Method for detecting the tilt of a floating roof floating on a medium stored in a tank

A system for detecting the tilt of a floating roof floating on a medium stored in a tank, comprising:

• a radar level gauge mounted in a fixed position on the tank, wherein the radar level gauge is configure to emit signals in the direction of the floating roof and to receive echo signals reflected on the surface of the floating roof;
• and
• an edge device remotely located from the radar level gauge, wherein the edge device includes a first data interface for communication with the radar level gauge and a second data interface for communication with a server via internet in the cloud,
• wherein the system is configured to:
• determine and record a level of the floating roof during a time period, wherein the time period includes some filling/emptying cycles of the medium in the tank;
• detect and record echo amplitudes of the echo signals over the time period;
• filter the echo amplitudes and record the filtered echo amplitudes during the time period;
• calculate a gradient of the filtered echo amplitudes during the time period;
• calculate a threshold value for a tolerable deviation of the gradient of the filtered echo amplitudes during the time period;
• and
• generate an alert message that a roof tilting is detected if the deviation of the gradient of the filtered echo amplitudes falls behind the threshold.