Ability of a filter to remove particle matter from an air stream. Measured by comparing concentrate of material upstream and downstream of the filter. Typical particulate sizes range from .3 micron to 50 micron.

Capable of going to sea.

The one who steers the boat.

Covers for closing up hatchways.

A longitudinal stiffener for the side of a ship, made of angle bar, bulb angle channel or plates, etc. Depending upon their locations, stringers are known as bilge stringers, side stringers, hole stringers, etc.

An instrument designed to detect the ultrasonic emissions and convert them to audible signal.

The after section of the propeller shaft.

A fluid (as hydrogen or air) that tends to expand indefinitely. Is one of three basic phases of matter.

A compressor designed to compress air or gas without contaminating the flow with lubricating oil. Piston rings and packing are usually made of TFE-based materials or carbon or other synthetic material that operate without lubrication.

Shore crane with a wide span.

The surface of the water.

Standard cubic feet per minute., SCFM or scfm. Flow of free air measured at some reference point and converted to a standard set of reference conditions (e.g., 14.4 psia, 80

A short length of line, usually braided or marled, used to temporarily bind the anchor cable to the messenger when the anchor is weighed by hand around the capstan.

Foaming water that rises upward immediately before stem of any craft being propelled through water.

A pressure-volume diagram for a compressor or engine cylinder produced by direct measurement made by the use of a device called an indicator.

The porous device which perform the actual process of filtration.

On a square-rigged ship, a tackle used for hoisting casks and provisions.

A party responsible for the payment as evidenced by the given instrument. Under letters of credit, the payer is the party on whom the draft is drawn, usually the drawee bank.

Also known as LTL or LCL.