| 摘要 |
A pipeline is laid from a first position to a second position with a connector at [[said]] the second position for connection to a subsea structure, at a depth L. A [[a]] first seabed transponder is installed on the centerline at the second position; a second seabed transponder is installed on the centerline upstream from the first transponder at a distance D3 greater than L; the first and second seabed transponders are located to determine the [[exact]] distance separating [[said]] the first and second seabed transponders; a first pipe transponder is attached on the pipeline and the pipeline is laid at the first position so that it will land close to the second seabed transponder; the second seabed transponder and the first pipe transponder are located to establish the [[exact]] distance between them; the distance is compared with the distance separating the first and second seabed transponders to calculate the remaining length of pipeline required to reach the second position.
|
