Measuring and testing – Brake testing – Single wheel rotating and resistance measuring means
Patent
1978-09-12
1980-07-01
Myracle, Jerry W.
Measuring and testing
Brake testing
Single wheel rotating and resistance measuring means
364506, F16B 3102
Patent
active
042100178
ABSTRACT:
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. The zero torque value of a torque transducer output signal is offset by an amount in excess of the maximum drift expected during the operation of the torque transducer. The value of the transducer output signal, before any torque is applied, is stored and subtracted from the actual torque signal value during the joint making operation to obtain an actual torque signal which is compensated for drift.
REFERENCES:
patent: 4073187 (1978-02-01), Avdeef
patent: 4091451 (1978-05-01), Weiner et al.
patent: 4104779 (1978-08-01), Sigmund
patent: 4106176 (1978-08-01), Rice et al.
Baker International Corporation
Myracle Jerry W.
Norvell, Jr. William C.
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