Piping Network Leak Detection System, as Well as Leak Detection Device and Leak Detection Method Used in Said System

A piping network leak detection system for detecting leaks of a gas or liquid flowing through piping in a piping network, the system temporarily accumulating a compressed gas or liquid compressed by a compressor in a supply tank and then supplying the compressed gas or liquid from the supply tank via the piping to a terminal facility consuming the compressed gas or liquid, the piping network leak detection system comprising:

• a supply tank pressure sensor detecting a pressure of the compressed gas or liquid supplied from the supply tank;
• a supply tank flow rate sensor detecting a flow rate of the gas or liquid from the supply tank;
• a terminal facility pressure sensor detecting a pressure at an entrance of the terminal facility;
• a piping network leak detection device;
• and
• a display device,
• wherein the piping network leak detection device includes:
• a time series measurement value acquisition unit acquiring and storing a time series measurement value of each pressure sensor and flow rate sensor pertaining to a time duration during operation of the compressor from the supply tank pressure sensor, the supply tank flow rate sensor, and the terminal facility pressure sensor;
• a time series measurement data extraction unit extracting time series measurement data exhibiting a high rate of change within a certain time duration from the acquired time series measurement value;
• a piping network model construction unit creating a piping network model including the compressor, the supply tank, the terminal facility, and the piping;
• a time series response calculation unit calculating a time series response of a flow rate and pressure on the basis of the piping network model, the extracted time series measurement data being used as a boundary condition in the calculation;
• a leak position/amount determination unit detecting the position and amount of a leak within the piping network on the basis of the calculated time series response;
• and
• an output display unit sending the leak position and leak amount to the display device.

A leak detection method for a compressed gas or liquid in a piping network, the compressed gas or liquid compressed by a compressor being temporarily accumulated in a supply tank and then supplied from the supply tank via piping to a terminal facility consuming the compressed gas or liquid, the leak detection method comprising:

• constructing a piping network model including the compressor, the supply tank, the terminal facility, and the piping;
• acquiring a time series measurement value for each of a supply tank pressure and supply tank flow rate supplied from the supply tank and a terminal facility pressure at an entrance of the terminal facility;
• calculating a time series response of the flow rate and pressure within the piping network on the basis of the piping network model, using the time series measurement value;
• and
• determining and displaying the position and amount of a leak of the gas or liquid within the piping network on the basis of the calculated time series response of the flow rate and pressure.