Abstract: 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.

Abstract: The present invention relates to a ship or floating support (1) for transporting or storing liquid (3) constituted by a liquefied gas, preferably selected from methane, ethylene, propane, and butane, cooled in at least one large tank (2), preferably a cylindrical tank of polygonal cross-section, that is thermally insulated (2a) and of large size, with at least its smallest dimension in the horizontal direction, in particular its width, being greater than 20 m, preferably lying in the range 25 m to 50 m, and a volume greater than 10,000 m3, said large tank (2) being supported inside the hull (4) of the ship by a carrier structure (11), the ship being characterized in that it includes a plurality of devices for detecting the roughness of the liquid within said large tank(s), said devices being referred to below as “beacons” (5, 5-1, 5-2), and comprising: a) a vibration sensor of the vibratory accelerometer type suitable for measuring the amplitude of the acceleration (g) as a function of time (t) of the vibr