Apparatus and method for connecting pipes during underwater pipe-laying
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F16L-001/12
출원번호
US-0473015
(2002-03-26)
우선권정보
GB-0007637 (2001-03-27)
국제출원번호
PCT//EP02/04195
(2004-01-13)
§371/§102 date
20040113
(20040113)
국제공개번호
WO02//07750
(2002-10-03)
발명자
/ 주소
Tosi, Luciano
Bonelli, Renato
출원인 / 주소
Saipem S.p.A.
대리인 / 주소
Burns, Doane, Swecker &
인용정보
피인용 횟수 :
8인용 특허 :
44
초록▼
A method of welding together the ends of outer pipe sections (16A, 16B) of pipe-in-pipe pipeline to be laid on a seabed employs an annular member (5) interposed between adjacent lengths of pipe. The annular member comprises a first axial part (11) which fits within the end of the first outer pipe se
A method of welding together the ends of outer pipe sections (16A, 16B) of pipe-in-pipe pipeline to be laid on a seabed employs an annular member (5) interposed between adjacent lengths of pipe. The annular member comprises a first axial part (11) which fits within the end of the first outer pipe section, and a flange part (12) which is interposed between the adjacent ends of the two lengths of outer pipe sections (16A, 16B) to be joined. The flange part (12) of the annular member (5) projects radially outwardly beyond the inside of the outer pipe sections (16A, 16B) and terminates radially inwardly of the outside of the outer pipe sections (16A, 16B), and provides some of the welding material for the joint.
대표청구항▼
1. A method of laying pipeline on a seabed, in which the pipeline comprises inner pipe lengths connected together and outer pipe lengths connected together around the inner pipe lengths and in which the outer pipe lengths are joined to the pipeline as it is laid by a welding process involving the fo
1. A method of laying pipeline on a seabed, in which the pipeline comprises inner pipe lengths connected together and outer pipe lengths connected together around the inner pipe lengths and in which the outer pipe lengths are joined to the pipeline as it is laid by a welding process involving the following steps for welding the end of a length of a first outer pipe to the end of a length of a second outer pipe:fitting an annular member in the end of the first outer pipe with a first axial part of the member within the first outer pipe and a second flange part of the member projecting radially outwardly beyond the inside of the first outer pipe and terminating radially inwardly of the outside of the first outer pipe; bringing the end of the second outer pipe into a position substantially axially aligned with and confronting the end of the first outer pipe, with the second flange part of the annular member interposed between the confronting ends of the first and second outer pipes, the second flange part projecting radially outwardly beyond the inside of the second outer pipe and terminating radially inwardly of the outside of the second outer pipe; welding the confronting ends of the first and second outer pipes together, the second flange part of the annular member providing some of the welding material; and in which the first axial part of the annular member includes a portion of reduced external diameter adjacent to the flange part, whereby, when the annular member is fitted in the end of the first outer pipe, an annular cavity is formed between the annular member and the inside of the end of the first outer pipe, the cavity being defined by the inside of the first outer pipe, the outside of the reduced external diameter portion of the first axial part and the flange part. 2. A method according to claim 1, in which the first outer pipe is at the end of the pipeline and the second outer pipe extends the pipeline once it has been welded to the first outer pipe.3. A method according to claim 1, in which the annular member includes a third axial part which is inserted within the end of the second outer pipe when the end of the second outer pipe is brought into the position confronting the end of the first outer pipe.4. A method according to claim 3, in which the third axial part reduces in external diameter with increasing axial spacing from the second flange part, whereby the end of the second outer pipe is guided into a position substantially axially aligned with the end of the first outer pipe as it is brought into the position confronting the end of the first outer pipe.5. A method according to claim 4, in which the third axial part of the annular member comprises a base portion of substantially constant diameter and a distal end portion of progressively reducing diameter.6. A method according to claim 1, in which the second flange part is continuous around the annular member and of substantially constant radial extent.7. A method according to claim 1, in which the second flange part is of substantially constant thickness.8. A method according to claim 1, in which the second flange part terminates at a location radially closer to the insides than to the outsides of the first and second pipes.9. A method according to claim 1, in which the ends of the lengths of the first and second outer pipes are at an angle steeper than 45 degrees to the horizontal when the ends are welded together.10. A pipeline laid on a seabed by a method according to claim 1.11. An annular member for fitting in the end of a first outer pipe of a pipe-in-pipe pipeline during the process of welding the first outer pipe to a second outer pipe in a method of laying a pipeline on a seabed, the annular member including a first axial part for fitting within an end of the first outer pipe, a second flange part projecting radially outwardly beyond the first axial part, the first axial part of the annular member including a portion of reduced external diameter adjacent to the flange part, whereby, when the annular member is fitted in the end of the first outer pipe, an annular cavity is formed between the annular member and the inside of the end of the first outer pipe, the cavity being defined by the inside of the first outer pipe, the outside of the reduced external diameter portion of the first axial part and the flange part, and the annular member further including a third axial part for insertion within an end of the second outer pipe when the end of the second outer pipe is brought into a position confronting the end of the first outer pipe, the second flange part also projecting radially outwardly beyond the second axial part.12. An annular member according to claim 11, in which the second flange part projects radially outwardly beyond the first and second axial parts by a distance in the range from 1 to 7 mm.13. An annular member according to claim 11, in which the second flange part has a thickness in the range of from 0.5 to 2 mm.14. An annular member according to claim 11, in which the thickness of the second flange part is less than one hundredth of the overall diameter of the member.
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