US3685479A - Anchor-cable systems - Google Patents

Anchor-cable systems Download PDF

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Publication number
US3685479A
US3685479A US886539A US3685479DA US3685479A US 3685479 A US3685479 A US 3685479A US 886539 A US886539 A US 886539A US 3685479D A US3685479D A US 3685479DA US 3685479 A US3685479 A US 3685479A
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United States
Prior art keywords
cable
burial
anchor
finned
fin
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Expired - Lifetime
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US886539A
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English (en)
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Peter Bruce
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Individual
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Priority claimed from GB5479769A external-priority patent/GB1299366A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/24—Anchors
    • B63B21/38—Anchors pivoting when in use
    • B63B21/44—Anchors pivoting when in use with two or more flukes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00—Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/24—Anchors
    • B63B21/26—Anchors securing to bed
    • B63B2021/262—Anchors securing to bed by drag embedment

Definitions

  • An anchor for mooring a vessel to a mooring bed includes at least one fluke attached to a shank of the anchor and inclined relative thereto to cause penetration of the anchor into the mooring bed on horizontal movement of the anchor.
  • Stabilizer fin or fins is mounted on an extension of the shank part and spaced from the fluke such that, on penetration of the anchor into the bed, any pivoting of the shank part to decrease the angle of attack of the fluke relative to the bed is counteracted.
  • the anchor-cable may include at least one fin device adjacent the anchor, the fin of the device being inclined such that burial forces are produced by the device to counteract the vertical penetration resistance of the adjacent cable and to constrain the buried portion of the cable to depart from theusual catenoidal configuration and adopt a linear or adverse curvature configuration.
  • the present invention relates to an anchor-cable for mooring an object to a mooring bed; for example, for mooring a vessel or other floating body, or a standing or floating drilling rig or the like to the sea bed.
  • cable as used hereinafter and in the claims includes wire hawser, chain cable and the like.
  • working vertical burial attitude as used hereinafter and in the claims, applied to a burying body, such as an anchor or a cable-depressing fin device, is meant the attitude of the body whereby, when dragged wholly immersed in a particulate mooring bed, the resultant force vector on the body due to interaction with the particulate bed lies substantially in a vertical plane and in a direction such as to tend to cause burial of the body.
  • reverse attitude to the working vertical burial attutide as used hereinafter and in the claims, applied to a burying body such as an anchor or a cable-depressing fin device, is meant the attitude the body would have if rotated 180 about its fore-and-aft axis from its working vertical burial attitude. 7
  • the anchor includes a shank part to which are attached flukes which can be inclines relative to the shank such that, with the anchor on a sea bed of soft material such as for example mud, sand or gravel and with the shank horizontal and connected by an elongate cable to an object to be moored, the flukes dig into the sea bed when the anchor is subjected to a horizontal pull from the cable and so causes burial of the anchor.
  • flukes which can be inclines relative to the shank such that, with the anchor on a sea bed of soft material such as for example mud, sand or gravel and with the shank horizontal and connected by an elongate cable to an object to be moored, the flukes dig into the sea bed when the anchor is subjected to a horizontal pull from the cable and so causes burial of the anchor.
  • the anchor be substantially buried to encourage the holding power of the overall system.
  • the buried portion of the cable gives rise to increasing uplifting forces being applied to the anchor and also tends to adapt an approximately catenoidal configuration, resulting in pivoting of the anchor as a whole, whereby the angle of attack of the flukes relative to the horizontal is decreased, and the downwards force acting on the flukes to bury the anchor and cable is consequently also decreased when required to overcome the increasing uplifting force due to the cable.
  • This change of attitude rapidly progresses until the angle of attack of the flukes is so reduced that an equilibrium state is established with the result that no further burial of the anchor and cable is possible.
  • the maximum angle of attack of the flukes to the horizontal in a working attitude is the greatest angle enclosed by the plane of the flukes and a straight line passing through the intersection of the pivot axis of the cable shackle pin with the extremity of the shank remote from the flukes and passing through the centroid of the flukes.
  • the angle of attack of the flukes may be designated a and the abovementioned straight line referred to as the tangent to the cable at the shackle pin or, for brevity, the tangent.
  • the forces developed by the anchor may be resolved into a vertically downward burying component, P a function of a f (a), and a horizontal drag component, D f (a) K, where K is the horizontal component of anchor drag when the anchor orientation is such that the cross-sectional area in the direction of movement is at a minimum.
  • the tangent to the cable at the shackle pin is horizontal.
  • the buried portion of the cable will tend to adopt a curve approximately catenoidal in form, due to distributed resistive forces acting along its length arising from movement through the resistive medium of the sea bed.
  • the portion of the cable directly adjacent to the shackle pin on the shank of the anchor and, consequently, the tangent thereat will be inclined therefore to the horizontal by some angle, B.
  • the resistive forces distributed along the buried portion of the cable may also be resolved vertically and horizontally and summed to give an upward lift component opposing the burialforce, P, of the anchor and a horizontal drag component opposing the pull applied to the anchor cable above the sea bed surface.
  • the horizontal drag components may be seen to act together to constitute the horizontal holding power of the anchor-cable system while the vertical uplifting and burial components oppose and are equal in the equilibrium state.
  • the angle of attack of the flukes decreases with the result that the rate of increase of burial force with increasing depth of burial is reduced to a rate less than the rate of increase of the upward lift component of force developed by the cable.
  • the increasing upward lift component of force ultimately overtakes and equals the burial component of force developed by the anchor and so vertical equilibrium of the anchor cable system is established. In this equilibrium condition, the anchor has reached the maximum depth of penetration allowed by the cable and moves horizontally only.
  • the horizontal holding force developed with the anchor just moving comprising anchor drag and cable drag, is now a constant and is generally quoted as the maximum holding power of the anchor although a substantial por- 'tion of the holding power of such an anchor-cable system is derived from the buried portion of the cable.
  • each cablemounted device is a surface of an inclined fin forming part of the device.
  • the center of area of the inclined fin is offset from the axis of the cable.
  • each finned device is pivotably mounted on the cable to permit the ofiset fins to trail behind the cable and so adopt automatically an efiective working orientation for the burial fins.
  • each cable-mounting device has two or more burial fins-inclined relative to each other as well as to the cable axis such that the device is symmetrical about a vertical plane bisecting it when in a working vertical burial attitude, and such that the fins are in an anhedral configuration.
  • each' device is such that, when interacting with, the mooring bed surface in a reverse attitude to the working vertical burial attitude, the resultant force vector produced by the portions of burial fin lying at either side of the vertical plane of symmetry bisecting the device, and making contact with the surface material. of the mooring bed, lies on a straight line intersecting the vertical plane of symmetry at a point below the axis of the portion of the cable trailing behindthe device.
  • a plurality of devices are mounted on the cable, the angles of inclination relative to the cable axis of the inclined surfaces of all of the devices being equal in magnitude to each other.
  • the angle of inclination of the inclined surface of the cable-mounting device to the axis of the cable may be at any angle whereby sufficient burial force is developed by the device on engaging the mooring bed in the working vertical burial attitude to bury the device and counteract the resistance of a portion of the adjacent cable to penetration into the mooring bed.
  • each finbearing device includes a forward clamping collar positionable on a wire hawser cable and having an annular recess on an end well'thereof, a sleeve on which are mounted a pair of offset opposed fins inclined relative to the axis of the collar and to each other and a third fin between the opposed fins and upstanding from the sleeve, the leading end of the sleeve being insertable into the recess of the forward collar while the trailing end of the sleeve is provided with a recess,-and a trailing clamping collar insertable into the recess of the sleeve to locate the sleeve rotatably in position on the wire hawser cable.
  • the device may then be deployed as an integral link in the chain cable.
  • the opposed fins may be inclined nose down at an angle to the axis of thesleeve in the range of 15 to-, and particularly 30 to 60.
  • the cable is constrained to depart fromthe usual catenoidal curve and take up a substantially linear configuration of fixed slope throughout its length buried below the sea bed surface.
  • the tangent at the shankshackle' pin will have the same slope as the cable and will be collinear with it.
  • the distributed spaced burial forces, due to the devices on the cable can be arranged to enforce a known fixed slope on the linearized buried cable so that the angle [3 is never large enough to reduce substantially the angle of attack of the terminal anchor from the maximum.
  • the anchor will thus continue to function effectively and produce a substantially constant burial force irrespective of the depth of penetration of the anchor and cable below the sea bed surface.
  • the finned devices mounted on the cable are each capable of producing a burial force equal to the lifting force developed by the portion of cable forming an interval between adjacent finned devices in addition to the burial force necessary to bury the finned device itself, so no increase of upward lifting force will be impressed on the terminal anchor due to increase of the buried length of the cable with increasing depth of burial of the anchor. Therefore, all the limitations to the depth of burial of an anchor and cable 7 mooring system will be eliminated or substantially mitigated if finned devices of the present invention are distributed by spacing along the cable.
  • the holding power of such an anchor and cable mooring system will depend only on the depth of anchor-penetrable soil beneath the sea bed surface provided that finned devices are mounted on a sufficient length of cable adjacent to the terminal anchor. Given an adequate depth of anchor-penetrable mooring bed, the holding power may be chosen to have a maximum as close to the breaking strength of the anchor cable as desired simply by mounting a sufficient number of finned devices on the cable to allow the terminal anchor to penetrate far enough under the sea bed surface.
  • FIG. 2 shows a modified form of the anchor of FIG.
  • FIG. 3 shows a cross-sectional view of the anchor body of the anchors of FIGS. 1 and 2 through the section A-A;
  • FIG. 4 shows a sectional side view of a fin device for a cable, according to a first embodiment of the present invention
  • FIG. 6 shows a front view of the fin device of FIG. 4 looking in the direction of arrow A in FIG. 4;
  • FIG. 7 shows an oblique top view of the fin device of FIG. 4
  • FIG. 8 shows a side view of a fin device according to a second embodiment of the second aspect of the present invention.
  • FIG. 9 shows schematically the use of a conventional anchor for mooring a ship; and the useof fin devices according to FIGS. 4 or 8 on a mooring cable.
  • an anchor 1 for mooring a vessel 2 (FIG. 9) to the sea bed 3 includes a deep elongate bar 4 of generally rectangular cross-section (see FIG. 3) but with the top and bottom edges 5, 6 chamfered to assist penetration of the bar 4 into the sea bed 3 in the manner of edgewise penetration of a knife blade.
  • a pair of opposed flukes 8 are pivotably mounted together on a pivots 9 on opposed side faces 10, 11 of the bar 4 so that they can pivot about an axis normal to the vertical side faces 10, 11 of the bar 4 and the bills 12 of the flukes 8 project forwardly.
  • the nose portion 7 of the bar 4 has sufficient length L forward of the'pivot axis 9 of the flukes 8 to prevent tipping of the anchor l on engaging the sea bed or in the event of the flukes 8 snagging on a rock or similar obstruction.
  • Stops 13 are provided on the top and bottom of the bar 4 (top one only being shown) to limit the pivoting of the flukes 8 to an angle of between to 40 on either side of the longitudinal axis of the bar 4; but a maximum pivoting angle of up to 55 is envisaged and could be substituted.
  • a shank 14 is pinned to the nose 7 and stops 15 are provided on the nose pan of the bar to limit the pivoting of the shank 14 to a maximum of 90.
  • a pair of opposed stocks 16, normal to the side walls 10, 11 of the bar 4 are attached to the flukes 8 and maintain the rotational stability of the anchor 1 about the axis of the bar 4 during penetration of the mooring bed surface 3.
  • tripping palms 8A are provided.
  • a pair of opposed stabilizer fins 18 are attached to the side faces 10, ll of the bar 4 and project normally therefrom, the plane of the fins 18 being parallel to the axis of the bar 4.
  • the purpose of these fins 18 is to counteract and so mitigate against pivoting of the anchor 1 about a horizontal axis transverse to the longitudinal axis of the bar 4 when the anchor is buried in the sea bed.
  • the function of the stocks 16 may be achieved, alternatively, as a secondary function of these stabilizer fins 18 by suitably increasing their span transverse to the longitudinal axis of the bar 4 and such an anchor is shown in FIG. 2 where the stocks 16 are dispensed with.
  • the flukes 8 which will have an angle of attack relative to the sea bed 3 equal to the angle of inclination a to the baraxis which may be up to will dig into the sea bed 3. With further horizontal movement-of the anchor 1, further burial of the anchor 1 below the surface of the sea bed 3 will take place. The angle of attack of the flukes 8 relative to the sea bed 3 will tend to change to conform with the definition of angle of attach mentioned earlier. However, the buried stabilizer fins 18 will control the angle of attack of the anchor l and maintain it close to the angle of inclination a of the flukes 8 with respect to the longitudinal axis of the anchor bar 4.
  • the buried portion 19A of the cable 19 will adopt an approximately catenoidal configuration. Consequently, the shank 14 will be inclined upwards at an angle [3 relative to the axis 4A of the bar 4, and the pull on the shank 14 will tend to pivot the bar 4 such that the angle of attack of the flukes with respect to the sea bed 3 is decreased.
  • the stabilizer fins 18 will counteract and mitigate against such pivoting of the bar 4; and the anchor flukes will therefore tend to maintain their angle of attack and so permit the anchor to continue to operate effectively.
  • a cable 20 for attachment to an anchor 21 as above described for mooring a ship to the sea bed has one or more spaced fin devices 22 adjacent to the anchor end thereof.
  • the spacing H of the fin devices 22 may be at some suitable interval such that the burial force generated by each device 22 can bury the device 22 and, in addition, counteract the vertical drag resistance of an interval of cable 20 between adjacent devices 22.
  • each fin device 22 includes a rotatable sleeve 23 (FIG.
  • a pair of ofiset opposed fins 26 project from the sleeve, are inclined relative to each other (see FIG. 7) and also are inclined relative to the axis of the sleeve 23 such that, with the cable 20 positioned horizontally at the sea bed 3, the
  • the leading collar .24 hasan end wall 27 with an annular recess 28 therein, and the leading end of the sleeve 23A is inserted into i this recess 28; and the other (trailing) end 23B of the sleeve 23 has a recess 29 into which the trailing collar is inserted to position the sleeve 23 on the cable 20.
  • a rearwardly projecting annular extension 30 of the leading collar 24 serves as a bearing for the sleeve 23.
  • a further fin 31 is provided between the opposed fins 26 and projects normally from the sleeve 23. This third fin 31 is located in a plane containing the axis of the sleeve 23.
  • each fin device 22 for use with chain cable, each fin device 22 includes a rotatable sleeve 40 which has its forward end 40A located and supported in a forward fairing 41 furnished with a chain ring 42 and the trailing end 40B of the sleeve 40 accommodates the leading end of a trailing fairing 43.
  • the fairing 41, 43 are linked with the chain and perform the function of a chain link.
  • a pair of offset opposed fins 44 project from the sleeve 40, corresponding to the fins 26 of the FIG. 4 arrange ment, and operate similarly.
  • the forward fairing 41 has an end wall 45 with an annular recess (not shown) therein, and the leading end 40A of the sleeve 40 is inserted into this recess and the other (trailing) end 408 of the sleeve 40 has a similar recess (not shown) into which a retaining collar may be fitted while encircling a rearwards projecting cylindrical projection of the forward fairing 41 which serves as a bearing for the sleeve.
  • the aft chain ring 42 of the forward fairing 41 is mounted at the rear of the rearwards projecting cylindrical projection of the forward fairing 41.
  • a further fin 46 is provided between the opposed fins 44 and projects normally from the sleeve while located in a plane containing the axis of the sleeve 40.
  • the cable system is intended for use particularly in a soft sea bed of the type hereinbefore described.
  • the length of cable 20 used is several times the depth of water at the mooring location so that the portion 20A of the cable adjacent the anchor 21 lies substantially horizontal along the sea bed.
  • the anchor 21 and the portion of the cable 20A adjacent thereto penetrate into the sea bed 3.
  • Penetration of the sea bed surface by the cable 20 under the action of the terminal anchor 21 causes the fin devices 22 to engage the sea bed with the result that burial forces are developed at the inclined fins 26, 44 of the fin devices 22.
  • the fin devices 22 will automatically establish the correct trailing aspect, on engaging the sea bed 3, owing to the separation of the center of area of the fins 26, 44 from the axis of the cable and the disposition of the fins as a group.
  • the angle of inclination of the anchor end of the cable to the horizontal, B is maintained smaller than would be the case if the cable were not fitted with the fin devices and consequently allowed to adopt the approximately catenoidal configuration hereinbefore discussed.
  • This small value of B is invariant with depth of burial of the cable and establishes a determinable reduction. of the angle of attack of any conventional anchor used as a terminal anchor such that-it can-continue to produce a useful burial force at the cable end.
  • the fins could be simply mounted on a pair of spaced collars on the wire cable and between a sleeve of the cable serving to locate the device. Again, a sufficient degree of freedom of movement (or play) would be arranged between the collarsand the cable/sleeve to prevent clogging by sand or the like. Also, it would, of course, be possible to dispense with the middle fin 31, 46.
  • the cable must be able to resist any tendency to increase its slope with depth of burial.
  • the cable must be capable of producing burying forces distributed along its length in order to continuously counteract the penetration resistance of the cable as it is drawn underground.
  • the cable system could be used with a conventional anchor.
  • An anchor cable including a cable for attachment at one end to an anchor for mooring an object to a mooring bed, one or more spaced finned burial devices adjacent to the anchor end of the cable and including means of attaching the device co-axially to the cable, at least one finned member on each device including a burial surface which in a working vertical burial attitude of the device is inclined relative to the cable axis and adapted to produce burial forces capable of burying the finned device and counteracting the vertical drag forces developed by the adjacent cable on penetration of the cable including the device into the mooring bed so that the buried portion of the cable is constrained to depart from an approximately catenoidal configuration and tend to adopt a substantially linear or reverse curvature configuration.
  • each finned device is pivotably mounted on the cable to permit the offset fins to trail behind the cable and so adopt automatically an effective working orientation for the fins.
  • each burial device has two or more fins inclined relative to each other as well as to the cable axis such that the device is symmetrical about a vertical plane bisecting it when in a working vertical burial attitude, and such that the fins are in an anhedral configuration.
  • a finned burial device for use with an anchorcable for mooring an object to a mooring bed, including means for attachment of the device to an anchor cable so that the longitudinal axis of the device is coaxial with the cable and at least one finned member including a burial surface which in a working vertical burial attitude of the device is inclined relative to the Iongitudinal axis of the device and adapted to produce burial forces capable of burying the finned device and counteracting the vertical drag forces developed by the adjacent cable on penetration of the device into the mooring bed.
  • each burial device has two or more fins inclined relative to each other as well as to the cable axis such that the device is symmetrical about a vertical plane bisecting it when in a working vertical burial attitude, and such that the fins are in an anhedral configuration.
  • an anchor cable attached at oneend to the anchor, one or more spaced finned burialidevices adjacent to the anchor end of the cable, and including means for attaching the device co-axially to the cable, at least one finned member on each device including a burial surface which in a working vertical burial attitude of the device is inclined relative to the cable axis and adapted to produce burial forces capable of burying the finned device and counteracting the vertical dragforces developed by the adjacent cable on penetration of the cable including the device into the mooring bed so that the buried portion of the cable is constrained to depart from an'approximately catenoidal configuration and tend to adopt a substantially linear or reverse curvature configuration.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Laying Of Electric Cables Or Lines Outside (AREA)
US886539A 1968-12-24 1969-12-19 Anchor-cable systems Expired - Lifetime US3685479A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB5479769A GB1299366A (en) 1968-12-24 1968-12-24 Improvements in or relating to anchor-cable systems
GB6149868 1968-12-24

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US3685479A true US3685479A (en) 1972-08-22

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US886539A Expired - Lifetime US3685479A (en) 1968-12-24 1969-12-19 Anchor-cable systems

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US (1) US3685479A (nl)
JP (1) JPS4925713B1 (nl)
CA (1) CA923379A (nl)
ES (1) ES374918A1 (nl)
HK (1) HK49376A (nl)
NL (1) NL164816C (nl)
NO (1) NO129894B (nl)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4145987A (en) * 1976-09-20 1979-03-27 Single Buoy Moorings Inc. Flare buoy
US4346663A (en) * 1978-05-02 1982-08-31 Institut Francais Du Petrole Anchoring system
US4397255A (en) * 1981-06-15 1983-08-09 The United States Of America As Represented By The Secretary Of The Navy Anchor holding capacity augmentation system
US4831952A (en) * 1986-10-24 1989-05-23 Dumison Marine Pty. Ltd. Anchor
WO1992020569A1 (en) * 1991-05-21 1992-11-26 Brupat Limited Improved marine anchor
WO1993011028A1 (en) * 1991-11-27 1993-06-10 Brupat Limited Drag embedment marine anchor
WO1996033907A1 (en) * 1995-04-26 1996-10-31 Brupat Limited Mooring bed assessment apparatus and method
WO1996039324A1 (en) * 1995-07-21 1996-12-12 Brupat Limited Anchoring apparatus and method
US20050002740A1 (en) * 2001-10-24 2005-01-06 Stephane Andres Guide device in an offshore drilling installation
US20050152749A1 (en) * 2002-06-19 2005-07-14 Stephane Anres Telescopic guide pipe for offshore drilling
WO2015166207A1 (en) * 2014-05-01 2015-11-05 Brupat Limited Fluked burying devices

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2414480A (en) * 1945-02-07 1947-01-21 Morrill Ferdinand Gordon Underwater kite
US3134355A (en) * 1962-09-14 1964-05-26 Jakosky John Jay Sea anchor
US3434451A (en) * 1967-06-28 1969-03-25 Braincon Corp Method and apparatus for underwater towing of seismic hydrophone arrays

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2414480A (en) * 1945-02-07 1947-01-21 Morrill Ferdinand Gordon Underwater kite
US3134355A (en) * 1962-09-14 1964-05-26 Jakosky John Jay Sea anchor
US3434451A (en) * 1967-06-28 1969-03-25 Braincon Corp Method and apparatus for underwater towing of seismic hydrophone arrays

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4145987A (en) * 1976-09-20 1979-03-27 Single Buoy Moorings Inc. Flare buoy
US4346663A (en) * 1978-05-02 1982-08-31 Institut Francais Du Petrole Anchoring system
US4397255A (en) * 1981-06-15 1983-08-09 The United States Of America As Represented By The Secretary Of The Navy Anchor holding capacity augmentation system
US4831952A (en) * 1986-10-24 1989-05-23 Dumison Marine Pty. Ltd. Anchor
US5511506A (en) * 1991-05-21 1996-04-30 Brupat Limited Marine anchor
WO1992020569A1 (en) * 1991-05-21 1992-11-26 Brupat Limited Improved marine anchor
GB2271972A (en) * 1991-05-21 1994-05-04 Brupat Ltd Improved marine anchor
GB2271972B (en) * 1991-05-21 1995-09-27 Brupat Ltd Improved marine anchor
AU663317B2 (en) * 1991-05-21 1995-10-05 Brupat Limited Marine anchor
WO1993011028A1 (en) * 1991-11-27 1993-06-10 Brupat Limited Drag embedment marine anchor
US5474015A (en) * 1991-11-27 1995-12-12 Brupat Limited Drag embedment marine anchor
US5970901A (en) * 1995-04-26 1999-10-26 Brupat Limited Mooring bed assessment apparatus and method
AU703249B2 (en) * 1995-04-26 1999-03-25 Brupat Limited Mooring bed assessment apparatus and method
WO1996033907A1 (en) * 1995-04-26 1996-10-31 Brupat Limited Mooring bed assessment apparatus and method
CN1069279C (zh) * 1995-04-26 2001-08-08 布鲁帕特有限公司 锚泊床的评估装置与方法
WO1996039324A1 (en) * 1995-07-21 1996-12-12 Brupat Limited Anchoring apparatus and method
US5890451A (en) * 1995-07-21 1999-04-06 Brupat Limited Anchoring apparatus and method
AU705342B2 (en) * 1995-07-21 1999-05-20 Brupat Limited Anchoring apparatus and method
US20050002740A1 (en) * 2001-10-24 2005-01-06 Stephane Andres Guide device in an offshore drilling installation
US7048470B2 (en) 2001-10-24 2006-05-23 Saipem S.A. Guide device in an offshore drilling installation
US20050152749A1 (en) * 2002-06-19 2005-07-14 Stephane Anres Telescopic guide pipe for offshore drilling
WO2015166207A1 (en) * 2014-05-01 2015-11-05 Brupat Limited Fluked burying devices
JP2017514754A (ja) * 2014-05-01 2017-06-08 ブルパット リミテッド 錨爪式埋設デバイス

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ES374918A1 (es) 1972-05-16
HK49376A (en) 1976-08-06
NL6919447A (nl) 1970-06-26
JPS4925713B1 (nl) 1974-07-02
NL164816B (nl) 1980-09-15
CA923379A (en) 1973-03-27
NL164816C (nl) 1981-02-16
NO129894B (nl) 1974-06-10

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