Steel tube threaded joint having an impervious device at the level of the threading
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United States of America Patent
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May 9, 1989
Issued Date -
N/A
app pub date -
Dec 5, 1986
filing date -
Oct 10, 1984
priority date (Note) -
Expired
status (Latency Note)
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Abstract
The invention concerns a steel tube threaded joint particularly useful in the petroleum industry of the type in which the male element (3) and female element (1) are combined by threading (2, 4) wherein a portion of the surface of each thread is forcefully applied to the status of screwing to the thread of the outer element. A first element (1) of the joint has a composite structure and has on at least a certain length of its thread a lining of synthetic material whose volume and shape correspond exactly to the volume and shape of the existing clearance of the screwing status between the metal part and composite element (1) and the second element (3) having dimensions at the limit of the machining tolerances which allow the greatest possible clearance in the assembled state of the joint.
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