ASME B30.7-2006 pdf download.Base-Mounted Drum Hoists.
SECTION 7-0.1: SCOPE OF B30.7 Within the general scope defined in Section I, B30.7 applies to base-mounted drum hoists arranged for mounting on a foundation or other supporting structure for lifting or lowering loads, to derrick swingers, and to any variations that retain the same fundamental char- acteristics. The scope includes hoists that are powered by internal combustion engines, electric motors, com- pressed air, or hydraulics, and which utilize drums and rope. This Volume does not apply to overhead hoists, car pullers, barge pullers, truck body hoists, or other hoists or winches used exclusively in horizontal pulling applications. Provisions of this Volume do not encompass all of the safety precautions and safeguards applicable when hoist loads consist wholly, or in part, ofpersonnel. For person- nel handling hoists refer to ANSI A10.4. When base- mounted drum hoists are used as an integral part of other lifting equipment, this Standard may not apply. SECTION 7-0.2: DEFINITIONS 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. base: the mounting flanges or feet for attachment of a hoist to its supporting structure or foundation. boom: a member hinged to a fixed or rotating structure or to a derrick mast, with its outer end supported by ropes leading to a gantry or A-frame, or derrick mast top or other anchorage, and used for supporting the hoisting tackle. brake: a device used for retarding or stopping motion by friction or power means. clutch: a means for engagement or disengagement of power.
derrick: an apparatus for lifting or lowering loads con- sisting of a mast or equivalent member held at the head by guys or braces, with or without a boom, for use with hoists and ropes. designated person: a person selected or assigned by the employerorthe employer’s representative asbeingcom- petent to perform specific duties. drum: the cylindrical member around which rope is wound for lifting or lowering the load or boom, or swinging the boom supporting structure. drum capacity, rope: the length of a specific diameter of rope that can be wound on a drum. dynamic loading: loads introduced into the machine or its components by forces in motion. exposed: applies to hazardous objects not guarded or isolated (capable of being contacted inadvertently). eye splice: an eye formed at the end of a rope by splicing the dead end into the live end at the base of the eye. flange point: a point of contact between rope and drum flange where the rope changes layers. gantry: (also known as A-frame) a structural frame, extending above a base structure, to which boom sup- port ropes are reeved. hoist: a power driven drum(s) capable of lifting and lowering loads. hoist, direct geared: a hoist with drum(s) geared directly to its power source. hoist, drum: a hoist with hoisting drum(s), and with or without a swinger (see Fig. 1). hoist, friction drum: a hoist with drum(s) controlled by friction clutches and brakes, and provided with drum ratchets and pawls. limiting device: a mechanical device that is operated by some part of a power driven machine or equipment to control motions of the machine or equipment.
ratchet: a toothed member, attached to or part of the drum, for engagement with the pawl. rated rope pull: (also known as rated line pull) the manu- facturer’s recommended load in pounds (kilograms) applied to the rope attached to the hoist drum. reeving: a rope system in which the rope travels around drums and sheaves. repetitive pickup point: when operating on a short cycle operation, the rope being used on a single layer and being spooled repetitively over a short portion of the drum. rope: refers to wire rope unless otherwise specified. rope, rotation resistant: a wire rope consisting of an inner layer of strands laid in one direction covered by a layer of strands laid in the opposite direction. This has the effect of counteracting torque by reducing the tendency of the finished rope to rotate. service, heavy: service that involves operation within the rated load limit, which exceeds normal service. service, normal: distributed service that involves opera- tion with randomly distributed loads within the rated load limit, or uniform loads less than 65% of rated load for not more than 25% of the time.