Multi-taper and multi-pitch diameter API eight round thread coupling
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United States of America Patent
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Issued Date -
Dec 16, 2004
app pub date -
Jun 10, 2003
filing date -
Jun 10, 2003
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
The taper and pitch diameter of a conventional API eight round thread coupling are varied over the axial length of the threads. The variations are held within the allowable tolerances of the applicable API specifications. The variations minimize the interference and galling occurring in the first and last engaged threads between the coupling and a pipe end having an externally formed API thread that is screwed into the coupling beyond the maximum API penetration.
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