ASME B30.28-2015 pdf download

ASME B30.28-2015 pdf download.Balance Lifting Units.
SECTION 28-0.1: SCOPE OF ASME B30.28
Volume B30.28 includes provisions that apply to the marking, construction, installation, inspection, testing, maintenance, and operation of balance lifting units (balancers). Balancers are distinguished by their ability to float the load. This Volume applies to balancers with fixed arm support (Fig. 28-0.1-1) and balancers with overhead flexible lifting medium (Fig. 28-0.1-2). This Volume does not apply to balancers with autonomous operation or balancers used for lifting personnel, as these units require additional considerations, provisions, and features that are not included in this Volume.
SECTION 28-0.2: DEFINITIONS
abnormal operating conditions: environmental conditions that are unfavorable, harmful, or detrimental to or for the operation of balancers, such as excessively high or low ambient temperatures, exposure to adverse weather, corrosive fumes, dust-laden or moisture-laden atmospheres, and hazardous locations.
balancer: a balance lifting unit capable of moving loads within the rated capacity and with the capability to float the load.
balancer service, heavij: service that involves operation within the rated load limit, which exceeds normal service.
bala ncer service, normal: service that involves operation with loads at or less than 65% of rated load for not more than 50% of the time.
balancer service, severe: service that involves normal or heavy service with abnormal operating conditions.
balancer, standby: balancers that are not in regular service but are used occasionally or intermittently, as required.
clearance: the distance from any part of the balancer to the nearest obstruction.
end effect or: a feature, device, method, or components for connecting the load to a balancer. Also may be referred to as “receiver” or “below the hook lifting devices” (see
ASME B30.20).
exposed: applies to hazardous objects not guarded or isolated (capable of being contacted inadvertently).
float the load: the ability to move the load up or down, without inputs to the operational controls, by applying a force to the load of less than 5% of the load.
hazardous (classified) locations: locations where fire or explosion hazards may exist. Locations are classified depending on the properties of the flammable vapors, liquids, or gases, or combustible dusts or fibers that may be present and the likelihood that a flammable or combustible concentration or quantity is present. Refer to NFPA 70.
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.
Class II locations: locations that are hazardous because of the presence of combustible dust.
Class Ill 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.
lifting medium: the balancer component that supports and moves the load up and down and determines the type of balancer.
load: the total superimposed weight on the balancer including any end effector devices attached to the balancer.
load, rated: the maximum load designated by the manufacturer for which the balancer is designed and built.
manual valves: a valve for which a manual actuator is the only means of valve actuation.
normal operating conditions: conditions during which bal— ancers are performing functions within the scope of the original design.
overload: any load greater than the rated load.
qualified person: a person who, by possession of a recognized degree or certificate of professional standing, or who by xtnsiv know1d. training.
load, rated: the maximum load designated by the manufacturer for which the balancer is designed and built.
manual valves: a valve for which a manual actuator is the only means of valve actuation.
normal operating conditions: conditions during which bal— ancers are performing functions within the scope of the original design.
overload: any load greater than the rated load. qualified person: a person who, by possession of a recognized degree or certificate of professional standing.