A stationary element between stages of a multistage centrifugal compressor. It may include guide vanes for directing the flowing medium to the impeller of the succeeding stage. in conjunction with an adjacent diaphragm, it forms the diffuser surrounding t ...

To bleed is the operation of draining any water out of a buoy which may have seeped inside after long use at sea.

A document, certified by a consular official, is required by some countries to describe a shipment. Used by Customs of the foreign country, to verify the value, quantity and nature of the cargo.

When U.S. Customs orders shipments without entries to be kept in their custody in a bonded warehouse.

A power or sailing boat used by pi-lots (men who have local knowledge of navigation hazards of ports).

Point at which all of the force of the wind can be thought to concentrate; the point in the sail plan that is the balance point for all the aerodynamic forces

The imaginary line running from bow to stern along the middle of the boat.

A common measurement of the internal volume of a ship with certain spaces excluded. One ton equals 100 cubic feet; the total of all the enclosed spaces within a ship expressed in tons each of which is equivalent to 100 cubic feet.

Small struts or spars extending toward the sides from one or more places along the mast. The shrouds cross the end of the spreaders, enabling the shrouds to better support the mast. Also known as crosstrees in older vessels.

The container of fresh water for drinking purpose used by the crew; formerly it consisted of a cask.

A soft, black, mayonnaise-like deposit which is typically an emulsion of oil, water, and oil insolubles.

The triangle formed by the masthead, the base of the mast at deck level, and the lower end of the headstay.

Railcars grouped in a train by destination so that segments (blocks) can be uncoupled and routed to different destinations as the train moves through various junctions. Eliminates the need to break up a train and sort individual railcars at each junction.

A symbol placed on packages for identification purposes; generally a triangle,square, circle, etc. with letters and/or numbers and port of discharge.

A term describing the seamen of a British warship.

Abbreviation for:- Port of Loading.- Petroleum, Oil, and Lubricants.

(1) The flag traditionally flown by pirate ships. (2) The name given by sailors to the bubonic plague, whose victims were said to turn black.

A long sturdy pole fitted with a blunt hook at one end designed to catch a line when coming alongside a pier or mooring, to facilitate putting a line over a piling, recovering an object dropped overboard, or in pushing or fending off.

A ball shaped buoy marking a navigational hazard.

A free port in a country divorced from Customs authority but under government control. Merchandise, except that which is prohibited, may be stored in the zone without being subject to import duty regulations.