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NZ751313B2 - Hydraulic mooring cable holding device, system and method - Google Patents
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NZ751313B2 - Hydraulic mooring cable holding device, system and method - Google Patents

Hydraulic mooring cable holding device, system and method

Info

Publication number
NZ751313B2
NZ751313B2 NZ751313A NZ75131317A NZ751313B2 NZ 751313 B2 NZ751313 B2 NZ 751313B2 NZ 751313 A NZ751313 A NZ 751313A NZ 75131317 A NZ75131317 A NZ 75131317A NZ 751313 B2 NZ751313 B2 NZ 751313B2
Authority
NZ
New Zealand
Prior art keywords
hydraulic
hydraulic cylinder
holding device
cable holding
pressure
Prior art date
Application number
NZ751313A
Other versions
NZ751313A (en
Inventor
Der Burg Gerrit Van
Original Assignee
Shoretension Holding Bv
Filing date
Publication date
Priority claimed from NL2017431A external-priority patent/NL2017431B1/en
Application filed by Shoretension Holding Bv filed Critical Shoretension Holding Bv
Publication of NZ751313A publication Critical patent/NZ751313A/en
Publication of NZ751313B2 publication Critical patent/NZ751313B2/en

Links

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
    • B63B2021/003—Mooring or anchoring equipment, not otherwise provided for
    • 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
    • B63B2021/003—Mooring or anchoring equipment, not otherwise provided for
    • B63B2021/005—Resilient passive elements to be placed in line with mooring or towing chains, or line connections, e.g. dampers or springs
    • 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
    • B63B2021/003—Mooring or anchoring equipment, not otherwise provided for
    • B63B2021/008—Load monitors
    • 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
    • B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
    • B63B2021/203—Mooring cables or ropes, hawsers, or the like; Adaptations thereof
    • 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
    • B63B21/20—Adaptations of chains, ropes, hawsers, or the like, or of parts thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B1/00—Installations or systems with accumulators; Supply reservoir or sump assemblies
    • F15B1/26—Supply reservoir or sump assemblies
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/024—Pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/0401—Valve members; Fluid interconnections therefor
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B13/00—Details of servomotor systems ; Valves for servomotor systems
    • F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
    • F15B13/04—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor
    • F15B13/042—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors for use with a single servomotor operated by fluid pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
    • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
    • F15B2211/00—Circuits for servomotor systems
    • F15B2211/20—Fluid pressure source, e.g. accumulator or variable axial piston pump
    • F15B2211/25—Pressure control functions
    • F15B2211/253—Pressure margin control, e.g. pump pressure in relation to load pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G11/00—Means for fastening cables or ropes to one another or to other objects; Caps or sleeves for fixing on cables or ropes

Abstract

hydraulic mooring cable holding device provides a hydraulic cylinder-piston combination (20) for controlling the force on a mooring cable between one end of a ship and a mooring point. An overpressure protection part (26) with hydraulic liquid passing from the hydraulic cylinder (20) to a reservoir (260) when the pressure in the cylinder exceeds a threshold value, and returns the hydraulic liquid when the pressure has dropped. An auxiliary reservoir (24) with a steeper pressure response than the main reservoir (260) is connected in parallel with the main reservoir. The auxiliary reservoir may be connected to and/or disconnected from the cylinder under control of a sensor or a further mooring device at the other end of the ship, to reduce movement of the ship e.g. in swell. Furthermore, pressure from the auxiliary reservoir may be used to drive an electric generator.

Claims (12)

THE CLAIMS DEFINING THE INVENTION ARE AS FOLLOWS: -
1. A hydraulic mooring cable holding device, comprising - a hydraulic cylinder, a piston in said hydraulic cylinder, and connections to said hydraulic cylinder and said piston for connecting the device in a mooring cable connection between a ship and a 5 mooring point; - an overpressure protection part coupled to the hydraulic cylinder, the overpressure protection part comprising a main reservoir containing gas and hydraulic liquid, the overpressure protection part comprising an overpressure valve and a one way valve, coupled in parallel to 10 each other between the hydraulic cylinder and the main reservoir, the overpressure valve configured to pass hydraulic liquid from the hydraulic cylinder to the main reservoir when a difference between a first pressure in the cylinder and a second pressure in the main reservoir exceeds a first threshold value, the one way valve 15 configured to pass hydraulic liquid from the main reservoir to the hydraulic cylinder when the difference drops below a second threshold value, lower than the first threshold value; - an auxiliary reservoir coupled to the hydraulic cylinder, the auxiliary reservoir containing gas and hydraulic liquid, the main reservoir 20 having a first pressure-volume change characteristic that differs from second a pressure-volume change characteristic of the auxiliary reservoir, in the sense that the pressure in main reservoir changes less than the pressure in auxiliary reservoir for equal exchanges of volume of the hydraulic liquid from the hydraulic cylinder; 25 - a controllable valve coupled between the auxiliary reservoir and the hydraulic cylinder and configured, when opened, to allow hydraulic pressure communication between the auxiliary reservoir to the MA MARK RKED ED- -UP UP COPY COPY hydraulic cylinder and, when closed, to prevent the hydraulic pressure communication; and - a control unit, comprising an input for receiving a sensor signal and/or command signals, an output coupled to a control input of the 5 controllable valve, the control unit being configured to control opening and closing of the controllable valve dependent on the sensor signal and/or command signals.
2. A hydraulic mooring cable holding device according to claim 1, comprising a further overpressure valve coupled between the hydraulic 10 cylinder and the auxiliary reservoir, the further overpressure valve configured to pass hydraulic liquid from the hydraulic cylinder to the auxiliary reservoir when a difference between a first pressure in the main reservoir and a third pressure in the auxiliary reservoir exceeds a third threshold value, the third threshold value lying between the first and 15 second threshold value.
3. A hydraulic mooring cable holding device according to claim 2, comprising a further one way valve coupled between the hydraulic cylinder and the auxiliary reservoir, the further one way valve configured to pass hydraulic liquid from the auxiliary reservoir to the hydraulic cylinder when 20 the difference drops below the second threshold value.
4. A hydraulic mooring cable holding device according to claim 1 comprising a fluid connection between the auxiliary reservoir and the hydraulic cylinder, configured to equalize the hydraulic liquid pressures in the hydraulic cylinder and the auxiliary reservoir at least at all pressures at 25 which the overpressure valve remains closed.
5. A hydraulic mooring cable holding device according to any one of the preceding claims, comprising in a fluid flow channel between the hydraulic cylinder and the auxiliary reservoir and a fluid flow driven electrical power generator connected to the fluid flow channel. MA MARK RKED ED- -UP UP COPY COPY
6. A hydraulic mooring cable holding device according to any one of the preceding claims, wherein the control unit comprises a communication device for receiving information and/or commands from a further hydraulic mooring cable holding device or a central unit, and wherein the control unit 5 is configured to control opening of the controllable valve dependent on the information and/or commands.
7. A hydraulic mooring cable holding device according to claim 6, comprising - a position and/or movement sensor configured to measure a position 10 and/or movement of the piston relative to the hydraulic cylinder, wherein - the control unit being configured to transmit information or a command derived from the position and/or movement sensor via the communication device to the further hydraulic mooring cable holding 15 device or the central unit, for use to control the further hydraulic mooring cable holding device.
8. A hydraulic mooring system comprising at least two hydraulic mooring cable holding devices according to any one of the preceding claims, located on a quayside to exert pulling forces with opposite direction 20 components along the direction of the quayside on mooring cables connected to a same ship.
9. A method of holding a moored ship, using a first and second cable holding device, each comprising a hydraulic cylinder and a piston in the hydraulic cylinder, a main reservoir and an auxiliary reservoir containing 25 hydraulic liquid and gas, the method comprising - coupling a first and second mooring cable from the ship to a quayside, via the piston and hydraulic cylinder of the first and second hydraulic mooring cable holding device respectively, the first and second mooring cable exerting forces on the ship with opposite direction 30 components along the direction of the quayside; MA MARK RKED ED- -UP UP COPY COPY - releasing hydraulic fluid from the hydraulic cylinder to the main reservoir in the first and second cable holding device respectively, when a force on the first or second mooring cable exceeds a first threshold respectively; 5 - returning hydraulic liquid from the main reservoir to the hydraulic cylinder in the first and second cable holding device respectively, when a hydraulic pressure in the main reservoir is more than a second threshold below a threshold in the first and second cable holding device respectively, 10 - providing hydraulic pressure communication fluid between the hydraulic cylinder to the auxiliary reservoir in the first and second cable holding device respectively, during a phase wherein no hydraulic fluid is released from or returned to the hydraulic cylinder by the main reservoir in the first and second cable holding device 15 respectively.
10. A method according to claim 9, wherein the hydraulic pressure communication is selectively activated in the first and second cable holding device respectively in response to detection that the second and first cable holding device hauls in the second or first mooring cable. 20
11. A method according to claim 9 or claim 10, wherein the hydraulic fluid is transferred from the hydraulic cylinder to the auxiliary reservoir in the first and second cable holding device when the hydraulic fluid pressure in the hydraulic cylinder exceeds a pressure in the auxiliary reservoir by a third threshold. 25
12. A method according to any of one of claims 9 to 11, comprising driving an electrical power generator by a hydraulic liquid pressure difference between the auxiliary reservoir and the hydraulic cylinder in the first and second cable holding device. Y^~^od k^-^Ol M N) -K O O CD CD K) Tl
NZ751313A 2017-09-07 Hydraulic mooring cable holding device, system and method NZ751313B2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL2017431A NL2017431B1 (en) 2016-09-07 2016-09-07 Hydraulic mooring cable holding device, system and method
PCT/NL2017/050588 WO2018048303A1 (en) 2016-09-07 2017-09-07 Hydraulic mooring cable holding device, system and method

Publications (2)

Publication Number Publication Date
NZ751313A NZ751313A (en) 2025-03-28
NZ751313B2 true NZ751313B2 (en) 2025-07-01

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