We are promoting the advancement of safety technology, including focusing efforts on the development of disaster prevention systems in readiness for major earthquakes and other disasters to achieve disaster-resistant and stable gas supply.
Supreme is a real-time earthquake disaster prevention system to prevent secondary disasters in a major earthquake by gathering data from seismographs at around 4,000 locations and using remote operation where necessary to control gas supply in block units.
System SummaryWe install seismographs called safety sensors in the district pressure regulators which supply gas at low pressure. Installed at an extremely high density of around one unit per 1km2, they automatically shut off gas supply when detecting an earthquake which could potentially harm conduits and structures. SUPREME is a system which shuts down gas supply in a low-pressure gas conduit network, based on information from those seismographs.
■Locations of Seismographs in the Tokyo Gas Service Area and Temblor Strengths in the Southern Kanto Region during the Great East Japan Earthquake on March 11, 2011