Hitachi, Ltd.

Kabushiki Kaisha Toshiba

Fujitsu Corporation

Mitsubishi Denki Kabushiki Kaisha

Nihon Musen Kabushiki Kaisha

Hitachi Control Systems, Inc.

Zaidanhouzin Kasenzyouho-senta

Shigeyuki Shimauchi

Motohisa Funabashi

Shigeru Suzuki

Teruji Sekozawa

Shinichiro Miyaoka

Mikio Yoda

Youichi Suzuki

Masayuki Doi

Hiromitsu Kurisu

Teruzi Sekozawa

Tadahiko Nakao

Yoshiyuki Kanbayashi

Yasuo Misawa

Fumito Shinomiya

Yasuo Koiwai

Tetsuro Sato

Susumu Miyamoto

Touru Uruno

Teruo Takagi

A pipeline breakage sensing system includes a plurality of pressure sensors installed on pipelines to measure pressure of a fluid. Each of these pressure sensors presumes a breakage location in cooperation with other neighboring sensors on the basis of a pressure change of the fluid and transmits information relating to the presumed breakage location. The pipeline breakage sensing system further includes a pressure sensor for detecting the occurrence of a seismic earthquake event, in addition to a managing center for sensing a breakage location on the basis of information transmitted from respective pressure sensors and by calculating a time correlated comparison between the superimposed pressure readings from neighboring pressure sensors used to detect the occurrence of such a fluid pressure change. Thereby, breakage of a pipeline network is sensed and the quantity of flow delivered through an affected pipeline is adjusted, stopped or regulated by control of one or more valves in accordance with a predetermined, weighted system of fluid flow requirements, customer ordered priorities and customer demand levels.

Pipeline breakage sensing system and sensing method

An automatic information receiving terminal device in a character/graphic information network system including a videotex communication network or a public communication network (telephone network) is connected to an information center through the videotex or public communication network so that various items of image information from the information center can be received by the terminal device. The terminal device having an internal clock and a time setting unit. The terminal device can automatically receive or reproduce desired information at an each time preset by the time setting means, so that the terminal device can automatically be operated without manual intervention so as to give emergency information or the like timely to a number of people.

Videotext communication network with a receiving terminal that

Method and system for controlling fluid transportation in a pipe network are disclosed. Pressures and flow rates at a predetermined number of points in the pipe network which number is smaller than the number of demand nodes in the pipe network are detected, demand volumes at the demand nodes are estimated based on known flow and pressure balance requirements for the pipe network and the detected flow rates and pressures, and the flow transportation in the pipe network is controlled in accordance with the estimated demand volumes such that the pressures at the demand nodes are brought to a reference pressure so that the pressures at the demand nodes at points other than the predetermined points are also brought to the reference pressure.

Method and system for controlling fluid transportation in a pipe network

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Tokyo, Japan

Shigeyuki Shimauchi