Fremgangsmåte og anordning for å sikre rörledning under legging

摘要

A method and device for preventing water from penetrating into the rising part/intermediate section ( 12 ) of a pipe ( 6 ) when laying the pipe ( 6 ) on or near the seabed ( 8 ) by means of a pipelay vessel ( 1 ), and where a plug ( 22 ) that seals against, travels and locks in the inside passage of the pipe ( 6 ) is arranged inside the pipe ( 6 ) between the lay vessel ( 1 ) and the seabed ( 8 ), where during normal pipelaying the plug ( 22 ) is displaced in the pipe ( 6 ) so as to essentially maintain its relative position relative to the pipelay vessel ( 1 ), and where in the event of water flowing into the pipe ( 6 ), the plug ( 22 ) is locked in the pipe ( 6 ), whereby water is prevented from filling the rising part/intermediate section ( 12 ) of the pipe ( 6 ).