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Infrastructure & Utility Business

Pipeline Maintenance and Management

Most of the JAPEX's natural gas pipeline is buried underground and is designed to continue safely gas supply to our clients with consideration of its structure, operation, and maintenance.

Pipeline Features

The main body of the pipeline uses high-tensile steel pipes which are highly flexible and resilient to internal and external pressure and is designed to withstand the big earthquake. As a result, our pipelines endured significant earthquakes including Miyagi Offshore Earthquake in 2003, Mid-Niigata Earthquake in 2004, and the Great East Japan Earthquake in 2011.

Steel pipes buried underground are applied an anti-corrosion coating and cathodic protection by the impressed current protection method. The impressed current protection method is to bury the insoluble electrode underground instead of the pipe, to connect them and pipeline body, and to be supplied external electric power for anti-corrosion so that it is a reliable and low-maintenance method suiting for long and large pipelines. Protecting from the natural corrosion by cathodic protection ensures its buried pipes to semi-permanently service time.

Schematic of Steel Pipe

Schematic of the Impressed Current Protection Method

Ensuring Safety

The monitoring center and supply plant keep track of the pipeline operational status around the clock by the SCADA (Supervisory Control And Data Acquisition) system to support our capability for safety respond to contingencies, such as remotely shutting down gas supply in the event of an emergency.

Also, it installs equipment for ensuring safety in the event of an emergency: the emergency shutdown valve (ESDV) in main valve stations and delivery points to clients for remotely shutting down gas supply and the gas diffusion stack in main points of the pipeline network for air emission of gas as necessary.

In addition, our staffs patrol the length of the pipeline, conduct maintenance and inspections of facilities, and make security labels and signs with utmost care to ensure safe operation.

Gas Supply Monitoring Center Gas Supply Monitoring Center

Inspection of Pipeline Facilities Inspection of Pipeline Facilities