| 摘要 |
A threaded pipe connection for assembly with the use of thread dope, having a box (2) and pin (1) formed with tapered mating wedgethreads, the box threads having crests (21), roots (8), stab flanks (4) and load flanks (6), the pin threads having crests (7), roots (20), stab flanks (3) and load flanks (5), an included angle (35) measured in the gap between the flanks, the threads having a first axial crest width as at (17) and a second axial crest width as at (54), the first and second crest widths being positioned one thread turn apart, first crest width (17) being dimensioned with first radius (18) and second crest width (54) being dimensioned with second radius (55), a bridge thickness dimension that is the widest gap width the dope can seal between the mating threads, a least thickness dimension that the dope can be compacted to between the mating threads, comprising: the first crest radius minus the second crest radius being a first quantity; the first crest width minus the second crest width being a second quantity; the first quantity divided by the second quantity being a change ratio; the change ratio being not greater than the ratio of, the bridge thickness dimension divided by the least thickness dimension.
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