GB1570606A - Anchor marking and recovery apparatus - Google Patents

Anchor marking and recovery apparatus Download PDF

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Publication number
GB1570606A
GB1570606A GB1314276A GB1314276A GB1570606A GB 1570606 A GB1570606 A GB 1570606A GB 1314276 A GB1314276 A GB 1314276A GB 1314276 A GB1314276 A GB 1314276A GB 1570606 A GB1570606 A GB 1570606A
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GB
United Kingdom
Prior art keywords
shackle
mooring line
swivel
anchor
line
Prior art date
Legal status (The legal status 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 status listed.)
Expired
Application number
GB1314276A
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ABERGLEN HOLDINGS Ltd
Original Assignee
ABERGLEN HOLDINGS Ltd
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 ABERGLEN HOLDINGS Ltd filed Critical ABERGLEN HOLDINGS Ltd
Priority to GB1314276A priority Critical patent/GB1570606A/en
Publication of GB1570606A publication Critical patent/GB1570606A/en
Expired legal-status Critical Current

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Classifications

    • 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
    • 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
    • B63B21/22—Handling or lashing of anchors

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Farming Of Fish And Shellfish (AREA)

Description

(54) AN ANCHOR MARKING AND RECOVERY APPARATUS (71) We, ABERGLEN HOLDINGS LIMI TED, a British Company, of Abergien House, Greenbank Road, East Tullos Industrial Estate, Aberdeen AB1 4BS, Grampian, Scotland, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to an anchor marking and recovery apparatus and in particular to the use of a spar buoy in such an apparatus. Throughout this specification reference will be made to "positive" and "negative" buoyancies and it should be appreciated that these terms refer to the body of water in which the system is designed to be used.
In most cases the buoyancies will be so different from neutral buoyancy in the two cases that they will be "positive" or "negative" irrespective of the salinity or temperature of the water in which they will be used, but this is not necessarily the case.
According to the invention an anchor marking an recovery apparatus comprises a spar buoy, a sinker for resting on ground at the bottom of a body of water and provided with attachment means enabling connection thereto of an anchor recovery line, a mooring line comprising a comparatively short portion of negative buoyancy connected directly to the sinker, and a comparatively long portion of positive buoyancy connecting the said short portion to the spar buoy, and a sub-surface float connected to the mooring line for ensuring that the lower end of the mooring line is raised clear of the ground at the bottom of the body of water.
The said long portion of the mooring line may comprise polypropylene rope and the said short portion of the mooring line may comprise a metal chain. The sub-surface float is suitably connected to either said long portion or to the interconnection between said short and long portions.
A counterweight may be attached to the bottom of the spar buoy, in which case the upper end of the mooring line is connected to the counterweight.
A light may be provided in the spar buoy.
The invention will now be described by way of example, and with particular ref- erence to, the drawings accompanying the Provisional Specification, in which: Figure 1 is a schematic view of one embodiment of an anchor marking and recovery apparatus according to the invention and Figure 2 is a schematic view of another embodiment of an anchor marking and recovery apparatus according to the invention.
Figure 1 shows a spar buoy, generally designated by the reference numeral 1, floating in a body of water 2, a sinker 3 resting on the ground 4 at the bottom of the body of water 2, a mooring line, generally designated by the reference numeral 5, connected between the spar buoy and the sinker, an anchor 6 of a marine structure (not shown but which may typically be a ship, rig, barge or recovery vessel), and an anchor recovery line 7 connected between the sinker 3 and the anchor 6.
The spar buoy 1 comprises an upper portion 8 which projects above the surface 9 of the body of water 2 and a lower portion 10 positioned beneath the surface 9. In order to make the spar buoy 1 more easily identifiable from a distance, the upper portion 8 may be marked in a distinctive manner or may be provided with a light (not shown but typically in the form of a flashing light).
A counterweight 11 is suspended from the lower portion 10, via the intermediary of a shackle 12, to give the spar buoy 1 stability in the vertical plane. A counterweight is preferred to a conventional metal chain which tends to "thrash" in the water possibly fouling the propellor of an anchor recovery vessel.
The mooring line 5 comprises an upper portion 13 of polypropylene rope, an intermediate portion 14 of polypropylene rope, and a lower portion 15 of metallic chain.
The upper end of the portion 13 is provided with a thimble 16 which is connected via a shackle 17 to the counterweight 11. A connection permitting relative rotation between the upper and intermediate portions 13 and 14 is provided by a swivel 19, the lower end of the portion 13 being connected to the swivel 19 by a thimble 18 and a shackle 20, and the upper end of the portion being connected to the swivel 19 by a thimble 21 and a shackle 22. In a similar manner relative rotation between the intermediate and lower portions 14 and 15 is provided by a swivel 23, the lower end of the portion 14 being connected to the swivel 23 by a thimble 24 and a shackle 25, and the upper end of the portion 15 being connected to the swivel 23 by a shackle 26. The lower end of the portion 15 is connected to the sinker 3 via a shackle 27.
In practice, the length of the mooring line 5 is determined by the depth of the body of water 2 and is typically chosen to be the depth of the body of water (typically 150 metres) +25 metres. The majority of the length of the mooring line is made of positively buoyant material (e.g. the polypropylene rope of the portions 13 and 14) and only the lower portion 15, typically only about 3 metres in length, is made of negatively buoyant material (e.g. 1.5 inch diameter metal chain) which is more resistant to chafing, caused by movement on the ground 4, than the positively buoyant material.
A sub-surface float 28 is connected to the shackle 20 via a line 29 and assists in lifting the negatively buoyant lower portion 15 off the ground 4. It is preferred that only a single float 28 is shackled to the mooring line 5 so that there is no problem of the lines of two or more floats entangling with one another. It is, of course, essential for the lower portion 15 to be raised clear of the ground 4 to prevent or reduce chafing of the positively buoyant portion 14 on the ground 4.
The anchor recovery line 7 is connected to the sinker 3 via a shackle 30. The length of the line 7 should be greater than the depth of the body of water 2 since it is intended to be connected to a winch (not shown) on board an anchor recovery vessel or the marine structure for recovering the anchor 6. The weight of the sinker 3 ensures that the line 7 is not lifted off the ground 4 by the buoyancy of the mooring line 5, the float 28 and the spar buoy 1.
In the anchor marking and recovery appa ratus shown in Figure 1, the spar buoy 1 has a weight of 350 kilograms, the counterweight 11 has a weight of 140 kilogrammes, the 8uSsurface float has a weight of 50 kilo 8-mes. and the sinker has a weight of 250 ines. The upper portion 13 of the m ine 5 has a diameter of 32 mm and a breaking strain of 12.8 tonnes and the intermediate portion 14 of the mooring line 5 has a diameter of 44 mm and a breaking strain of 23.4 tonnes. Suitably the safe working load of the shackles 12, 17, 20 and 22 is 4.75 tonnes, of the shackle 27 is 13.5 tonnes, of the shackles 25 and 26 is 8.5 tonnes, of the swivel 19 is 5.0 tonnes and of the swivel 23 is 8.1 tonnes.
Figure 2 shows an anchor marking and recovery apparatus which is a modification of that shown in Figure 1. Where appropriate, similar reference numerals have been used in Figures 1 and 2 to indicate corresponding parts of the two anchor marking and recovery apparatuses.
The main difference between the two apparatuses is that the upper and intermediate portions 13 and 14 of the system shown in Figure 1 have been replaced in the system shown in Figure 2, by an upper portion 40 consisting of a single length of positive buoyancy rope (e.g. 44 mm diameter polypropylene rope having a breaking strain of 23.4 tonnes). The upper portion 40 of the mooring line 5 has a thimble 41 at its upper end connected to a swivel 42 via a shackle 43, the swivel being connected to the shackle 17, and a thimble 44 at its lower end connected to the shackle 25. The sub-surface float 28 is connected via its line 29 to the shackle 25.
WHAT WE CLAIM IS: 1. An anchor marking and recovery apparatus comprising a spar buoy, a sinker for resting on ground at the bottom of a body of water and provided with attachment means enabling connection thereto of an anchor recovery line, a mooring line comprising a comparatively short portion of negative buoyancy connected directly to the sinker, and a comparatively long portion of positive buoyancy conecting the said short portion to the spar buoy, and a sub-surface float connected to the mooring line for ensuring that the lower end of the mooring line is raised clear of the ground at the bottom of the body of water.
2. An apparatus according to claim 1, in which the said long portion of the mooring line comprises polypropylene rope.
3. An apparatus according to claim 1 or 2, in which the said short portion of the mooring line comprises a metal chain.
4. An apparatus according to any of the preceding claims, in which the sub-surface float is connected to the said long portion of the mooring line.
5. An apparatus according to any of claims 1 to 3, in which the sub-surface float is connected to the intrconnection between the said short and long portions of the mooring line.
6. An apparatus according to any of the
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (8)

  1. **WARNING** start of CLMS field may overlap end of DESC **.
    with a thimble 16 which is connected via a shackle 17 to the counterweight 11. A connection permitting relative rotation between the upper and intermediate portions
    13 and 14 is provided by a swivel 19, the lower end of the portion 13 being connected to the swivel 19 by a thimble 18 and a shackle 20, and the upper end of the portion being connected to the swivel 19 by a thimble 21 and a shackle 22. In a similar manner relative rotation between the intermediate and lower portions 14 and 15 is provided by a swivel 23, the lower end of the portion
    14 being connected to the swivel 23 by a thimble 24 and a shackle 25, and the upper end of the portion 15 being connected to the swivel 23 by a shackle 26. The lower end of the portion 15 is connected to the sinker 3 via a shackle 27.
    In practice, the length of the mooring line 5 is determined by the depth of the body of water 2 and is typically chosen to be the depth of the body of water (typically 150 metres) +25 metres. The majority of the length of the mooring line is made of positively buoyant material (e.g. the polypropylene rope of the portions 13 and 14) and only the lower portion 15, typically only about 3 metres in length, is made of negatively buoyant material (e.g. 1.5 inch diameter metal chain) which is more resistant to chafing, caused by movement on the ground 4, than the positively buoyant material.
    A sub-surface float 28 is connected to the shackle 20 via a line 29 and assists in lifting the negatively buoyant lower portion 15 off the ground 4. It is preferred that only a single float 28 is shackled to the mooring line 5 so that there is no problem of the lines of two or more floats entangling with one another. It is, of course, essential for the lower portion 15 to be raised clear of the ground 4 to prevent or reduce chafing of the positively buoyant portion 14 on the ground 4.
    The anchor recovery line 7 is connected to the sinker 3 via a shackle 30. The length of the line 7 should be greater than the depth of the body of water 2 since it is intended to be connected to a winch (not shown) on board an anchor recovery vessel or the marine structure for recovering the anchor 6. The weight of the sinker 3 ensures that the line 7 is not lifted off the ground 4 by the buoyancy of the mooring line 5, the float
    28 and the spar buoy 1.
    In the anchor marking and recovery appa ratus shown in Figure 1, the spar buoy 1 has a weight of 350 kilograms, the counterweight
    11 has a weight of 140 kilogrammes, the 8uSsurface float has a weight of 50 kilo 8-mes. and the sinker has a weight of 250 ines. The upper portion 13 of the m ine 5 has a diameter of 32 mm and a breaking strain of 12.8 tonnes and the intermediate portion 14 of the mooring line 5 has a diameter of 44 mm and a breaking strain of 23.4 tonnes. Suitably the safe working load of the shackles 12, 17, 20 and 22 is 4.75 tonnes, of the shackle 27 is 13.5 tonnes, of the shackles 25 and 26 is 8.5 tonnes, of the swivel 19 is 5.0 tonnes and of the swivel 23 is 8.1 tonnes.
    Figure 2 shows an anchor marking and recovery apparatus which is a modification of that shown in Figure 1. Where appropriate, similar reference numerals have been used in Figures 1 and 2 to indicate corresponding parts of the two anchor marking and recovery apparatuses.
    The main difference between the two apparatuses is that the upper and intermediate portions 13 and 14 of the system shown in Figure 1 have been replaced in the system shown in Figure 2, by an upper portion 40 consisting of a single length of positive buoyancy rope (e.g. 44 mm diameter polypropylene rope having a breaking strain of 23.4 tonnes). The upper portion 40 of the mooring line 5 has a thimble 41 at its upper end connected to a swivel 42 via a shackle 43, the swivel being connected to the shackle 17, and a thimble 44 at its lower end connected to the shackle 25. The sub-surface float 28 is connected via its line 29 to the shackle 25.
    WHAT WE CLAIM IS: 1. An anchor marking and recovery apparatus comprising a spar buoy, a sinker for resting on ground at the bottom of a body of water and provided with attachment means enabling connection thereto of an anchor recovery line, a mooring line comprising a comparatively short portion of negative buoyancy connected directly to the sinker, and a comparatively long portion of positive buoyancy conecting the said short portion to the spar buoy, and a sub-surface float connected to the mooring line for ensuring that the lower end of the mooring line is raised clear of the ground at the bottom of the body of water.
  2. 2. An apparatus according to claim 1, in which the said long portion of the mooring line comprises polypropylene rope.
  3. 3. An apparatus according to claim 1 or 2, in which the said short portion of the mooring line comprises a metal chain.
  4. 4. An apparatus according to any of the preceding claims, in which the sub-surface float is connected to the said long portion of the mooring line.
  5. 5. An apparatus according to any of claims 1 to 3, in which the sub-surface float is connected to the intrconnection between the said short and long portions of the mooring line.
  6. 6. An apparatus according to any of the
    preceding claims, in which a counterweight is attached to the bottom of the spar buoy.
  7. 7. An apparatus according to claim 6, in which the said long portion of the mooring line is connected to the counterweight.
  8. 8. An anchor marking and recovery apparatus constructed and arranged substantially as herein described with reference to, and as illustrated in, Figures 1 or 2 of the drawings accompanying the Provisional Specification.
GB1314276A 1977-03-31 1977-03-31 Anchor marking and recovery apparatus Expired GB1570606A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1314276A GB1570606A (en) 1977-03-31 1977-03-31 Anchor marking and recovery apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1314276A GB1570606A (en) 1977-03-31 1977-03-31 Anchor marking and recovery apparatus

Publications (1)

Publication Number Publication Date
GB1570606A true GB1570606A (en) 1980-07-02

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GB1314276A Expired GB1570606A (en) 1977-03-31 1977-03-31 Anchor marking and recovery apparatus

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132963A (en) * 1982-12-31 1984-07-18 Blohm Voss Ag An anchor string for floating structures in deep waters
GB2178128A (en) * 1985-07-19 1987-02-04 Ferranti Subsea Systems Deployment of flexible elongate members
WO1994007741A1 (en) * 1992-10-02 1994-04-14 Watt, Mark, William, Forbes An off-shore mooring and method of installing same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2132963A (en) * 1982-12-31 1984-07-18 Blohm Voss Ag An anchor string for floating structures in deep waters
GB2178128A (en) * 1985-07-19 1987-02-04 Ferranti Subsea Systems Deployment of flexible elongate members
WO1994007741A1 (en) * 1992-10-02 1994-04-14 Watt, Mark, William, Forbes An off-shore mooring and method of installing same
GB2286169A (en) * 1992-10-02 1995-08-09 Watt Mark William Forbes An off-shore mooring and method of installing same
GB2286169B (en) * 1992-10-02 1996-09-25 Watt Mark William Forbes An off-shore mooring and method of installing same

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CSNS Application of which complete specification have been accepted and published, but patent is not sealed