WO2006045357A1 - Process, system and equipment for the towing of underwater pipelines - Google Patents
Process, system and equipment for the towing of underwater pipelines Download PDFInfo
- Publication number
- WO2006045357A1 WO2006045357A1 PCT/EP2005/007724 EP2005007724W WO2006045357A1 WO 2006045357 A1 WO2006045357 A1 WO 2006045357A1 EP 2005007724 W EP2005007724 W EP 2005007724W WO 2006045357 A1 WO2006045357 A1 WO 2006045357A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- pipeline
- float
- air
- pulling
- variable
- Prior art date
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/12—Laying or reclaiming pipes on or under water
- F16L1/16—Laying or reclaiming pipes on or under water on the bottom
- F16L1/163—Laying or reclaiming pipes on or under water on the bottom by varying the apparent weight of the pipe during the laying operation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/12—Laying or reclaiming pipes on or under water
- F16L1/16—Laying or reclaiming pipes on or under water on the bottom
- F16L1/165—Laying or reclaiming pipes on or under water on the bottom by towing the pipe on or near the bottom
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L1/00—Laying or reclaiming pipes; Repairing or joining pipes on or under water
- F16L1/12—Laying or reclaiming pipes on or under water
- F16L1/20—Accessories therefor, e.g. floats, weights
- F16L1/24—Floats; Weights
Definitions
- the present invention relates to a process, a system and equipment for the towing of underwater pipelines.
- con ⁇ trolled buoyancy floats can be used: for example, US 421529 describes an inflatable float capable of maintaining a con ⁇ stant buoyancy according to the depth, i.e. with the possi ⁇ bility of varying it as required again with reference to the depth.
- a combination of fixed and mobile buoyancy in- flatable floats can be used.
- the solution we propose to the problems of the known art is based on a geometric control of the configuration of the pipeline with respect to the seabed and not to the depth.
- the process for the towing of underwater pipelines, object of the present invention, by means of head tugs for the pulling and tail tugs for the counter-pulling, is char ⁇ acterized in that it is essentially effected with the use of a set of equipment, connected to the pipeline itself, substantially containing floats, of which at least a part has a variable buoyancy or partially variable buoyancy, which, when placed in a pre-established position and at pre-established intervals, provide a graded buoyancy to the pipeline in relation to the distance from the bed so as to obtain a "festoon" configuration of the pipeline, i.e. with suspended sections of pipeline, in correspondence with the floats, alternating with resting sections.
- the pulling operation is facilitated by a double ef- feet, static with the weight reduction of the pipeline (for the buoyancy of the float) and geometric (festooning, which leads to a sequential mobilization of the friction) .
- the longitudinal and transversal friction are of the same order of magnitude and consequently the pipeline is transversally stable.
- the process according to the inven ⁇ tion can comprise the following steps:
- a threshold height is pre-established, under which the buoyancy of the float is automatically increased and above which it is reduced.
- the threshold height is pre-established with structural calcu ⁇ lations to allow the buoyancy variation system, with refer ⁇ ence to the longitudinal pulling limit, to be set up. This threshold value does not have to be accurately calculated but it is sufficient to identify its order of magnitude and a reference datum.
- the desired festooning effect has the following advan ⁇ tages : it allows the pipe to be kept partially in contact with the seabed, improving its lateral stability and it re- symbolizes the pull necessary for the longitudinal movement thanks to a progressive mobilization effect of the friction as, before moving as a result of the pull in a longitudinal direction, the various spans of the piping will undergo an oscillation in a vertical direction allowing the maximal- sive detachment of the sections of pipe resting on the sea ⁇ bed, whose friction with the seabed will pass from the static friction conditions of the first detachment to the much more favourable conditions (lesser) of dynamic fric ⁇ tion without moving the whole length of the pipe as in the case of a non-festooned configuration.
- a further object of the invention relates to the sys ⁇ tem for towing underwater pipelines which substantially comprises :
- a set of equipment connected to the pipeline itself, substantially consisting of a variable or partially vari ⁇ able buoyancy float, whose lower base is at least par- tially open to act as an air "bell", having a nozzle for feeding the air, a suitable actuator consisting of a pipe or sections of pipe which provides a communication be ⁇ tween the inside and outside of said float, for the air discharge, with a fixed outlet mouth and an inlet mouth, positioned inside said float, said inlet mouth being ac ⁇ tivated by a mechanism which moves it according to the distance of said pipeline from the bottom;
- a further object of the invention relates to the equipment (A) which can be used in the process or in the system for the towing of underwater pipelines described above, which comprises:
- a float in the form of a prism with a horizontal or vertical axis, with a variable or partially variable buoy ⁇ ancy, whose lower base is at least partially open to act as an air "bell”, having:
- a suitable actuator consisting of a pipe or sec- tions of pipe forming a communication between the inside and outside of said float (G) , for the air discharge, having a fixed outlet mouth (B u ) and an inlet mouth (Bi), positioned inside said float, with a variable height swing from a pre-established mini- mum position to a pre-established maximum position; • means for connecting said equipment to the pipeline;
- Said floats which can be made of a metallic, plastic and/or composite material, are preferably filled with com ⁇ pressed air at environment pressure.
- the float is at least partially open in the lower part for acting as an air "bell", its shell and structure are only suitable for resisting a small overpressure with respect to the seabed.
- the float is naturally structurally conceived for transmitting the buoyancy to the pipeline to which it is connected by means of cables or belts or other connections.
- the structure of the float in itself and the means of connecting it (and rapidly discon ⁇ necting it) are those normally used for fixed buoyancy floats.
- the activation of the mouth as also the meas ⁇ urement of the distance from the seabed can be effected in various ways and, with electronic instruments, with great accuracy, it is preferable to use a mechanical-type activa- tion, in particular by means of simple leverages which con- nect the bottom with the mouth.
- the leverage can be blocked when it reaches the threshold, so that the pulling operations take place under definite conditions .
- a further alternative embodiment envisages a further air nozzle, with a greater opening than the previous one, which is activated by the same mechanism under the sole condition of the float in a descending movement to have a greater air flow.
- the two nozzles are integrated in a single nozzle with a variable passage (fixed for main ⁇ tenance and with a large opening for a rapid intervention) . With respect to the height variation of the inlet mouth, this can be obtained, for example, with telescopic pipes or with a flexible pipe by exploiting its overlength to allow the swing.
- dis ⁇ charge valves activated for rapid emptying, which are also known.
- the air feeding is guaranteed by a connection to one or more compressed air hoses connected to a surface com ⁇ pressor.
- the float has a regulation of the discharge level of the internally entrapped air linked to the distance from the seabed: for safety purposes, the air feeding is continuous (or high frequency intermittent) and takes place by means of a preferably small passage nozzle; an air discharge effected by means of a piping whose mouth is positioned inside the case formed by the float at a cer- tain level, evacuates the excess air and thus establishes the effective volume of remaining air and consequently the effective buoyancy of the float.
- the range of this mouth can cover the height of the float (which will therefore be of the variable buoyancy type) or only a part (lower) of the height, and conse ⁇ quently the float will have a partially variable buoyancy.
- the mouth is activated by a mechanism which moves it in ac ⁇ cordance with the distance from the seabed (it rises as the float moves away from the seabed and descends as the latter moves nearer the seabed) .
- the regulation is more preferably ⁇ effected at a certain distance threshold, over which the mouth is raised to reduce the buoyancy or, in inverse move ⁇ ment, up to which the mouth descends to increase the buoy ⁇ ancy.
- the effect is that when the span height (festooning) increases under the float, this tends to reduce the buoy ⁇ ancy and vice versa. This guarantees festooning and, in terms of safety, it ensures that the pipeline never reaches the waterline.
- Figure 1 represents the equipment (A) in accordance with the invention connected to the pipeline (C) in which f (height) is the distance of the pipeline (C) from the sea ⁇ bed (F) .
- the equipment (A) comprises: the prismatic float (G) , at least partially open be ⁇ low, a piping (T) , connected to a compressor, to fill the float with air through a nozzle (U) , a pipe (B) for the air discharge, equipped with an inlet mouth (Bi) and an outlet mouth (B u ) , an actuation leverage (L) of the inlet mouth.
- the fixed buoyancy level (I 3 ) and variable buoyancy swing (e) are also represented.
- Figure 2 indicates the equipment (A) of figure 1 which also has a further air nozzle (W) which is activated by the same mechanism (L) under the sole condition of the float in a descending movement .
- Figure 3 schematizes the system according to the in ⁇ vention.
- the head tug R pulls the pipeline (C) by means of the towing cable (N) .
- the various pieces of equipment (A) are connected to the pipeline in certain points in accordance with the invention, which are filled with air thanks to the compressor (P) installed in the head tug (R) .
- (f) again in ⁇ dicates the festooning height, i.e. the distance from the seabed (F) of a certain point of the piping to which the equipment is applied.
- Example A particularly long steel pipe is considered, having a length of several kilometers, for example 10 km long, with a certain diameter, for example 14" and a certain thick ⁇ ness, for example 14 mm.
- the pipeline is already resting on the seabed following a previous prefabrication and laying operation and this piping must be transferred to another definite site.
- Said pipeline has a concrete coating to weigh it down in order to stabilize it in the final site. It has a certain net weight in the water, for example 250 kg/m.
- a certain friction coefficient is considered with the seabed, for example having a value 1.
- a certain weight tol ⁇ erance due to various uncertainties (steel thickness, con ⁇ crete thickness, concrete composition, absorption) , is con ⁇ sidered, for example ⁇ 4%, with a consequent variability of
- Floats are arranged in the pipeline according to the invention, of the type schematized in figure 1, with a buoyancy of about 11 tons at a distance of 48 m to obtain a festooning in the order of tens of centimeters of height and the threshold can be correspondingly fixed at 20 cm.
- the variability of the buoyancy in this case can be ⁇ 2000 kg.
- This buoyancy variability is obtained by filling the floats with air, by introducing or discharging air which is supplied by one or more suitable pipes connected with a compressor on board of a tug or boat.
- a head tug is envisaged, which pulls the pipeline and is connected thereto, as well as with the pulling cable, also with pipes for bringing air to the floats (typically two for safety reasons) , the pipeline itself (equipped with a pulling head) on which the variable buoyancy floats with air are installed, possibly fixed buoyancy floats (with or without air) , a tail tug for the counter-pulling, connected to the pipeline (with a further pulling head) and also pos ⁇ sibly connected to the air pipes and optionally equipped with a compressor.
Abstract
Description
Claims
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE602005011171T DE602005011171D1 (en) | 2004-10-25 | 2005-07-14 | METHOD, SYSTEM AND DEVICE FOR TOWING UNDERWATER TUBES |
EA200700585A EA010342B1 (en) | 2004-10-25 | 2005-07-14 | Process, system and equipment for the towing of underwater pipelines |
AU2005299054A AU2005299054B2 (en) | 2004-10-25 | 2005-07-14 | Process, system and equipment for the towing of underwater pipelines |
US11/577,032 US7985036B2 (en) | 2004-10-25 | 2005-07-14 | Process, system and equipment for the towing of underwater pipelines |
CN2005800336863A CN101036015B (en) | 2004-10-25 | 2005-07-14 | Process, system and equipment for the towing of underwater pipelines |
EP05766891A EP1809938B1 (en) | 2004-10-25 | 2005-07-14 | Process, system and equipment for the towing of underwater pipelines |
NO20071548A NO20071548L (en) | 2004-10-25 | 2007-03-23 | Method, system and equipment for towing of subsea pipelines |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI2004A002021 | 2004-10-25 | ||
IT002021A ITMI20042021A1 (en) | 2004-10-25 | 2004-10-25 | PROCEDURE SYSTEM AND EQUIPMENT FOR THE DUCT OF SUBMARINE PIPES |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006045357A1 true WO2006045357A1 (en) | 2006-05-04 |
Family
ID=34956517
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP2005/007724 WO2006045357A1 (en) | 2004-10-25 | 2005-07-14 | Process, system and equipment for the towing of underwater pipelines |
Country Status (10)
Country | Link |
---|---|
US (1) | US7985036B2 (en) |
EP (1) | EP1809938B1 (en) |
CN (1) | CN101036015B (en) |
AT (1) | ATE414866T1 (en) |
AU (1) | AU2005299054B2 (en) |
DE (1) | DE602005011171D1 (en) |
EA (1) | EA010342B1 (en) |
IT (1) | ITMI20042021A1 (en) |
NO (1) | NO20071548L (en) |
WO (1) | WO2006045357A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2435316A (en) * | 2006-02-10 | 2007-08-22 | Jean-Baptiste Pose | Method and apparatus for offshore pipe installation |
WO2008017463A1 (en) | 2006-08-10 | 2008-02-14 | Saipem S.P.A | Device and method for the towing of underwater pipelines |
ITMI20090092A1 (en) * | 2009-01-27 | 2010-07-28 | Saipem Spa | EQUIPMENT, SYSTEM AND PROCEDURE FOR THE DUCT OF SUBMARINE PIPES |
WO2019243834A1 (en) | 2018-06-22 | 2019-12-26 | Subsea 7 Limited | Launching elongate subsea structures |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB0811437D0 (en) * | 2008-06-20 | 2008-07-30 | Saipem Spa | Pipe-laying vessel and method of laying a pipeline |
GB2474211B (en) * | 2008-08-13 | 2012-05-02 | Schlumberger Holdings | Umbilical management system and method for subsea well intervention |
ITTO20091043A1 (en) * | 2009-12-24 | 2011-06-25 | Saipem Spa | RAMP OF LAUNCHING, UNIT OF LAUNCH INCLUDING SUCH VIEW RAMP AND DRIVING METHOD OF SUCH VARROW UNIT |
US8961071B2 (en) * | 2013-03-15 | 2015-02-24 | Chevron U.S.A. Inc. | Systems and methods for protecting subsea pipeline from excessive stress or fatigue loading |
GB2522197B (en) * | 2014-01-15 | 2018-08-01 | Acergy France SAS | Transportation and installation of subsea rigid tie-in connections |
TWI571582B (en) * | 2015-06-24 | 2017-02-21 | Ian Larsen | Large diameter submerged pipe counterweight and its installation method |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1434357A (en) * | 1972-09-18 | 1976-05-05 | Duyster T H | Method of constructing a long pipeline on the floor of a body of water |
US4011729A (en) | 1974-10-03 | 1977-03-15 | C. G. Doris | Device for laying submarine pipelines |
US4037425A (en) * | 1975-06-09 | 1977-07-26 | H. B. Contracting Ltd. | Buoyancy apparatus |
US4107933A (en) | 1976-06-04 | 1978-08-22 | Compagnie Generale Pour Les Developpements Operationnels Des Richesses Sous-Marines "C. G. Doris" | Apparatus and method for towing a pipeline in a body of water |
US4121529A (en) | 1976-09-20 | 1978-10-24 | B & B Insulation, Inc. | Buoyancy systems |
US4138853A (en) | 1976-10-01 | 1979-02-13 | Compagnie Generale Pour Les Developpements Operationnels Des Richesses Sous-Marines "C.G. Doris" | Device for positioning a submerged pipeline |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3727417A (en) * | 1971-07-23 | 1973-04-17 | Mc Dermott J & Co Inc | Submarine pipeline laying apparatus |
US4183697A (en) * | 1976-01-27 | 1980-01-15 | Compagnie Generale Pour Les Developpements Operationnels Des Richesses Sous-Marines "C.G. Doris" | Laying of underwater pipelines |
-
2004
- 2004-10-25 IT IT002021A patent/ITMI20042021A1/en unknown
-
2005
- 2005-07-14 AU AU2005299054A patent/AU2005299054B2/en not_active Ceased
- 2005-07-14 CN CN2005800336863A patent/CN101036015B/en not_active Expired - Fee Related
- 2005-07-14 AT AT05766891T patent/ATE414866T1/en not_active IP Right Cessation
- 2005-07-14 EA EA200700585A patent/EA010342B1/en not_active IP Right Cessation
- 2005-07-14 US US11/577,032 patent/US7985036B2/en not_active Expired - Fee Related
- 2005-07-14 WO PCT/EP2005/007724 patent/WO2006045357A1/en active Application Filing
- 2005-07-14 EP EP05766891A patent/EP1809938B1/en not_active Not-in-force
- 2005-07-14 DE DE602005011171T patent/DE602005011171D1/en not_active Expired - Fee Related
-
2007
- 2007-03-23 NO NO20071548A patent/NO20071548L/en not_active Application Discontinuation
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB1434357A (en) * | 1972-09-18 | 1976-05-05 | Duyster T H | Method of constructing a long pipeline on the floor of a body of water |
US4011729A (en) | 1974-10-03 | 1977-03-15 | C. G. Doris | Device for laying submarine pipelines |
US4037425A (en) * | 1975-06-09 | 1977-07-26 | H. B. Contracting Ltd. | Buoyancy apparatus |
US4107933A (en) | 1976-06-04 | 1978-08-22 | Compagnie Generale Pour Les Developpements Operationnels Des Richesses Sous-Marines "C. G. Doris" | Apparatus and method for towing a pipeline in a body of water |
US4121529A (en) | 1976-09-20 | 1978-10-24 | B & B Insulation, Inc. | Buoyancy systems |
US4138853A (en) | 1976-10-01 | 1979-02-13 | Compagnie Generale Pour Les Developpements Operationnels Des Richesses Sous-Marines "C.G. Doris" | Device for positioning a submerged pipeline |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2435316A (en) * | 2006-02-10 | 2007-08-22 | Jean-Baptiste Pose | Method and apparatus for offshore pipe installation |
WO2008017463A1 (en) | 2006-08-10 | 2008-02-14 | Saipem S.P.A | Device and method for the towing of underwater pipelines |
EA014151B1 (en) * | 2006-08-10 | 2010-10-29 | САЙПЕМ С.п.А. | Device and method for the towing of underwater pipelines |
US8066450B2 (en) | 2006-08-10 | 2011-11-29 | Saipem S.P.A. | Device and method for the towing of underwater pipelines |
AU2007283059B2 (en) * | 2006-08-10 | 2012-07-05 | Saipem S.P.A | Device and method for the towing of underwater pipelines |
ITMI20090092A1 (en) * | 2009-01-27 | 2010-07-28 | Saipem Spa | EQUIPMENT, SYSTEM AND PROCEDURE FOR THE DUCT OF SUBMARINE PIPES |
WO2010086116A1 (en) | 2009-01-27 | 2010-08-05 | Saipem S.P.A. | Submarine pipeline towing equipment, system and process |
US8647016B2 (en) | 2009-01-27 | 2014-02-11 | Saipem S.P.A. | Submarine pipeline towing equipment, system and process |
EA019756B1 (en) * | 2009-01-27 | 2014-06-30 | САЙПЕМ С.п.А. | Submarine pipeline towing equipment, system and process |
AU2010209955B2 (en) * | 2009-01-27 | 2015-06-25 | Saipem S.P.A. | Submarine pipeline towing equipment, system and process |
WO2019243834A1 (en) | 2018-06-22 | 2019-12-26 | Subsea 7 Limited | Launching elongate subsea structures |
US11884368B2 (en) | 2018-06-22 | 2024-01-30 | Subsea 7 Limited | Launching elongate subsea structures |
Also Published As
Publication number | Publication date |
---|---|
ATE414866T1 (en) | 2008-12-15 |
AU2005299054A1 (en) | 2006-05-04 |
CN101036015A (en) | 2007-09-12 |
ITMI20042021A1 (en) | 2005-01-25 |
EP1809938A1 (en) | 2007-07-25 |
EA200700585A1 (en) | 2007-10-26 |
DE602005011171D1 (en) | 2009-01-02 |
AU2005299054B2 (en) | 2011-02-03 |
US7985036B2 (en) | 2011-07-26 |
US20080095583A1 (en) | 2008-04-24 |
EP1809938B1 (en) | 2008-11-19 |
NO20071548L (en) | 2007-05-16 |
EA010342B1 (en) | 2008-08-29 |
CN101036015B (en) | 2011-01-19 |
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