Z94.8 Facility Planning & Design

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DEAD LOADS. The loads on a structure that remain in a fixed position relative to the structure.

DECENTRALIZED STORAGE. Storage that is distributed throughout a facility and is not centralized in one location.

DECK. The horizontal load-carrying or load-bearing surface of a pallet. Top deck—Load-carrying surface. Bottom deck—Load-bearing surface.

DECK (PALLET STORAGE RACK). A solid top or platform supported by beams.

DECK (PORTABLE METAL STACKING RACK). The platform attached to the base.

DECKMEMBER. A surface element used in the construction of a pallet deck.

DECKMEMBER CHAMFER. A beveled edge on the side of the bottom deckmember for the purpose of easing the entry and exit of pallet truck load wheels.

DECK OPENING. Any void in the deck caused by spacing of surface elements.

DECK SPACER. A structural member which supports the top deck and/or separates the top and bottom decks.

DECLARED VALUE (AIR TRANSPORT). The value of the shipment declared by the shipper. In air freight, declared value on most shipments has historically been 50 cents a pound or 50 dollars, whichever is greater, assumed unless the shipper declares a higher value.

DECODER LOGIC. The electronic package which receives the signals from a scanner, performs the algorithm to interpret the signals into meaningful data and provides the interface to other devices.

DEDICATED STORAGE POLICY. A storage policy in which each item is assigned to a specific set of storage spaces.

DEEP LANE STORAGE. Storage depth which is greater than two loads deep on one or both sides of an aisle.

DEFERRED RATE (AIR TRANSPORT). Rate for deferred service in return for the greater flexibility given the airlines in determining when to move such freight. The rates are usually lower than general commodity rates.

DEFERRED SERVICE (AIR TRANSPORT). A service under which delivery is deferred for a specified number of days (to the third or fourth day, for example).

DEHUMIDIFY. To dry out or absorb moisture by means of machinery, baking, ventilating, or by the use of desiccant.

DELIVERY TABLE. (1) A conveyor which transports material from the discharge of a machine; (2) A table to which a chute discharges.

DEMOUNTABLE BOX. A steel case with a cover in which a battery is assembled for use on a truck that does not have its own integral battery compartment.

DEMOUNTABLE CARGO CONTAINER. A reusable weatherproof cargo container for shipping or storing materials as a unit that can be secured to carrier equipment.   demountable cargo container — standard group i.   A demountable cargo container of rigid construction, rectangular configuration, with end doors, in nominal lengths of 10, 20, 30 and 40 feet and width and height of 8 feet. Containers can be stacked and are normally positioned longitudinally on carrier equipment.  demountable cargo container—standard group ii.    A demountable cargo container of rigid construction, rectangular configuration, with end doors, in nominal lengths of 6 2/3 feet and 5 feet, with a width of 8 feet and optional heights of 8 feet or 6 feet 10 inches, capable of being stacked, supported and mounted on 6-inch side runners for either platform or forklift handling. Containers are normally positioned transversely on carrier equipment.

DEMURRAGE. A penalty charge assessed by carriers for detention of cars, ships or trucks by shippers or receivers of goods beyond a specified free time.

DEPTH OF FIELD. The distance between the maximum and minimum plane in which a symbol can be read.

DERRICK CRANE. A fixed crane consisting of a mast or equivalent member held at the head by guys or braces, with or without a boom, for use with a hoisting mechanism.

DESICCANT. A substance which by virtue of its physical structure and/or chemical nature, absorbs water; it is typically used within a sealed package or enclosed space.

DESTINATION INSPECTION. The inspection performed at the receiving point of the consignee of material to ascertain whether the shipment is in conformance with purchase specifications; frequently called receiving or incoming inspection.

DETERIORATION. Any impairment of quality, value, or usefulness, including damage caused by erosion, corrosion, combustion, and contamination.

DIESEL-ELECTRIC TRUCK. An electric truck in which the power source is a diesel engine-driven generator.

DIMENSIONAL WEIGHT. The density, or weight per cubic foot of a shipment.

DIMENSIONAL WEIGHT RULE. A practice applicable to low density shipments under which the transportation charges are based on a dimensional weight rather than upon actual weight.

DISCHARGED AND WET. Is the condition of a storage battery when it is filled with electrolyte and is discharged. An initial charge is required before it is ready for use.

DISCONNECT DEVICE, MAIN LINE. A device used to open the electric circuit.

DISCRETE CODE. A bar code or symbol where the space between characters (“Inter-character gap”) is not part of the code.

DISCRETE MANUFACTURING SYSTEM. A system in which the manufacturing process is not continuous

DISPATCH RULES. Rules programmed into the controller of a discrete material handling device or used manually to control when, where and how the device is to be released into the material flow network.

DISTRIBUTION POINTS. Depots, warehouses, or other warehousing activities having the mission for the receipt, storage, and issue of goods, normally for a given geographical area.

DISTRIBUTION SERVICE. A service under which a distributor accepts and transports one shipment from one shipper and separates the shipment into a number of parts at the destination and distributes them to many receivers.

DIVERTER. An automated fixture on a slat conveyor capable of moving in a direction along the length of the slat. It is used to direct items from one conveyor line to another.

DOCK. A horizontal platform designed to place the floor of a building level with the bed of a vehicle.

DOCKBOARD. A portable or fixed device for spanning the gap or compensating for difference in level between loading platforms and carriers.

DOCK LEVELER. An adjustable rectangular platform of approximately highway truck width built into the dock edge used to compensate for the difference between varying truck bed heights and delivery platforms of a facility.

DOCK SHELTER. A stationary or retractable, rigid or flexible shield that allows goods from a truck to be transported into the building with little or no exposure to outside elements.

DOLLY. A wheeled manual transporting device with an open horizontal platform for low volume transportation.

DOUBLE ARM. Horizontal load member affixed to the column for loading on either side of the column.

DOUBLE DEEP STORAGE. Loads that are stored two deep on each side of an aisle.

DOUBLE LEG BUCKET ELEVATOR. A bucket elevator having the carrying and return runs enclosed in separate casings between the head and boot. (See BUCKET ELEVATOR.)

DOUBLE LEG EN MASSE CONVEYOR. An en masse conveyor or elevator in which the carrying and return runs are operated in separated parallel and adjacent casings.

DRAG CHAIN CONVEYOR. A conveyor having one or more endless chains which drag bulk materials through a trough. (See SLIDING CHAIN CONVEYOR.)


DRAWBAR PULL, MAXIMUM. The maximum towing force in pounds at a specified coupler height that a vehicle will develop on a level surface based upon a prescribed coefficient of friction existing between the driving wheel(s) and the supporting surface when the load is being moved at a uniform rate of not less than 1 percent of the top level travel speed.

DRAWBAR PULL, RATED NORMAL. The greatest sustained towing force in pounds at a specified coupler height that a vehicle will develop on a level surface and within a given duty cycle without exceeding the allowable continuous temperature rating for the components.

DRIVE GIRDER. The girder on which the bridge drive machinery is mounted.

DRIVE-IN RACK. A rack consisting of upright frames, rails, and ties permitting a vehicle to enter the structure from one side only to pickup up or deposit pallets on continuous rails. The structure dictates first-in, last-out storage.

DRIVE-THRU RACK. A rack consisting of upright frames, rails, and ties permitting a vehicle to enter the structure from opposite sides to pick up or deposit pallets on continuous rails. The structure permits first-in, first-out storage.

DRIVING HEAD. A motor-driven carrier head, the load-bearing wheels of which are driven.

DROP SECTION. A section of track that can be lowered out of alignment with a stationary track.

DRUM GROOVES. Helical grooves cut in the periphery of the drum to guide the hoisting rope.

DRUM HANDLER. A clamp to engage a drum(s). Drum handlers are available which engage the drum(s) in various ways and positions. Certain models may also manipulate drum(s).

DRUM SUPPORT. A unit composed of a pair of front to back members placed between a pair of beams used to support cylindrical objects.

DUAL COMMAND CYCLE. The time between actuation of the S/R machine and completion of a cycle in which one load is stored and another load is retrieved and the S/R machine is ready to start a new cycle.

DUMMY (BATTERY). Generally of wood, is employed in lead batteries to fill the space left in a tray when the specified number of cells is less than the tray's capacity.

DUMPER. An attachment for dumping containers. Various types are available to suit container and operational requirements.

DUNNAGE. Any material such as boards, planks, blocks, plastics, or metal bracing that is used in transportation and storage to support and secure supplies, to protect them from damage, or for convenience in handling.

DYNAMIC LOWERING. A method of control by which the hoist motor is so connected in the lowering direction, that when it is overhauled by the load, it acts as a generator and forces current either through the resistors or back into the line, thus acting as a brake or speed limit.


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