A crusher with one fixed jaw plate and one pivoted at the top so as to give the greatest movement on the smallest lump.

Related Terms


A backward movement of a vessel


A device permitting air movement between atmosphere and the component in/ on which it is installed.


The plates forming the outer side and bottom skin of the hull


A single wide plate that is butt-connected to two narrow plates, usually near the ends of a ship.


Lowest temperature at which an oil or distillate fuel is observed to flow, when cooled under conditions prescribed by test method ASTM D 97. The pour point is 3°C (5°F) above the temperature at which the oil in a test vessel shows no movement when the container is held horizontally for five seconds.


Maintenance performed according to a fixed schedule involving the routine repair and replacement of machine parts and components.


A chemical compound whose molecules exhibit electrically positive characteristics at one extremity and negative characteristics at the other. Polar compounds are used as additives in many petroleum products. Polarity gives certain molecules a strong affinity for solid surfaces; as lubricant additives (oiliness agents), such molecules plate out to form a tenacious, friction- reducing film. Some polar molecules are oil-soluble at one end and water-soluble at the other end; in lubricants, they act as emulsifiers, helping to form stable oil-water emulsions. Such lubricants are said to have good metal-wetting properties. Polar compounds with a strong attraction for solid contaminants act as detergents in engine oils by keeping contaminants finely dispersed.


Corrugated cylindrical container which moves as pressures change, or provides a seal during movement of parts.


Plate or cap which encloses compression end of compressor cylinder or combustion chamber of engine.


An open curve with two parts, all points of which have a constant difference in distance from two fixed points called FOCI.

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