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A shaft that permits water to drain through an impermeable stratum to a permeable stratum.
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Related Terms |
SEA VALVE
A through hull valve, a shut off on a plumbing or drain pipe between the vessel's interior and the sea. |
INVERT LEVEL
The level of the lowest portion at any given section of a liquid-carrying conduit, such as a drain or a sewer, and which determines the hydraulic gradient available for moving the contained liquid.
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FORCE PUMP
A device used to inject a solution into a closed system through an opening such as a drain valve.
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GLAND DRAIN
The function of a gland drain is to draw of water from sealing gland cavities created by the condensation of sealing steam.
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BILGE
A recess area fitted at the curved section between the bottom and the side into which water drains from holds or other spaces.
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SCUPPER
Drains from decks to carry off accumulations of rainwater, condensation or seawater
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FREEING PORT
An opening in the lower portion of a bulwark, which allows deck water to drain overboard
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LIMBER HOLE
A small drain hole or slot in a frame or plate for the purpose of preventing water or oil from collecting
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BLOWDOWN VALVE
A valve generally used to continuously regulate concentration of solids in the boiler, not the drain valve.
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BLOWDOWN
The drain connection including the pipe and the valve at the lowest practical part of a boiler, or at the normal water level in the case of a surface blowdown. The amount of water blown down.
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