Osaka Gas Network Co., Ltd.Osaka Gas Network Co., Ltd.
Daigas Group The Osaka Gas Group has taken a new step forward as the Daigas Group.

Disaster response

Low-cost and Highly Reliable Governor Seismic Shutoff and Remote Monitoring Shutoff System

Overview

Osaka Gas Network uses and operates a governor seismic shutoff system and a remote monitoring shutoff system by installing a seismic sensor (SI sensor) in about 3,000 district governors.
These systems are designed to prevent earthquake disasters by utilizing both the automatic seismic shutoff function, which automatically stops the gas distribution when a seismic sensor detects an earthquake for each district governor, and the remote shutoff function, which safely stops the gas distribution to damaged areas by determining the damage in the supply area.They also contribute greatly to ensuring stable supply of gas and safety and reducing maintenance costs, as described below.

Features

High durability and reliability

  • A highly durable design for long-term use has been achieved by reflecting the operational track record of existing control boards and the results of service life diagnosis(design service life: 10 years, expected service life: 15 years).
  • A very compact lightning protection device, which can withstand a direct lightning strike, is used for power lines and communication lines (in the case of wired communication).
  • The CPU is duplicated so that the sub CPU can send a failure alarm if the main CPU fails.
  • To ensure reliable functionality of automatic seismic shutoff and remote shutoff in the event of a large-scale earthquake, we conducted an environmental test, electric test (noise resistance test), and earthquake resistance test and confirmed that the systems operated normally.
Governor Seismic Shutoff and Remote Monitoring Shutoff System

Effect

Stable supply of gas

The pressure value and flow rate value of the supplied gas can be automatically measured and saved at regular intervals via the communication line from the center system, which is installed at the office. The supply status is checked regularly to ensure a stable supply of gas.

Ensuring safety

If the gas pressure and flow rate exceeds the normal range, the center system sends an alarm and sounds the buzzer immediately so that emergency response staff can take action quickly.

Reduction in maintenance costs

Previously, the pressure of supplied gas was generally managed using an analog self-recording pressure gauge. Chart paper had to be refilled regularly on-site.The remote monitoring system eliminates the need to refill the chart paper. Patrol inspections, which were conducted once a week, can be reduced to once a month.

System sales

We sell the “governor remote monitoring and control system,” which consists of a monitoring control board (trademark: NEOGLOG), which was developed based on the know-how acquired over about 10 years of operation of a governor remote monitoring system for about 3,000 medium-pressure governors, and a center system.We can design a system that takes into account the disaster prevention policy, organization, and structure of the gas supplier, and the characteristics of the supply area.