| 摘要 |
<p>IMPROVED PIPE SECTION AND COUPLING This invention relates to an oilfield line pipe section. The section is comprised of a length of tubing having mating male and female threads formed on the tubing adjacent the ends for releasably connecting two of the sections together. A compressible seal is carried adjacent the end of the tubing. A cooperating sealing surface is provided adjacent the ends of the tubing for axially compressing the seal to form an effective seal through at least 360 degrees of relative axial rotation when two sections are connected together. An indicia is provided on the tubing which is visible during assembly of two sections of tubing to indicate the range of allowable thread engagement providing effective sealing.</p> |
