Sub-high pressure A gas pipeline leakage monitoring system

The invention discloses a sub-high pressure A gas pipeline leakage monitoring system, which comprises a main station system and a substation system; the substation system comprises an infrasonic sensor, a pre-amplifier, a data acquisition system and a GPS (Global Positioning System) time service module; the main station system comprises a data processing system and a waveform display terminal; the infrasonic sensor is connected with a monitored pipeline, and the data acquisition system is connected with the data processing system; the infrasonic sensor receives and converts infrasonic signals in the pipeline into electric signals in real time; the pre-amplifier amplifies, filters and then transmits the electric signals to the data acquisition system; the data acquisition system converts the electric signals into data, and sends the acquired infrasonic data to the data processing system; by analyzing and processing the data sent by the data acquisition system, the data processing system judges whether and where leakage takes place. When the leakage of the gas pipeline happens, the sub-high pressure A gas pipeline leakage monitoring system can rapidly give the alarm in time, so that hazards caused by an accident can be reduced.