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| Hammermill |
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Equipment used to reduce particle size of feed ingredients. Achieved by impact with swinging hammers.
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| Hammermill rods |
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Rods inside the hammermill, which the hammers attach to.
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| Hammermill screens |
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Perforated screens inside a hammermill used to separate particle sizes. Particles successfully reduced by the hammer mill pass through the screen and leave the hammer mill with the aid of a pneumatic system.
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| Haulage |
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The horizontal transport of ore, coal, supplies and waste.
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| Head |
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The height of a column or body of fluid above a given point expressed in linear units. Head is often used to indicate gage pressure. Pressure is equal to the height times the density of the fluid.
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| Head section |
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The area of a conveyor used for discharging material. Most often this is the location of the conveyor drive (motor/gearbox).
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| Headframe |
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Structure supporting the shaft and hoist (hoisting) pulley. Often refers to the hoist itself.
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| Heat |
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The form of energy that has the capacity to create warmth or to increase the temperature of a substance. Any energy that is wasted or used to overcome friction is converted to heat. Heat is measured in calories or British thermal units (Btu's). One Btu is the amount of heat required to raise the temperature of one pound of water one degree Fahrenheit.
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| Heat exchanger |
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A device which transfers heat through a conducting wall from one fluid to another.
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| Hectare (ha) |
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A metric unit of area, 100 metres by 100 metres (10,000 square metres); equivalent to 2.471 acres.
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| Helical |
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Spiral-shaped: in the shape of a helix or spiral.
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| Hertz (Hz) |
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Unit of frequency; equal to one cycle per second (cps).
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| Hoist |
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A drum on which hoisting rope is wound.
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| Hoisting |
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The vertical transport of ore, coal, supplies and waste.
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| Horsepower (hp) |
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The power required to lift 550 pounds one foot in one second or 33,000 pounds one foot in one minute. A horsepower is equal to 746 watts or to 42.2 British thermal units per minute.
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| Host rock |
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A layer of rock which holds or surrounds the mineral bearing rock.
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| Hydraulic |
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To move or convey by fluid.
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| Hydraulic balance |
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A condition of equal opposed hydraulic forces acting on a part in a hydraulic component.
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| Hydraulic control |
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A control which is actuated by hydraulically induced forces.
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| Hydraulics |
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Engineering science pertaining to liquid pressure and flow.
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| Hydrodynamics |
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Engineering science pertaining to the energy of liquid flow and pressure.
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| Hydrostatics |
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Engineering science pertaining to the energy of liquids at rest.
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| Hygrometer |
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An instrument for measuring the humidity of air.
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| Hygroscopic |
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Changes its moisture content to be in equilibrium with the atmosphere.
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