Method and apparatus for counting turns when making threaded joi

Details Method and apparatus for counting turns when making threaded joi Method and apparatus for counting turns when making threaded joi

1978-09-12

1979-12-04

Gilden, Leon

Metal working

Means to assemble or disassemble

By rotation of work part

29407, 73139, 81 525, 173 12, B25B 2314

Patent

active

041764366

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), Weiner
patent: 3745820 (1973-07-01), Weiner
patent: 3975954 (1976-08-01), Barnich
patent: 4091451 (1978-05-01), Weiner 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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