دیکشنری تخصصی مهندسی نفت - نسخه آنلاین

n: an instrument used to indicate flow rate. It consists of a float in a tapered tube, or a tapered float that moves in a fixed orifice. Row passing around an annular space between the float and its container causes the float to rise until its weight counterbalances the pressure drop across it. rotary n: the machine used to impart rota- tional power to the drill stem while permitting vertical movement of the pipe for rotary drilling. Modern rotary machines have a special component, the rotary or master bushing, to turn the kelly bushing, which permits vertical movement of the kelly while the stem is turning.