Gas line along Osaka Bay uses shield tunnel under seabed

Osaka Gas Co. Ltd., Osaka, this month is commissioning a 21-km gas transmission pipeline across an area of Osaka Bay from the Senboku LNG terminal to the Hokko Compressor, distribution station to meet increasing gas demand of the Osaka district, the second largest metropolitan area in Japan.The line has 7 MPa maximum allowable operating pressure (approximately 1,100 psi), 750 mm (30 in.) OD, and 19 mm (0.750 in.) WT. It was built in a shield tunnel under the seabed.The company encountered several design and construction problems in devising measures to counter subsidence of reclaimed land in the bay and anticipated seismic activity. Click here to enlarge imageAmong three proposed pipelin...

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