| 摘要 |
<p>A threaded pipe connection is disclosed for connecting two joints of pipe having externally threaded pin members (10, 12), one pin member (10) having external right-hand threads (14) and the other pin member (12) having left-hand threads (16). An internally threaded coupling (18) having right and left-hand threads (20, 22) that mates with the threads (14, 16) on the pin members (10, 12). An internal pressure seal ring (23) is positioned to provide a seal between the ends of the pin members (10, 12). A plurality of mating lugs (24) and grooves (26) on the ends of the pin members (10, 12) hold the pins from relative rotation when the connection is being made up. A metal-to-metal seal located between each pin member (10, 12) and the coupling (18) adjacent each end of the coupling (18) isolates the threads of the connection from the ambient environment thus sealing off the pipe annulus from external pressure due to hydrostatic head. Indicia such as engaging surfaces (24a, 26a) or aligned scribe lines on the pin members (10, 12) ensure that the sealing surfaces (28, 29, 30, 31) on the coupling (18) and the pin members (10, 12) that form the external seals are positioned to properly engage and form seals when the connection is made up.</p> |
