Lars Josefsson. Important marine steam boiler information

Boiler glossary Q


QUADRUPLE-EXPANSION ENGINE -- A steam engine in which the steam is expanded successively in four cylinders of increasing size, all working on the same crankshaft. Occasionally with two low-pressure cylinders. Consequently five cylinders but expansion in four steps.
QUALITY CONTROL -- A form of inspection involving sampling of parts in a mathematical manner to determine whether or not the entire production run is acceptable, a specified number of defective parts being permissible.
QUICK-BREAK SWITCH -- A switch having a spring or other device to produce a quick break, independently of the operator.
QUICK-REVOLUTION ENGINES -- A term formerly applied to high-speed steam-engines direct-coupled to generators.

 

© 2007 Lars Josefsson   Boilers