Floating support or vessel equipped with a device for detecting the movement of the free surface of a body of liquid
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
B63B-025/08
B63B-003/08
B63B-009/00
B63B-009/04
출원번호
US-0320487
(2010-05-07)
등록번호
US-8770125
(2014-07-08)
우선권정보
FR-09 53202 (2009-05-14)
국제출원번호
PCT/FR2010/050881
(2010-05-07)
§371/§102 date
20120104
(20120104)
국제공개번호
WO2010/130925
(2010-11-18)
발명자
/ 주소
Guerrier, Alain
출원인 / 주소
Saipem S.A.
대리인 / 주소
Cozen O'Connor
인용정보
피인용 횟수 :
4인용 특허 :
4
초록▼
A ship or floating support for transporting/storing liquid constituted by a liquefied having a plurality of beacon devices for detecting roughness of liquid within the tank, each beacon having a vibration sensor for measuring amplitude of the acceleration (g) as a function of time (t) of the vibrato
A ship or floating support for transporting/storing liquid constituted by a liquefied having a plurality of beacon devices for detecting roughness of liquid within the tank, each beacon having a vibration sensor for measuring amplitude of the acceleration (g) as a function of time (t) of the vibratory movements of a wall on which the beacons are fastened, and an electronic calculation unit having a microprocessor and memory for processing a signal as measured by the vibration sensor, and a device for transmitting the signal to a supervisor or central unit.
대표청구항▼
1. A ship or floating support for transporting or storing a liquid constituted by a liquefied gas, cooled in at least one tank having a width, said tank being thermally insulated and having at least said width greater than 20 m, and a volume greater than 10,000 m3, said tank being supported inside a
1. A ship or floating support for transporting or storing a liquid constituted by a liquefied gas, cooled in at least one tank having a width, said tank being thermally insulated and having at least said width greater than 20 m, and a volume greater than 10,000 m3, said tank being supported inside a hull of a ship by a carrier structure, the ship having a plurality of beacons for detecting roughness of the liquid within said tank(s), each of said beacons comprising: a) a vibratory accelerometer vibration sensor for measuring the amplitude of acceleration (g) as a function of time (t) of vibratory movements of a wall of said tank or of a wall of the ship that is not in contact with sea water, said wall of the ship including a deck of the ship or a wall of an internal structure of the ship, said vibration sensor being fastened on said wall outside said tank;b) an electronic calculation unit having a microprocessor and an incorporated memory, for processing a signal as measured by said vibration sensor, to yield a processed signal, in order at least to eliminate background noise from said measured signal that is specific to the ship, and to detect movement of the liquid inside said tank by comparing values of the processed signal with predetermined threshold values beyond which the roughness of a liquid free surface is considered as constituting a risk of damaging deformation or deterioration of said wall; andc) a transmitter for transmitting said processed signal of the electronic calculation unit to a central unit. 2. The ship or floating support according to claim 1, wherein said vibration sensor is a piezo-resistive accelerometer. 3. The ship or floating support according to claim 1, wherein said transmitter comprises an antenna and a transceiver suitable for transforming said processed signal into radio waves. 4. The ship or floating support according to claim 1, wherein said transmitter comprises optical fiber cables and a signal processing interface for transforming said processed signal into light signals suitable for being conveyed via said optical fiber cables. 5. The ship or floating support according to claim 1, wherein said vibration sensor is constituted by a three-axis vibratory accelerometer. 6. The ship or floating support according to claim 1, wherein one of said beacons further includes an additional device suitable for detecting movements specific to the ship and for triggering activation by said beacons of all said electronic calculation units, said triggering of activation of said electronic calculation units taking place from a predetermined threshold value of an amplitude of said movements of the ship. 7. The ship or floating support according to claim 6, wherein said additional device suitable for detecting movements of the ship is a pendular inclinometer or an inertial unit-suitable for determining a roll angle of a side wall of a hull of the ship or floating support, said threshold value being a roll angle of at least 5° relative to vertical. 8. The ship or floating support according to claim 1, wherein said electronic calculation unit is suitable for being activated from a measurement of a threshold value for said amplitude of acceleration (g) as a function of time (t) of said vibratory movements. 9. The ship or floating support according to claim 1, wherein each said beacons is powered by a power supply consisting of a storage battery or a supercapacitor powering said vibratory accelerometer, and said electronic calculation unit. 10. The ship or floating support according to claim 9, wherein said power supply further includes a thermocouple in which a cold junction is installed between a cold internal wall of said tank and said beacon, said beacon constituting a hot junction of the thermocouple, said thermocouple serving to generate a current continuously for powering said beacon and continuously recharging said storage battery or supercapacitor. 11. The ship or floating support according to claim 1, wherein said beacons are secured to a deck of the ship and/or to a side wall of a system for supporting and insulating walls of said tank inside a hull of the ship facing a side wall of the hull, said beacons being situated in the corners of said tank at longitudinal ends of said tank. 12. The ship or floating support according to claim 11, wherein said beacons are positioned facing a dihedral angle formed by corners of said tank between a vertical longitudinal side wall, a vertical transverse wall, and a ceiling wall of said tank, or a trihedron formed by two planes of a ceiling wall of said tank that are disposed angularly relative to each other, and a transverse vertical side wall of said tank. 13. The ship or floating support according to claim 1, comprising a methane tanker transport ship converted into a floating storage ship that is anchored at a fixed location, in which a filling level of at least one tank is determined as a function of roughness of the liquid contained in said tank as detected and calculated by said beacons. 14. A method of detecting roughness of a liquid free surface within one or more tanks of a ship according to claim 6, the method comprises the following successive steps: 1) providing said measured amplitude of acceleration (g) as a function of time (t) of said vibratory movements of said wall with said vibration sensor;2) triggering said activation of said electronic calculation unit when said the movement of the ship reaches a said predetermined threshold value;3) performing said signal processing with said electronic calculation unit to yield said processed signal; and2) transmitting values of said processed signal obtained in step 3) from said electronic calculation unit to said central unit. 15. The ship or floating support according to claim 1, wherein said liquefied gas is selected from methane, ethylene, propane and butane. 16. The ship or floating support according to claim 1, wherein said tank is a cylindrical tank having a polygonal cross section. 17. The method of claim 14, wherein in step 3) said electronic calculation unit performs the following signal-processing steps: 3.1) using a Fourier transform in real time to process a variation of said measured signal to calculate a variation in amplitude of acceleration (g) as a function of frequency (F) of a vibratory wave of said measured signal over a given period of time (Δt), and then calculating an energy spectral density and/or a power spectral density;3.2) filtering the variation signal obtained in step 3.1) to eliminate therefrom the background noise due to vibration that is specific to the ship; then3.3) calculating maximum time acceleration values obtained by an inverse Fourier transform of said variation in amplitude of acceleration (g) as a function of frequency (F) obtained in step 3.2), and calculating values of maximum energy spectral density (e1, e2) and/or of maximum power spectral density (P0), respectively, of said energy spectral density and/or said power spectral density calculated in step 3.2); and3.4) comparing said maximum time acceleration values and said maximum energy spectral density values (e1, e2) and/or said maximum power spectral density values (P0) respectively of step 3.3) with respective predetermined threshold values (S1, emax, pmax) thereof from which roughness of said liquid free surface is considered as constituting a risk of damaging deformation or deterioration to said wall;wherein in step 4), said electronic calculation unit transmits said maximum time acceleration values, said maximum energy spectral density values (e1, e2), and/or maximum power spectral density values (P0), respectively, of step 3.3) to the central unit if said threshold value of step 3.4) is reached by at least one of said beacons.
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이 특허에 인용된 특허 (4)
Beese John G. (Lisvane GB7) Peters Robert M. (Lakeside GB7) Wade Malcolm V. (Cathays GB7), Devices for detecting fluid flow.
Jones, Matthew Daniel; Grimm, III, Edward Henry, Retrofitting a conventional containment vessel into a complete integral tank double-hull cargo containment vessel.
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