A special device that, when fitted into the rotary table, transmits torque to the kelly and simultaneously permits vertical movement of the kelly to make the hole is called a _________________.
A
master bushing
B
kelly slips
C
kelly bushing
D
rotary bushing
E
İlgili Sorular
On board small passenger vessels, how often shall the Master test the steering gear?The system of valves and cargo lines in the bottom piping network of a tank vessel that connects one...Oil may NOT be transferred unless __________.You are tending the lifeline of a man who entered a tank using a breathing apparatus. How many tugs ...When cold air displaces warm air you have a(n) __________.