WO2009005359A1 - A method and a device for hoisting an item - Google Patents

A method and a device for hoisting an item Download PDF

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Publication number
WO2009005359A1
WO2009005359A1 PCT/NO2008/000225 NO2008000225W WO2009005359A1 WO 2009005359 A1 WO2009005359 A1 WO 2009005359A1 NO 2008000225 W NO2008000225 W NO 2008000225W WO 2009005359 A1 WO2009005359 A1 WO 2009005359A1
Authority
WO
WIPO (PCT)
Prior art keywords
hoisting
item
rope
coupling
ropes
Prior art date
Application number
PCT/NO2008/000225
Other languages
French (fr)
Inventor
Yngvar BORØY
Original Assignee
National Oilwell Norway As
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
Application filed by National Oilwell Norway As filed Critical National Oilwell Norway As
Publication of WO2009005359A1 publication Critical patent/WO2009005359A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
    • B66C13/00—Other constructional features or details
    • B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B27/00—Arrangement of ship-based loading or unloading equipment for cargo or passengers
    • B63B27/10—Arrangement of ship-based loading or unloading equipment for cargo or passengers of cranes

Definitions

  • This invention relates to a method for hoisting an item. More particularly, it relates to a method for hoisting an item at sea, in which the item is moved between different height lev- els by means of a hoisting device, and in which the item and at least two hoisting ropes are connected to a first coupling.
  • the at least two hoisting ropes are brought to extend substantially parallel along at least part of the distance between the item and the hoisting device at least during a portion of the hoisting operation, one of the at least two hoisting ropes being formed by a first hoisting rope which is connected to the hoisting device, and one of the at least two hoisting ropes being formed by a second hoisting rope which is connected, at its upper end portion, to a releasable sec- ond coupling which is located in a load-bearing suspension means on a vessel, and the first hoisting rope being disconnected, when the item is to be lowered further, from the first coupling located at a lower height level, as the load is transferred to the second hoisting rope, after which the first hoisting rope is connected to the second coupling which is then lifted out of the suspension means and lowered further into the water.
  • the invention also includes a device for practising the method.
  • fibre ropes for operations of this kind means that conditions, which are not normally restrictive when steel ropes are used, have to be taken into consideration.
  • the useful life of a fibre rope which includes a considerable portion of coal fibres, is directly dependent on the number of bending cycles to which the fibre rope is subjected.
  • Fibre ropes do not have sufficient stability of shape either, for them to be reeled into several layers on a drum when there is full lifting power on the fibre rope.
  • Fibre ropes which are designed to transfer the lifting power to a reel, are relatively expensive.
  • the invention has for its object to remedy or reduce at least one of the drawbacks of the prior art .
  • a method in accordance with the invention for hosting an item at sea, in which the item is moved between different height levels by means of a hoisting device, and in which the item and at least two hoisting ropes are connected to a first coupling, is characterized by the at least two hoisting ropes being brought to extend substantially parallel along at least part of the distance between the item and the hoisting device and at least during a portion of the hoisting operation.
  • One of the at least two hoisting ropes is formed by a first hoisting rope which is connected to the hoisting device, and one of the at least two hoisting ropes is formed by a second hoisting rope which is connected, at its upper end portion, to a releasable second coupling which is located in a load- bearing suspension means on a vessel.
  • the first hoisting rope is disconnected from the first coupling located at a lower height level, the load being transferred to the second hoisting rope, after which the first hoisting rope is connected to the second coupling which is then lifted out of the suspension means and lowered further into the water.
  • the method is carried out by means of the at least two hoisting ropes extending substantially parallel along at least part of the distance between the item and the hoisting device at least during a portion of the hoisting operation, the sec- ond hoisting rope being connected, at its upper end portion, to the releasable second coupling which is in the load- bearing suspension means on the vessel, and the first hoisting rope being arranged to be releasable from the first coupling located at a lower height level, when the item is to be lowered further, whereby the lifting power is transferred to the second hoisting rope.
  • the load-bearing suspension means may be heave-compensated.
  • the first hoisting rope is arranged to be connectable to the second coupling, the second coupling subsequently being lowerable further into the water.
  • additional lengths of the second rope may be connected in a similar manner.
  • the method and the device according to the invention enable the use of relatively inexpensive fibre ropes which may not be subjected to repeated bending under load.
  • the fibre rope is subjected to substantial load forces only when it is hanging in the sea and not while it is lying on the drum or over an idle roller.
  • Figure 1 shows a section of a vessel which is provided with a lifting device and a reel for fibre rope, and where an item is being hoisted in the sea;
  • Figure 2 shows the item after it has been lowered to an in- 5 termediate level in the sea
  • Figure 3 shows the item just before it is placed on the seabed.
  • the reference numeral 1 indicates a vessel which is provided with a hoisting device 2 with a firsto hoisting rope 4 in the form of a steel rope, and a reel 6 for a second hoisting rope 8 in the form of a fibre rope.
  • the first hoisting rope 4 is connected via a first coupling 10 and a leader 12 to an item 14.
  • the second hoisting rope 8 extends from the reel 6 over a deflection sheave 16 to thes first coupling 10 to which also the second hoisting rope 8 is connected.
  • a second coupling 18 is located in a suspension means 20 on the vessel 1, the suspension means 20 being sized for taking the load of the item 14 and the lifting equipment 8, 10, 12o located between the item 14 and the second coupling 18.
  • the load from the item 14 is thereby carried by the suspension means 20 via the second coupling 18.
  • the first hoisting rope 4 is then disconnected from the first coupling 10, for example by means of a so-called ROV (Remote- Operated Vehicle) 26.
  • ROV Remote- Operated Vehicle
  • the first hoisting rope 4 is then hoisted and connected to the second coupling 18 which is then lifted from the suspen- sion means 20 and lowered until the item 14 approaches the seabed 28, see figure 3.
  • the item 14 is disposed at adjacent equipment, not shown, on the seabed 28.
  • the leader 12 is then disconnected from the item 14, after which the hoisting ropes 4, 8 and couplings 10, 18 are returned into their respective initial positions.
  • one length of second hoisting rope 8 is used.
  • the method and the device according to the invention are of even greater interest for sea depths at which several subsequent second hoisting ropes 8 have to be applied.
  • hoisting ropes 4, 8 and couplings 10, 16 are connected to each other as described above . After the item 14 has been connected to the leader 12, the item 14 can be hoisted up by carrying out the operations in the reverse order.
  • the suspension means 20 may be heave-compensated in a manner known per se.

Abstract

A method for hoisting an item (14) at sea, in which the item (14) is moved between different height levels by means of a hoisting device (2), and in which the item (14) and at least two hoisting ropes (4, 8) are connected to a first coupling (10), and in which the at least two hoisting ropes (4, 8) are brought to extend substantially parallel along at least part of the distance between the item (14) and hoisting device (2) at least during part of the hoisting operation, one of the at least two hoisting ropes (4, 8) being formed by a first hoisting rope (4) which is connected to the hoisting device (2), and one of the at least two hoisting ropes (4, 8) being formed by a second hoisting rope (8) which is connected, at its upper end portion (24), to a releasable second coupling (18) which is in a load-bearing suspension means (20) on a vessel (1), and the first hoisting rope (4) being released, when the item (14) is to be lowered further, from a first coupling (10) located at a lower height level, as the lifting power is transferred to a second hoisting rope (8), after which the first hoisting rope (4) is connected to the second coupling (18) which is then lifted out of the suspension means (20) and lowered further into the water.

Description

A METHOD AND A DEVICE FOR HOISTING AN ITEM
This invention relates to a method for hoisting an item. More particularly, it relates to a method for hoisting an item at sea, in which the item is moved between different height lev- els by means of a hoisting device, and in which the item and at least two hoisting ropes are connected to a first coupling. The at least two hoisting ropes are brought to extend substantially parallel along at least part of the distance between the item and the hoisting device at least during a portion of the hoisting operation, one of the at least two hoisting ropes being formed by a first hoisting rope which is connected to the hoisting device, and one of the at least two hoisting ropes being formed by a second hoisting rope which is connected, at its upper end portion, to a releasable sec- ond coupling which is located in a load-bearing suspension means on a vessel, and the first hoisting rope being disconnected, when the item is to be lowered further, from the first coupling located at a lower height level, as the load is transferred to the second hoisting rope, after which the first hoisting rope is connected to the second coupling which is then lifted out of the suspension means and lowered further into the water. The invention also includes a device for practising the method.
During hoisting operations at sea, in which heavy items of weights in the order of several hundred tonnes are to be placed on the seabed, for example, the availability of steel ropes of sufficient combined strength and length has become restrictive to how big items can be handled. The seabed may be several kilometres below the sea surface and, thereby, the weight of the steel rope gets to be considerable.
It may therefore be necessary to use fibre ropes in order for the largest items to be set in deep water.
The utilization of fibre ropes for operations of this kind means that conditions, which are not normally restrictive when steel ropes are used, have to be taken into consideration. For example, the useful life of a fibre rope, which includes a considerable portion of coal fibres, is directly dependent on the number of bending cycles to which the fibre rope is subjected.
Hoisting operations of this kind are often heave-compensated and, therefore, the lifting rope will continuously be reeled in and out on the winch in consequence of the heave motion of the lifting vessel. Even if the item being lifted is at rest relative to the seabed, the lifting rope will still be reeled in and out, whereby the life of a fibre rope is reduced relatively rapidly.
Fibre ropes do not have sufficient stability of shape either, for them to be reeled into several layers on a drum when there is full lifting power on the fibre rope.
It is known to coil a fibre rope several turns like a belt around two parallel drums (traction winch) before the fibre rope is pulled by a relatively small force onto a storage reel, often in several layers.
However, such a solution involves that the fibre rope is sub- jected to bending every time it enters the drum and every time it leaves the drum. If the fibre rope has been coiled in five parallel turns around the two drums, it will be subjected all the time to repeated bending at ten points, which reduces its life to an unacceptable extent.
Fibre ropes, which are designed to transfer the lifting power to a reel, are relatively expensive.
The invention has for its object to remedy or reduce at least one of the drawbacks of the prior art .
The object is achieved in accordance with the invention through the features which are specified in the description below and in the claims that follow.
A method in accordance with the invention for hosting an item at sea, in which the item is moved between different height levels by means of a hoisting device, and in which the item and at least two hoisting ropes are connected to a first coupling, is characterized by the at least two hoisting ropes being brought to extend substantially parallel along at least part of the distance between the item and the hoisting device and at least during a portion of the hoisting operation. One of the at least two hoisting ropes is formed by a first hoisting rope which is connected to the hoisting device, and one of the at least two hoisting ropes is formed by a second hoisting rope which is connected, at its upper end portion, to a releasable second coupling which is located in a load- bearing suspension means on a vessel. When the item is to be lowered further, the first hoisting rope is disconnected from the first coupling located at a lower height level, the load being transferred to the second hoisting rope, after which the first hoisting rope is connected to the second coupling which is then lifted out of the suspension means and lowered further into the water. The method is carried out by means of the at least two hoisting ropes extending substantially parallel along at least part of the distance between the item and the hoisting device at least during a portion of the hoisting operation, the sec- ond hoisting rope being connected, at its upper end portion, to the releasable second coupling which is in the load- bearing suspension means on the vessel, and the first hoisting rope being arranged to be releasable from the first coupling located at a lower height level, when the item is to be lowered further, whereby the lifting power is transferred to the second hoisting rope.
The load-bearing suspension means may be heave-compensated.
The first hoisting rope is arranged to be connectable to the second coupling, the second coupling subsequently being lowerable further into the water.
If the water depth is larger than the combined length of the first and second hoisting ropes, additional lengths of the second rope may be connected in a similar manner.
The method and the device according to the invention enable the use of relatively inexpensive fibre ropes which may not be subjected to repeated bending under load.
According to the invention the fibre rope is subjected to substantial load forces only when it is hanging in the sea and not while it is lying on the drum or over an idle roller.
In what follows is described a non-limiting example of a preferred method and embodiment which are visualized in the accompanying drawings, in which: Figure 1 shows a section of a vessel which is provided with a lifting device and a reel for fibre rope, and where an item is being hoisted in the sea;
Figure 2 shows the item after it has been lowered to an in- 5 termediate level in the sea; and
Figure 3 shows the item just before it is placed on the seabed.
In the drawings the reference numeral 1 indicates a vessel which is provided with a hoisting device 2 with a firsto hoisting rope 4 in the form of a steel rope, and a reel 6 for a second hoisting rope 8 in the form of a fibre rope.
The first hoisting rope 4 is connected via a first coupling 10 and a leader 12 to an item 14. The second hoisting rope 8 extends from the reel 6 over a deflection sheave 16 to thes first coupling 10 to which also the second hoisting rope 8 is connected.
A second coupling 18 is located in a suspension means 20 on the vessel 1, the suspension means 20 being sized for taking the load of the item 14 and the lifting equipment 8, 10, 12o located between the item 14 and the second coupling 18.
In figure 1 the item 14 has been lifted off the vessel 1 and lowered sufficiently down under the sea surface 22 for the second hoisting rope 8 to be connected to the first coupling 10. 5 The item 14 is then lowered while, at the same time, the second hoisting rope 8 is paid out from the reel 6 until the first hoisting rope 4 has been paid out to near its full length, in the order of 1000 m, for example. The upper end portion 24 of the second hoisting rope 8 is connected to the second coupling 18, after which the first hoisting rope 4 is relieved, see figure 2.
The load from the item 14 is thereby carried by the suspension means 20 via the second coupling 18.
The first hoisting rope 4 is then disconnected from the first coupling 10, for example by means of a so-called ROV (Remote- Operated Vehicle) 26.
The first hoisting rope 4 is then hoisted and connected to the second coupling 18 which is then lifted from the suspen- sion means 20 and lowered until the item 14 approaches the seabed 28, see figure 3.
The item 14 is disposed at adjacent equipment, not shown, on the seabed 28. The leader 12 is then disconnected from the item 14, after which the hoisting ropes 4, 8 and couplings 10, 18 are returned into their respective initial positions.
In this preferred exemplary embodiment one length of second hoisting rope 8 is used. The method and the device according to the invention are of even greater interest for sea depths at which several subsequent second hoisting ropes 8 have to be applied.
If an item 14 is to be hoisted from the seabed 28, hoisting ropes 4, 8 and couplings 10, 16 are connected to each other as described above . After the item 14 has been connected to the leader 12, the item 14 can be hoisted up by carrying out the operations in the reverse order.
In an alternative embodiment, not shown, the suspension means 20 may be heave-compensated in a manner known per se.

Claims

C l a i m s
1. A method for hoisting an item (14) at sea, in which the item (14) is moved between different height levels by means of a hoisting device (2) , and in which the item (14) and at least two hoisting ropes (4, 8) are connected to a first coupling (10), c h a r a c t e r i z e d i n that the at least two hoisting ropes (4, 8) are brought to extend substantially parallel along at least part of the distance between the item (14) and hoisting device (2) at least during part of the hoisting operation, one of the at least two hoisting ropes (4, 8) being formed by a first hoisting rope (4) which is connected to the hoisting device (2) , and one of the at least two hoisting ropes (4, 8) being formed by a second hoisting rope (8) which is connected, at its upper end portion (24) , to a releas- able second coupling (18) which is in a load-bearing suspension means (20) on a vessel (1) , and the first hoisting rope (4) being released, when the item (14) is to be lowered further, from a first coupling (10) located at a lower height level, as the lifting power is transferred to a second hoisting rope (8) , after which the first hoisting rope (4) is connected to the second coupling (18) which is then lifted off the sus- pension means (20) and lowered further into the water.
2. The method in accordance with claim 1, c h a r a c t e r i z e d i n that several subsequent lengths of the second hoisting rope (8) are connected to corresponding couplings.
3. A device for hoisting an item (14) at sea, in which the item (14) is moved between different height levels by means of a hoisting device (2) , and in which the item (14) and at least two hoisting ropes (4, 8) are connected to a first coupling (10), c h a r a c t e r i z e d i n that the at least two hoisting ropes (4, 8) extend substantially parallel along at 5 least part of the distance between the item (14) and hoisting device (2) at least during part of the hoisting operation, one of the at least two hoisting ropes (4, 8) being formed by a first hoisting rope (4) which is connected to the hoisting device (2), and one ofo the at least two hoisting ropes (4, 8) being formed by a second hoisting rope (8) which is connected, at its upper end portion (24) , to a releasable second coupling (18) which is in a load-bearing suspension means (20) on a vessel (1), and the first hoisting rope (4)s being arranged to be released, when the item (14) is to be lowered further, from a first coupling (10) located at a lower height level, whereby the lifting power is transferred to the second hoisting rope (8) .
4. The device in accordance with claim 3, c ha r a c -o t e r i z e d i n that the first hoisting rope (4) is arranged to be connectable to the second coupling (18) which may then be lifted from the suspension means (20) and then lowered further into the water.
5. The device in accordance claim 3, c h a r a c -5 t e r i z e d i n that the suspension means (20) is heave-compensated.
PCT/NO2008/000225 2007-07-05 2008-06-19 A method and a device for hoisting an item WO2009005359A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20073443A NO330923B1 (en) 2007-07-05 2007-07-05 Procedure for hoisting a package at sea
NO20073443 2007-07-05

Publications (1)

Publication Number Publication Date
WO2009005359A1 true WO2009005359A1 (en) 2009-01-08

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PCT/NO2008/000225 WO2009005359A1 (en) 2007-07-05 2008-06-19 A method and a device for hoisting an item

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WO (1) WO2009005359A1 (en)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010046649A1 (en) * 2008-10-22 2010-04-29 Subsea7 Limited Offshore lifting operations
WO2010093251A1 (en) * 2009-02-16 2010-08-19 National Oilwell Varco Norway As Method and device for hoisting an item by means of a crane
CN102733362A (en) * 2012-07-05 2012-10-17 南通中远船务工程有限公司 Hoisting method for super-tonnage tower head platforms of marine wind power installation vessels
GB2466983B (en) * 2009-01-16 2013-10-30 Subsea 7 Ltd A method and apparatus for supporting a load
CN104540767A (en) * 2012-08-22 2015-04-22 罗尔斯-罗依斯海运有限公司 Method for lowering and hoisting of a load to or from an ocean floor
WO2015147647A1 (en) * 2014-03-28 2015-10-01 Bluemarine Offshore Yard Service B.V. Method for lowering a subsea structure having a substantially flat support base into the water through the splash zone
EP3293142A1 (en) * 2011-04-01 2018-03-14 Foster Wheeler USA Corporation Method and system for lifting and manipulating a load
WO2018080304A1 (en) * 2016-10-25 2018-05-03 Itrec B.V. Rope handling system, vessel provided with such a rope handling system and method of handling synthetic rope
WO2018131995A1 (en) * 2017-01-16 2018-07-19 Itrec B.V. Deepwater hoisting system and method
NO346359B1 (en) * 2016-11-07 2022-06-27 Heerema Marine Contractors Nl A method of handing over a load, and an arrangement to hand over a load
WO2022169367A1 (en) 2021-02-08 2022-08-11 National Oilwell Varco Norway As Apparatus, system and methods for moving a load between a floating vessel and a submerged position
EP4197954A1 (en) * 2021-12-16 2023-06-21 Grant Prideco, Inc. Multi-winch hoisting system and method for combining multiple-winches in a hoisting system

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US4892202A (en) * 1988-04-28 1990-01-09 Amca International Corporation Deepwater extended hook travel attachment
US4951924A (en) * 1988-02-01 1990-08-28 Mcdermott International, Inc. Deepwater subsea lowering/lifting system
US20050191165A1 (en) * 2002-01-24 2005-09-01 Willis Stewart K. Method and apparatus for deploying articles in deep waters

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EP0312336A1 (en) * 1987-10-12 1989-04-19 Heerema Engineering Service B.V. Improvements in hoisting devices
US4951924A (en) * 1988-02-01 1990-08-28 Mcdermott International, Inc. Deepwater subsea lowering/lifting system
US4892202A (en) * 1988-04-28 1990-01-09 Amca International Corporation Deepwater extended hook travel attachment
US20050191165A1 (en) * 2002-01-24 2005-09-01 Willis Stewart K. Method and apparatus for deploying articles in deep waters

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010046649A1 (en) * 2008-10-22 2010-04-29 Subsea7 Limited Offshore lifting operations
GB2466983B (en) * 2009-01-16 2013-10-30 Subsea 7 Ltd A method and apparatus for supporting a load
US8950997B2 (en) 2009-01-16 2015-02-10 Subsea 7 Limited Method and apparatus for supporting a load
KR101711271B1 (en) 2009-02-16 2017-02-28 내쇼날 오일웰 파르코 노르웨이 에이에스 Method and device for hoisting an item by means of a crane
WO2010093251A1 (en) * 2009-02-16 2010-08-19 National Oilwell Varco Norway As Method and device for hoisting an item by means of a crane
NO333202B1 (en) * 2009-02-16 2013-04-08 Nat Oilwell Varco Norway As Method and apparatus for hoisting a package from a crane
US8882427B2 (en) 2009-02-16 2014-11-11 National Oilwell Varco Norway As Method and device for hoisting an item by means of a crane
KR20150002866A (en) * 2009-02-16 2015-01-07 내쇼날 오일웰 파르코 노르웨이 에이에스 Method and device for hoisting an item by means of a crane
EP3293142A1 (en) * 2011-04-01 2018-03-14 Foster Wheeler USA Corporation Method and system for lifting and manipulating a load
CN102733362A (en) * 2012-07-05 2012-10-17 南通中远船务工程有限公司 Hoisting method for super-tonnage tower head platforms of marine wind power installation vessels
CN104540767A (en) * 2012-08-22 2015-04-22 罗尔斯-罗依斯海运有限公司 Method for lowering and hoisting of a load to or from an ocean floor
US20170174480A1 (en) * 2014-03-28 2017-06-22 Bluemarine Offshore Yard Service B.V. Method for lowering a subsea structure having a substantially flat support base into the water through the splash zone
US10239734B2 (en) 2014-03-28 2019-03-26 Bluemarine Offshore Yard Service B.V. Method for lowering a subsea structure having a substantially flat support base into the water through the splash zone
WO2015147647A1 (en) * 2014-03-28 2015-10-01 Bluemarine Offshore Yard Service B.V. Method for lowering a subsea structure having a substantially flat support base into the water through the splash zone
NL2012527A (en) * 2014-03-28 2016-01-08 Bluemarine Offshore Yard Service Bv Method for lowering a subsea structure having a substantially flat support base into the water through the splash zone.
CN109890746A (en) * 2016-10-25 2019-06-14 伊特里克公司 Rope handling system, vessel provided with such a rope handling system and method of handling synthetic ropes
NL2017674B1 (en) * 2016-10-25 2018-05-04 Itrec Bv Rope handling system, vessel provided with such a rope handling system and method of handling synthetic rope
WO2018080304A1 (en) * 2016-10-25 2018-05-03 Itrec B.V. Rope handling system, vessel provided with such a rope handling system and method of handling synthetic rope
NO346359B1 (en) * 2016-11-07 2022-06-27 Heerema Marine Contractors Nl A method of handing over a load, and an arrangement to hand over a load
WO2018131995A1 (en) * 2017-01-16 2018-07-19 Itrec B.V. Deepwater hoisting system and method
CN110382346A (en) * 2017-01-16 2019-10-25 伊特里克公司 Deep water hoisting system and method
US10858223B2 (en) 2017-01-16 2020-12-08 Itrec B.V. Deepwater hoisting system and method
CN110382346B (en) * 2017-01-16 2021-10-01 伊特里克公司 Deep water hoisting system and method
WO2022169367A1 (en) 2021-02-08 2022-08-11 National Oilwell Varco Norway As Apparatus, system and methods for moving a load between a floating vessel and a submerged position
EP4197954A1 (en) * 2021-12-16 2023-06-21 Grant Prideco, Inc. Multi-winch hoisting system and method for combining multiple-winches in a hoisting system

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Publication number Publication date
NO20073443L (en) 2009-01-06
NO330923B1 (en) 2011-08-15

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