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A porous pipe made of concrete and used principally for subsoil drainage; diameters over 15 inches (38 centimeters) are usually reinforced.



Related Terms

SEA CHEST

An opening for supplying seawater to condensers, pumps, etc. located in the hull below the waterline and having means for the attachment of the associated piping

SOUNDING PIPE

A pipe leading to the bottom of an oil or water tank, for guiding a sounding tape or jointed rod when measuring the depth of liquid in the tank.
Sounding pipes in the engine room are normally fitted with deadweight cocks and screw caps. Caps and cocks should be closed at all times, except when sounding tanks.

BACKING RING

A strip of thin plate used on the inner surfaces of the abutting ends of pipe, tubes, or plates which are butt-welded. Its purpose is to prevent irregularities at the base weld and to permit penetration at its root.

BETA RATIO

For a single orifice the beta ratio is the ratio of the orifice bore diameter to that of the upstream pipe diameter. However, since in burner designs typically there is more than one orifice at a riser pipe exit, the beta ratio is equal to the square root of the ratio between total area of the fuel ports to that of the upstream pipe area.

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.

DOWNCOMER

A tube or pipe in a boiler or waterwall circulating system through which fluid flows downward between headers.

HEADER PIPE

A distribution pipe supplying a number of smaller lines tapped off of it. A main receiving pipe supplying one or more main pipe lines and receiving a number of supply lines tapped into it.

LAGGING

A covering, usually of insulating material, on pipe or ducts.

MANIFOLD

A pipe or header for collecting a fluid from, or the distributing of a fluid to a number of pipes or tubes.

CHAIN PIPE

Pipe for passage of chain from windlass to chain locker

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