Method for detecting unauthorized access

Abstract

A method for detecting unauthorized access to oil, gas or other pipes, by monitoring the protective cathodic voltage and detecting changes in the voltage which are indicative of a technical failure or a deliberate attack on the pipe. A method for detecting leakage from a pipe using multiple channels/inputs, wherein a low frequency range input measures seismic noises, and a high frequency range input measures cavitation noises, and wherein a leakage indication is issued if both the low frequency and high frequency noises are simultaneously detected. A low power consumption Wireless communications protocol is used.

Dependencies are inferred from the claim text.