ASME B20.1:2021 pdf download

ASME B20.1:2021 pdf download.Safety Standard for Conveyors and Related Equipment
1 SCOPE
ThisStandardappliestothedesign,construction,instal- lation, maintenance, inspection, and operation of conveyors and conveying systems in relation to hazards. The conveyors may be of the bulk material, package, or unit-handling types, where the installation is designed for permanent, temporary, or portable opera- tion. This Standard shall apply, with the exceptions noted below, to all conveyor installations. This Standard specifically excludes any conveyor designed, installed, or used primarily for the movement of people. This Standard does, however, apply to certain conveying devices that incorporate within their supporting structure workstations or operator’s stations specifically designed for authorized operating personnel. This Standard does not apply to conveyors for which specific standards are already in effect, or to equipment such as industrial trucks, tractors, trailers, automatic guided vehicles, tiering machines (except pallet load tierers), cranes, hoists, power shovels, power scoops, bucket drag lines, trenchers, platform elevators designed to carry passengers or an operator, manlifts, moving walks, movingstairways (escalators), highwayorrailroad vehicles, cableways, tramways, dumbwaiters, material lifts, industrial scissors lifts, pneumatic conveyors, robots, or integral machine transfer devices. Some of the foregoing have specific standards. The provisions of this Standard shall apply to equip- ment installed 1 yr after the date of issuance.
4 DEFINITIONS
accessible: applies to hazardous objects not guarded or isolated and likely to be contacted inadvertently. actuator: a device that initiates the action of controls or controllers andis manuallyoperated. Theactuatormaybe a push button, toggle switch, footpedal, hand lever, hand- settimer, or anyother device thatperforms the described function. antirunaway: a safety device that stops a declining, inclined, or vertical conveyor and thus prevents it from moving away in the event of a mechanical or elec- trical failure. apron pan: one of a series of overlapping or interlocking plates or shapes that, together with others, form the conveyor bed. automatically controlled: describes the operation by the actionofamechanismthatisinitiatedbysomeimpersonal influence, such as a conveyor thatis started bya low-level bin indicator. backstop: a mechanical device to prevent reversal of a loaded conveyor under action of gravity when forward travel is interrupted. bed: (a) that part of a conveyor upon which the load or carrying medium rests or slides while being conveyed (b) in bulk material conveyors, the mass of material being conveyed beltidler: a roller or series ofrollers thatsupports the belt of a belt conveyor. belttripper:adeviceincorporatingasystemofpulleysthat causes the conveyor belt to discharge material at one or more points along the length of the conveyor. boom: a cantilevered member or structure that may be hinged, fixed, or pivoted.brake:africtiondeviceforslowingdownconveyorcompo- nents, bringing conveyor equipment to a controlled stop, holding traveling or traversing equipment in a selected location, preventing reverse travel, and/or controlling overspeed due to the action of gravity. bunker: a large bin or compartment for storage of bulk materials.car unloader: a type of conveyor characterized by a shallow, horizontal loading section that enables it to receive and unload material from hopper bottom cars without requiring a pit or other excavation. carrier: (a) a device attached to or hung from trolleys to support the load (b) the receptacle inwhich objects are placed fortrans- mittal through a conveying system (c) the moving part of a vertical or inclined recipro- cating conveyor that supports the load cart: see truck. chain: a series oflinks pivotally joined together to form a medium for conveying or transmitting motion or power. General classes ofchain commonto conveyors are detach- able, pintle, combination, roller, rivetless, coil, inverted tooth, and bar link chains. chute: a trough through which bulk materials or objects are directed and lowered by gravity. The trough may be open or enclosed, straight or curved.