Relacionar Columnas Drilling RigVersión en línea Parts of drilling rig por Tatiana Yaikina 1 derrick 2 draw works 3 travelling block 4 kelly 5 rotary drive 6 mud pit 7 crown block A steel frame on beams at the top of the derrick. A machine used to impart rotational power to the drill string. A steel frame with wheels which moves up or down in the derrick A hoisting mechanism which raises or lowers the drill pipe and drill bit. A steel pipe, located at the top of drill string. A large structure standing on four legs and reaching the crown block. Steel tank used as a mud collector.