Method for counting turns when making threaded joints

Details Method for counting turns when making threaded joints Method for counting turns when making threaded joints

1979-07-19

1982-12-28

Gilden, Leon

Metal working

Method of mechanical manufacture

With testing or indicating

29452, 7386223, 173 12, B23Q 500

Patent

active

043654029

ABSTRACT:
A method and apparatus are disclosed for making threaded joints, such as pipe joints, within a range of predetermined applied torque and turns values. A pipe or a pipe and a coupling are threaded onto the end of a pipe string. The applied torque is monitored and, when a reference torque value is exceeded, the number of turns are counted. When either the actual torque or the actual turns exceeds a predetermined minimum value for that parameter and the value of the other parameter exceeds a predetermined minimum value, but is less than a predetermined maximum value, a good joint is indicated and the make-up is stopped. A bad joint is predicted and make-up is stopped when the value of the actual torque divided by the actual turns falls outside a range of values defined by the slopes of a pair of boundary lines and predetermined minimum torque and minimum turn values. The actual turns value is a count which is initiated the first time the actual torque value equals the reference torque value, the count being incremented when the actual torque value is greater than the reference torque value and being decremented when the actual torque value is less than the reference torque value.

REFERENCES:
patent: 3368396 (1968-02-01), Burkles et al.
patent: 3606664 (1971-09-01), Weine
patent: 3745820 (1973-07-01), Weine
patent: 3975954 (1976-08-01), Barnich
patent: 4091451 (1978-05-01), Weine et al.
patent: 4104778 (1978-08-01), Vliet
patent: 4104780 (1978-08-01), Sigmund
patent: 4106176 (1978-08-01), Rice et al.
patent: 4142266 (1979-03-01), Dahl

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