A shaft that permits water to drain through an impermeable stratum to a permeable stratum.


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.

FORCE PUMP

A device used to inject a solution into a closed system through an opening such as a drain valve.

GLAND DRAIN

The function of a gland drain is to draw of water from sealing gland cavities created by the condensation of sealing steam.

BILGE

A recess area fitted at the curved section between the bottom and the side into which water drains from holds or other spaces.

SCUPPER

Drains from decks to carry off accumulations of rainwater, condensation or seawater

FREEING PORT

An opening in the lower portion of a bulwark, which allows deck water to drain overboard

LIMBER HOLE

A small drain hole or slot in a frame or plate for the purpose of preventing water or oil from collecting

BLOWDOWN VALVE

A valve generally used to continuously regulate concentration of solids in the boiler, not the drain valve.

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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