| 摘要 |
<p>A telescoping joint (J) suitable for use in repair of subsea pipelines includes an inner tubular member (M1), and an outer tubular member (M2) for receiving the inner tubular member (M1) therein. Pressure responsive means (E) can extend the joint (J) by causing relative extending movement between the members, and pressure responsive means (R) can retract the joint (J) by causing relative retracting movement between the members. Pressure responsive locking means (L) can cam grip elements into tight locking engagement between the members, and a pressure responsive sealing means (S) can be operated to provide metal-to-metal seal between the members upstream of the extending means (E), retracting means (R) and locking means (L). Additionally, testing means is provided to establish the fluid tightness of the sealing means (S) in the subsea location prior to the installation of the joint (J) into the pipeline as a replacement for a damaged section which has been removed. Both locking means (L) and sealing means (S) are releasable by reversing the application of fluid pressure to the means.</p> |
