EP3259180B1 - Tugboat provided with a carrousel-type towing system - Google Patents

Tugboat provided with a carrousel-type towing system Download PDF

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Publication number
EP3259180B1
EP3259180B1 EP16716918.4A EP16716918A EP3259180B1 EP 3259180 B1 EP3259180 B1 EP 3259180B1 EP 16716918 A EP16716918 A EP 16716918A EP 3259180 B1 EP3259180 B1 EP 3259180B1
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EP
European Patent Office
Prior art keywords
tugboat
propulsion units
longitudinal direction
centre point
vertical distance
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.)
Active
Application number
EP16716918.4A
Other languages
German (de)
French (fr)
Other versions
EP3259180A1 (en
Inventor
Cornelis Levinus MULLER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Nova Patent BV
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Nova Patent BV
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
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Priority to PL16716918T priority Critical patent/PL3259180T3/en
Publication of EP3259180A1 publication Critical patent/EP3259180A1/en
Application granted granted Critical
Publication of EP3259180B1 publication Critical patent/EP3259180B1/en
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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 
    • B63B35/00—Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/66—Tugs
    • B63B35/68—Tugs for towing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/08—Arrangements on vessels of propulsion elements directly acting on water of propellers of more than one propeller
    • B63H5/10—Arrangements on vessels of propulsion elements directly acting on water of propellers of more than one propeller of coaxial type, e.g. of counter-rotative type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/125—Arrangements on vessels of propulsion elements directly acting on water of propellers movably mounted with respect to hull, e.g. adjustable in direction, e.g. podded azimuthing thrusters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63H—MARINE PROPULSION OR STEERING
    • B63H5/00—Arrangements on vessels of propulsion elements directly acting on water
    • B63H5/07—Arrangements on vessels of propulsion elements directly acting on water of propellers
    • B63H5/16—Arrangements on vessels of propulsion elements directly acting on water of propellers characterised by being mounted in recesses; with stationary water-guiding elements; Means to prevent fouling of the propeller, e.g. guards, cages or screens

Definitions

  • the present invention relates to a tugboat, comprising a single hull, a deck and a towing system having a circular or oval base connected to the deck, the base having a centre point, and a cart that is moveable over the base over 360°, wherein the cart comprises a powered winch during use provided with a tug cable for towing vessels, wherein a propulsion system is connected to the hull for providing a propulsive force in a body of water.
  • a towing system is also known as a carrousel-type towing system.
  • Such a tugboat is known from for instance WO 2006/049483 A1 by the present applicant.
  • a similar tugboat is disclosed in US 2006/112870 A1 .
  • a disadvantage of the known carrousel-type tugboat is that the propulsion forces are not positioned in the most optimal way to control the tugboat's heading during towing.
  • Another disadvantage is that a lot of engine thrust is needed to control the tugboat's heading.
  • the tugboat according to the invention is defined by the features of claim 1. Further more an operation method is disclosed in claim 8.
  • the vertical distance between the centre point and the waterline (H cp ) can for instance be 1,5 - 4,5 m.
  • the vertical distance between the centre of thrust of the propulsion units and the waterline (H p ) can for example be 3 - 5 m.
  • VSP's Voith Schneider Propellers
  • propulsion units comprise one or more azimuth thrusters.
  • thrusters can also be advantageously used to generate sideways forces.
  • the invention also relates to a method of operating a tugboat according to any one of the preceding claims, comprising the steps of:
  • Such a method advantageously employs the hydrodynamic resistance force created by the submerged hull to increase the tension of the tug cable, without needing a lot of thrust from the propulsion units to achieve this.
  • the orientation of the tugboat is corrected with the propulsion units in such a way, that the tug cable remains at an angle of 45 - 90° to the longitudinal direction of the tugboat, such that the hydrodynamic resistance of the hull (both for withstanding moments as well as withstanding movement due to the tension in the tug cable) stays relatively high.
  • the orientation of the tugboat is corrected with the propulsion units in such a way, that the tug cable remains at an angle of about 90° to the longitudinal direction of the tugboat. In this way, the hydrodynamic resistance of the hull in sideways direction remains as high as reasonably possible.
  • Figures 1-3 will be discussed in conjunction.
  • Figure 1 shows a tugboat 1, comprising a single hull 2, a deck 3 and a towing system 4 having a circular or oval base 5 connected to the deck 3.
  • the base 5 has a centre point CP.
  • a cart 6 is moveable over the base 5 over 360°, wherein the cart 6 comprises a powered winch 7 during use provided with a tug cable 8 for towing vessels 9.
  • a propulsion system 10 is connected to the lower side of the hull 2 for providing a propulsive force P in a body of water 11.
  • the propulsion system 10 comprises two propulsion units 12 each capable of providing a thrust or propulsive force P over 360° in a plane perpendicular to a vertical plane of symmetry 13 that extends in a longitudinal direction X of the tugboat 1 (see figures 2 and 3 ).
  • the maximum hull width W max can for instance be 8 - 14 m.
  • the maximum hull height H max can be, for instance, 2,5 - 7 m.
  • the propulsion units 12 are positioned in the vertical plane of symmetry 13 and are aligned in the longitudinal direction X.
  • One of the propulsion units 12 is positioned in front of the centre point CP and the other one is positioned behind the centre point CP and the distance between the propulsion units 12 is at least 10% of a length L of the tugboat 1 in the longitudinal direction X.
  • the tugboat 1 is configured in such a way that during towing the vertical distance between the centre point and the waterline H cp divided by the vertical distance between the centre of thrust of the propulsion units and the waterline H p is 0,3 - 1,5.
  • the ratio is 0,6 - 1,1, even more preferably around 0,95.
  • the change of hull 2 draft H draft and thus of the stated distances H cp and H p may be achieved by adapting the design or weight of the tugboat 1 or by using ballast tanks or the like.
  • the vertical distance between the centre point CP and the waterline H cp can for instance be 1,5 - 4,5 m.
  • the vertical distance between the centre of thrust of the propulsion units and the waterline H p can for example be 3 - 5 m.
  • the tugboat 1 may have propulsion units 12 in the form of Voith Schneider Propellers.
  • the tugboat 1 as shown has propulsion units 12 comprising a pair of azimuth thrusters.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
  • Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
  • Vehicle Body Suspensions (AREA)
  • Handcart (AREA)
  • Bridges Or Land Bridges (AREA)
  • Selective Calling Equipment (AREA)

Description

    Field of the invention
  • The present invention relates to a tugboat, comprising a single hull, a deck and a towing system having a circular or oval base connected to the deck, the base having a centre point, and a cart that is moveable over the base over 360°, wherein the cart comprises a powered winch during use provided with a tug cable for towing vessels, wherein a propulsion system is connected to the hull for providing a propulsive force in a body of water. Such a towing system is also known as a carrousel-type towing system.
    • Background of the invention
  • Such a tugboat is known from for instance WO 2006/049483 A1 by the present applicant. A similar tugboat is disclosed in US 2006/112870 A1 .
  • A disadvantage of the known carrousel-type tugboat is that the propulsion forces are not positioned in the most optimal way to control the tugboat's heading during towing.
  • Another disadvantage is that a lot of engine thrust is needed to control the tugboat's heading.
  • It is therefore an object of the present invention to provide a tugboat with a carrousel-type towing system that allows the most optimal control of the tugboat and to utilize the power of the carrousel-type tugboat to its full extent.
  • It is a further object of the invention to provide a tugboat having a carrousel-type towing construction, wherein the amount of engine thrust needed to generate the desired amount of towing force is decreased.
    • Summary of the invention
  • Hereto, the tugboat according to the invention is defined by the features of claim 1. Further more an operation method is disclosed in claim 8.
  • These combined features, and in particular the described values, allow the power of the carrousel-type tug system to be fully utilized and less engine thrust is needed to generate sufficiently large towing forces. The resistance of the hull itself can be advantageously used to create a counterforce opposed to the pulling force of the tug cable and thus tension in the tug cable can be increased to huge values without needing a lot of engine thrust. This is particularly relevant when pulling in a direction perpendicular to the longitudinal direction of the tugboat. The applicant has found that the stated values for Hp provide optimal stability to the tugboat. For values larger than 1,5 applicant has found that the tugboat gets elevated too much above the waterline, causing the positive effect on stability to be almost fully negated. The vertical distance between the centre point and the waterline (Hcp) can for instance be 1,5 - 4,5 m. The vertical distance between the centre of thrust of the propulsion units and the waterline (Hp) can for example be 3 - 5 m.
  • Having one of the propulsion units positioned in front of the centre point and the other one positioned behind the centre point, wherein the distance between the propulsion units is at least 10%, preferably at least 20% or more preferably at least 30%, of a length (L) of the vessel in the longitudinal direction, allows for correction of moments acting around a vertical axis of the vessel with only minimal amounts of engine thrust.
  • During tests, the applicant has achieved the following surprisingly positive results with the configuration according to the invention:
    • At a speed of 10 knots, with only 2825 kW of propulsive power installed, a steering force of 161t has been achieved;
    • At a speed of 10 knots, with only 2014 kW of propulsive power installed, a bracking force of 144t has been achieved; and
    • At a speed of 10 knots, with only 1045 kW of propulsive power installed, a braking force of 136t combined with a steering force of 75t has been achieved;
  • The multiplication factor of dynamic forces (at speed 10 knots; 161 t) relative to static force (static pull and function of used power; 2825 kW = 40 t static pull) is approximately 4, which is unheard of.
  • This means that a smaller hull can be used, but the tugboat is still able to generate the high dynamic forces that are required during escort assistance.
  • Another embodiment relates to an aforementioned tugboat, wherein the propulsion units comprise one or more Voith Schneider Propellers (VSP's). Such VSP's are particularly useful for generating sideways forces, especially when towing at large towing angles.
  • Another embodiment relates to an aforementioned tugboat, wherein the propulsion units comprise one or more azimuth thrusters. Such thrusters can also be advantageously used to generate sideways forces.
  • The invention also relates to a method of operating a tugboat according to any one of the preceding claims, comprising the steps of:
    • configuring the tugboat to attain such a draft during towing that the vertical distance between the centre point and the waterline (Hcp) divided by the vertical distance between the centre of thrust of the propulsion units and the waterline (Hp) is 0,3 - 1,5.
    • connecting the tug cable to a vessel to be towed and maneuvering the tugboat in such a way that the tug cable extends at an angle of 45 - 90° to the longitudinal direction of the vessel,
    • operating the powered winch such that the tug cable is under tension, wherein a hydrodynamic resistance force created by the submerged hull is used to increase the tension of the tug cable,
    • using the propulsion units to correct the orientation of the tugboat with respect to the vessel to be towed.
  • Such a method advantageously employs the hydrodynamic resistance force created by the submerged hull to increase the tension of the tug cable, without needing a lot of thrust from the propulsion units to achieve this.
  • Preferably, the orientation of the tugboat is corrected with the propulsion units in such a way, that the tug cable remains at an angle of 45 - 90° to the longitudinal direction of the tugboat, such that the hydrodynamic resistance of the hull (both for withstanding moments as well as withstanding movement due to the tension in the tug cable) stays relatively high.
  • More preferably, the orientation of the tugboat is corrected with the propulsion units in such a way, that the tug cable remains at an angle of about 90° to the longitudinal direction of the tugboat. In this way, the hydrodynamic resistance of the hull in sideways direction remains as high as reasonably possible.
    • Brief description of the drawings
  • An embodiment of a tugboat according to the invention will by way of nonlimiting example be described in detail with reference to the accompanying drawings. In the drawings:
    • Figure 1 shows a side view of a tugboat according to the invention;
    • Figure 2 shows a front view of the tugboat according to figure 1; and
    • Figure 3 shows a top view of the tugboat according to figures 1 and 2.
    Detailed description of the invention
  • Figures 1-3 will be discussed in conjunction. Figure 1 shows a tugboat 1, comprising a single hull 2, a deck 3 and a towing system 4 having a circular or oval base 5 connected to the deck 3. The base 5 has a centre point CP. A cart 6 is moveable over the base 5 over 360°, wherein the cart 6 comprises a powered winch 7 during use provided with a tug cable 8 for towing vessels 9. A propulsion system 10 is connected to the lower side of the hull 2 for providing a propulsive force P in a body of water 11. According to the invention, the propulsion system 10 comprises two propulsion units 12 each capable of providing a thrust or propulsive force P over 360° in a plane perpendicular to a vertical plane of symmetry 13 that extends in a longitudinal direction X of the tugboat 1 (see figures 2 and 3). The maximum hull width Wmax can for instance be 8 - 14 m. The maximum hull height Hmax can be, for instance, 2,5 - 7 m.
  • The propulsion units 12 are positioned in the vertical plane of symmetry 13 and are aligned in the longitudinal direction X. One of the propulsion units 12 is positioned in front of the centre point CP and the other one is positioned behind the centre point CP and the distance between the propulsion units 12 is at least 10% of a length L of the tugboat 1 in the longitudinal direction X. The tugboat 1 is configured in such a way that during towing the vertical distance between the centre point and the waterline Hcp divided by the vertical distance between the centre of thrust of the propulsion units and the waterline Hp is 0,3 - 1,5. Preferably the ratio is 0,6 - 1,1, even more preferably around 0,95. The change of hull 2 draft Hdraft and thus of the stated distances Hcp and Hp may be achieved by adapting the design or weight of the tugboat 1 or by using ballast tanks or the like.
  • The vertical distance between the centre point CP and the waterline Hcp can for instance be 1,5 - 4,5 m. The vertical distance between the centre of thrust of the propulsion units and the waterline Hp can for example be 3 - 5 m.
  • The tugboat 1 may have propulsion units 12 in the form of Voith Schneider Propellers. The tugboat 1 as shown has propulsion units 12 comprising a pair of azimuth thrusters.
  • Thus, the invention has been described by reference to the embodiments discussed above. It will be recognized that these embodiments are susceptible to various modifications and alternative forms well known to those of skill in the art without departing from the spirit and scope of the invention. Accordingly, although specific embodiments have been described, these are examples only and are not limiting upon the scope of the invention.
    • List of reference numerals
    • 1.
    Tugboat
    2.
    Single hull
    3.
    Deck
    4.
    Towing system
    5.
    Base
    6.
    Cart
    7.
    Winch
    8.
    Tug cable
    9.
    Vessel to be towed
    10.
    Propulsion system
    11.
    Body of water
    12.
    Propulsion unit
    13.
    Vertical plane of symmetry
    14.
    Waterline
    CP =
    centre point
    X =
    longitudinal direction
    L =
    length of the vessel
    Hmax =
    maximum hull height
    Hdraft =
    hull draft
    Hcp =
    vertical distance between centre point and waterline
    Hp =
    vertical distance between the centre of thrust of the propulsion units and the waterline
    Hmax =
    maximum hull height
    Wmax =
    maximum hull width
    T =
    tension exerted by tug cable on tugboat
    P =
    propulsive force exerted by propulsion unit on tugboat

Claims (10)

  1. Tugboat (1) having a longitudinal direction (X) and comprising a single elongated hull (2), a deck (3) and a carrousel-type towing system (4) having a circular base (5)connected to the deck, the base having a centre point (CP), the towing system further comprising a cart (6) that is moveable over the base over 360°, wherein the cart comprises a powered winch (7) during use provided with a tug cable (8) for towing vessels (9), wherein a propulsion system (10) is connected to the hull (2), for providing a propulsive force in a body of water (11), characterized in that the propulsion system comprises two propulsion units (12) each arranged below the hull's draft and capable of providing thrust over 360° in a plane below the hull's draft (Hdraft) and perpendicular to the tugboat's vertical plane of symmetry (13), said vertical plane of symmetry (13) extending in the longitudinal direction (X) of the tugboat, wherein the propulsion units (12) are positioned in the vertical plane of symmetry (13) and are aligned in the longitudinal direction, wherein one of the propulsion units is positioned in front of the centre point (CP) and the other one is positioned behind the centre point (CP) when seen along the longitudinal direction (X), and the distance between the propulsion units is at least 10% of a length (L) of the tugboat in the longitudinal direction (X), wherein the tugboat (1) is configured in such a way that during towing the vertical distance (Hcp) between the centre point (CP) and the waterline (14) divided by the vertical distance (Hp) between the centre of thrust of the propulsion units and the waterline (14) is 0,3 - 1,5.
  2. Tugboat (1) according to claim 1, wherein the propulsion units (12) comprise one or more Voith Schneider Propellers.
  3. Tugboat (1) according to claim 1 or 2, wherein the propulsion units (12) comprise one or more azimuth thrusters.
  4. Tugboat according to any one of the preceding claims, wherein one of the propulsion units is positioned in front of the centre point (CP) and the base (5) and the other one is positioned behind the centre point (CP) and the base (5) when seen along the longitudinal direction (X),
  5. Tugboat according to any one of the preceding claims, wherein the vertical distance (Hcp) between the centre point (Cp) and the water line (14) is in the range of 1,5 - 4,5 m, and wherein the vertical distance between the centre of thrust of the propulsion units and the water line is in the range of 3 - 5 m.
  6. Tugboat (1) according to any one of the preceding claims, wherein the tugboat (1) is configured in such a way that during towing the vertical distance (Hcp) between the centre point (CP) and the waterline (14) divided by the vertical distance (Hp) between the centre of thrust of the propulsion units (12) and the waterline (14) is 0,6 - 1,1.
  7. Tugboat according to any one of the preceding claims, wherein the distance between the propulsion (12) units is at least 30% of the length (L) of the vessel in the longitudinal direction.
  8. Method of operating a tugboat (1) according to any one of the preceding claims, comprising the steps of:
    - configuring the tugboat to attain such a draft during towing that the vertical distance (Hcp) between the centre point (CP) and the waterline (14) divided by the vertical distance (Hp) between the centre of thrust of the propulsion units and the waterline (14) is 0,3 - 1,5.
    - connecting the tug cable (8) to a vessel to be towed and maneuvering the tugboat (1) in such a way that the tug cable extends at an angle of 45 - 90° to the longitudinal direction of the vessel,
    - operating the powered winch (7) such that the tug cable (8) is under tension, wherein a hydrodynamic resistance force created by the submerged hull (2) is used to increase the tension of the tug cable (8),
    - using the propulsion units (12) to correct the orientation of the tugboat (1) with respect to the vessel to be towed.
  9. Method according to claim 8, wherein the orientation of the tugboat (1) is corrected with the propulsion units (12) in such a way, that the tug cable (8) remains at an angle of 45 - 90° to the longitudinal direction (X) of the tugboat (1).
  10. Method according to claim 9, wherein the orientation of the tugboat (1) is corrected with the propulsion units (12) in such a way, that the tug cable remains (8) at an angle of about 90° to the longitudinal direction (X) of the tugboat (1).
EP16716918.4A 2015-02-17 2016-02-02 Tugboat provided with a carrousel-type towing system Active EP3259180B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16716918T PL3259180T3 (en) 2015-02-17 2016-02-02 Tugboat provided with a carrousel-type towing system

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2014304A NL2014304B1 (en) 2015-02-17 2015-02-17 Tugboat provided with a carrousel-type towing system.
PCT/NL2016/050074 WO2016133382A1 (en) 2015-02-17 2016-02-02 Tugboat provided with a carrousel-type towing system

Publications (2)

Publication Number Publication Date
EP3259180A1 EP3259180A1 (en) 2017-12-27
EP3259180B1 true EP3259180B1 (en) 2019-06-19

Family

ID=55755629

Family Applications (1)

Application Number Title Priority Date Filing Date
EP16716918.4A Active EP3259180B1 (en) 2015-02-17 2016-02-02 Tugboat provided with a carrousel-type towing system

Country Status (12)

Country Link
EP (1) EP3259180B1 (en)
CA (1) CA2975978A1 (en)
CY (1) CY1121830T1 (en)
DK (1) DK3259180T3 (en)
ES (1) ES2735093T3 (en)
NL (1) NL2014304B1 (en)
PL (1) PL3259180T3 (en)
PT (1) PT3259180T (en)
SG (1) SG11201706651YA (en)
TR (1) TR201910183T4 (en)
WO (1) WO2016133382A1 (en)
ZA (2) ZA201705371B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
MY202273A (en) 2018-02-22 2024-04-22 Imc Corp Licensing B V Tug with an all around towing installation

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE881312C (en) * 1951-06-28 1953-06-29 Siemens Ag Tugs for ships
FR1158501A (en) * 1956-08-10 1958-06-16 Device for securing trailers to tugs
DE1191710B (en) * 1961-08-12 1965-04-22 Voith Gmbh J M Drive float for cargo ships or the like.
US5694877A (en) * 1996-06-24 1997-12-09 Hvide Marine Incorporated Ship docking vessel
ES2245528B1 (en) * 2002-07-26 2007-03-16 Sar Remolcadores, S.L AUTOMATIC SYSTEM OF COLLECTION AND HANDLING OF SIRGA FOR HITCH BETWEEN TOWING AND TOWING VESSEL.
NL1022266C1 (en) * 2002-12-24 2004-06-25 Novatug B V Operating installation of a towing device on a tugboat.
WO2006049483A1 (en) 2004-11-03 2006-05-11 Novatug Holding B.V. Tugboat with towing gear that can turn through 360 degrees
NL2004687C2 (en) * 2010-05-07 2011-11-08 Baldo Dielen Assessoria Ltda Vessel.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
ES2735093T3 (en) 2019-12-16
DK3259180T3 (en) 2019-07-22
WO2016133382A1 (en) 2016-08-25
TR201910183T4 (en) 2019-07-22
CA2975978A1 (en) 2016-08-25
PT3259180T (en) 2019-07-19
NZ734320A (en) 2023-08-25
ZA202002557B (en) 2022-05-25
CY1121830T1 (en) 2020-07-31
SG11201706651YA (en) 2017-09-28
ZA201705371B (en) 2022-03-30
PL3259180T3 (en) 2019-10-31
EP3259180A1 (en) 2017-12-27
NL2014304B1 (en) 2016-10-13

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