NO20076217L - Towing and underwater installation of long objects - Google Patents

Towing and underwater installation of long objects

Info

Publication number
NO20076217L
NO20076217L NO20076217A NO20076217A NO20076217L NO 20076217 L NO20076217 L NO 20076217L NO 20076217 A NO20076217 A NO 20076217A NO 20076217 A NO20076217 A NO 20076217A NO 20076217 L NO20076217 L NO 20076217L
Authority
NO
Norway
Prior art keywords
buoyancy
length
along
article
peaks
Prior art date
Application number
NO20076217A
Other languages
Norwegian (no)
Inventor
Vincent Marcel Ghislain Alliot
Original Assignee
Acergy France Sa
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from PCT/EP2006/005315 external-priority patent/WO2006117249A2/en
Application filed by Acergy France Sa filed Critical Acergy France Sa
Publication of NO20076217L publication Critical patent/NO20076217L/en

Links

Abstract

En langstrakt gjenstand (100) slik som en prefabrikert rørledning med flere kilometers lengde blir slept gjennom vann. Gjenstanden er tilveiebrakt langs sin lengde med oppdriftsjusterende materiale (102) avpasset tett opp til gjenstanden. Det oppdriftsjusterende materialet er tilstrekkelig til å gi gjenstanden totalt en positiv oppdrift slik at den ikke vil synke til sjøbunnen, og er fordelt ujevnt langs lengden av gjenstanden for å skape områder med negativ oppdrift. Dette får gjenstanden til å anta en bølgeprofil med topper (+) og bunner (-) langs sin lengde. Gjenstanden er i sine ytterender koblet til fremre og bakre slepere (104, 106) for styring av bevegelsen til gjenstanden gjennom vannet. Mellomliggende topper er valgfritt koblet til mellomliggende slepere (108) eller bøyer (702) via selvjusterende ballastkjettinger (1 10). Bølgeprofilen tillater den slepte konstruksjon å strekke seg uten for mye strekk på selve gjenstanden. Gjenstanden kan bli lagt til sjøbunnen progressivt ved fjerning av oppdriftselementene (102) ved bruk av en ROV (302).An elongated object (100) such as a prefabricated pipeline of several kilometers in length is dragged through water. The article is provided along its length with buoyancy-adjusting material (102) adapted closely to the article. The buoyancy-adjusting material is sufficient to give the object a total positive buoyancy so that it will not sink to the sea floor, and is distributed unevenly along the length of the object to create areas of negative buoyancy. This causes the object to assume a wave profile with peaks (+) and bottoms (-) along its length. The object is connected at its outer ends to the front and rear towers (104, 106) for controlling the movement of the object through the water. Intermediate peaks are optionally coupled to intermediate towers (108) or buoys (702) via self-adjusting ballast chains (1 10). The wave profile allows the towed structure to extend without too much tension on the object itself. The object can be added to the seabed progressively by removing the buoyancy elements (102) using an ROV (302).

NO20076217A 2005-05-05 2007-12-03 Towing and underwater installation of long objects NO20076217L (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0509179A GB0509179D0 (en) 2005-05-05 2005-05-05 Sea transportation and subsea installation of elongate articles
PCT/EP2006/005315 WO2006117249A2 (en) 2005-05-05 2006-04-28 Towing and subsea installation of long articles

Publications (1)

Publication Number Publication Date
NO20076217L true NO20076217L (en) 2007-12-03

Family

ID=34685127

Family Applications (1)

Application Number Title Priority Date Filing Date
NO20076217A NO20076217L (en) 2005-05-05 2007-12-03 Towing and underwater installation of long objects

Country Status (2)

Country Link
GB (1) GB0509179D0 (en)
NO (1) NO20076217L (en)

Also Published As

Publication number Publication date
GB0509179D0 (en) 2005-06-15

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Legal Events

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