Apparatus for counting turns when making threaded joints including an increased resolution turns counter

摘要

Apparatus is provided for facilitating the control of the threading of one threaded member into another to make a threaded joint. Means are provided for generating an actual turns signal by dividing down a high frequency (e.g. 10,000 pulses per revolution) signal responding to the speed of rotation of the one member, the division ratio being variable to suit a particular pulse generator to the diameter of the particular threaded member. Means may be provided for utilising such a signal either for automatic control of the turning or for giving an indication that the rate of turn should be controlled. The apparatus is particular described in relation to pipe strings run into bore holes of oil or gas wells. IMAGE