دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

abbr: top dead center.

n: (TDC) the position of a piston when it is at the highest point possible in the cylinder of an engine;often marked on the flywheel. the drill stem and bit, the top-drive system retains it to provide a place to set the slips to suspend the drill stem when drilling stops.

n: an engine in which the piston moves from top dead center to bottom dead center and then back to top dead center to complete a cycle. Thus, the crankshaft must turn one revolution, or 360�.