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| Water hammer |
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Potentially damaging condition in steam pipes where waves develop on the condensate surface within a pipe as steam rushes over it. If the peak of the wave becomes high enough to reach the roof of the pipe, the water in the wave is pushed violently to the far end of the pipe.
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| Water-cooled vibrating grate |
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A boiler grate made up of a tuyere grate surface mounted on a grid of water tubes interconnected with the boiler circulation system for positive cooling. The structure is supported by flexing plates allowing the grid and grate to move in a vibrating action. Ashes are automatically discharged.
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| Waterlogged |
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Condition of steam coils where condensate is not discharged at a sufficient rate to keep it from accumulating in the coil. Filled with condensate, the coils do not transfer significant heat to the kiln.
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| Wobble plate |
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A rotating canted plate in an axial type piston pump which pushes the pistons into their bores as it "wobbles".
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| Wood |
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A solid lignocellulosic material naturally produced in trees and some shrubs, made of up to 40%-50% cellulose, 20%-30% hemicellulose, and 20% -30% lignin.
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| Work |
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The application of force over a definate distance. Work (W) = Force (F) x distance (s). Expressed in joules, ergs, and foot-pounds. The joule is exactly the amount of work done in exerting the basic metric unit of force, 1 newton, over the basic metric unit of distance, 1 metre.
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