or under running multiple girder bridge with a vertically guided carriage, with or without a top or under running trolley. The requirements included in this Volume also apply to stacker cranes having the same fundamental characteristics, such as cantilever gantry and semi-gantry stacker cranes.
SECTiON 18-0.2: DEFiNITIONS
18-0.2.1 Types of EquIpment
cab-operated stacker crane: a crane controlled by an operator in a cab that is attached to the bridge mast, trolley. stacker mast, or load carriage (see Fig. 18-0.2.1-1).
cantilever gantry stacker crane: a gantry or semi-gantry crane in which the bridge girders extend transversely beyond the crane runway on one or both sides.
crane a machine for lifting and lowering a load and moving it horizontally, with the hoisting mechanism being an integral part of the machine.
floor-operated stacker crrnw: a crane that is controlled by an operator on the floor or an independent platform using a means suspended from the crane (see Fig. 18-0.2.1-2).
gantry stacker crane: a crane similar to an overhead crane except that the bridge for carrying the trolley(s) is rigidly supported on two or more legs running on fixed rails or other runway.
outdoor crane: an overhead or gantry crane that operates outdoors and for which provisions are not available for storage in an area that provides protection to the crane from weather conditions.
18-1.7.4 RaIl Sweeps
(a) Bridge trucks for gantry type stacker cranes shall be equipped with sweeps that extend to the rail top, or below the rail top and project in front of the stacker crane leading wheels.
(b) Overhead top running stacker bridge trucks should he equipped with sweeps that extend below the top of the rail and project in front of the stacker crane leading wheels.
NOTE If wheel stops .lre used, rail sweeps may become impractical and cannot be used,
(c) Top running stacker trolley trucks should be equipped with sweeps that extend below the top of the rail and project in front of the stacker trolley leading wheels.
NOTE: If wheel stops are used, rail sweeps ma’ become impractical and cannot be used.
18-1.7.5 Wheel and Truck Frames
Means should be provided to limit the drop of stacker trolley and bridge truck frames to 1 in. (25 mm) in case of wheel or axle breakage.
18-1.7.6 Guards for Moving Parts
(a) Exposed moving parts such as gears, set screws, projecting keys, chains, chain sprockets, and reciprocating components that constitute a hazard under normal operating conditions shall be guarded.
(h) Each guard shall be capable of supporting, without permanent deformation, the weight of a 200 lb (90 kg) person unless the guard is located where it is not probable that a person will step on it.
SECTION 18-1.8: BRAKES
18•1.8.1 Brakes for Stacker Crane Hoists
(a) Each independent hoisting unit of a stacker crane shall be equipped with at least one holding brake, applied directly to the motor shaft or some part of the gear train.
(b) Each independent hoisting unit of a stacker crane, except worm-geared hoists, the angle of whose worm is such as to prevent the load from accelerating in the lowering direction, shall, in addition to a holding brake, be equipped with control braking means to control lowering speeds.
18-1.8.2 Hoist Holding Brakes
(a) Holding brakes for stacker crane hoist units shall have not less than the following percentages of the rated load hoisting torque at the point where the brake is applied:
(1) 125% when used with a control braking means other than mechanical.
ASME B30.18 pdf download
