Anordning og fremgangsmate for akustikkbasert sandovervaking ved et rorsystem

The invention relates to a system or method for measuring and analyzing acoustic signals from a pipe, e.g. from solid particles or cleaning pigs transported with fluid flow in a pipe, the method comprising the following steps: *registering acoustic signals generated in the pipe in at least one time window, *splitting the signals in a number of frequency bands, *processing the filtered signals to calculate characteristics of the fluid flow in a pipe, the characteristics including mean and deviation of the signal in each frequency band, the characteristics being indicative of possible events occurring in the pipe.