CITY GAS DAMAGE IN THE MID NIIGATA PREFECTURE EARTHQUAKE

Abstract

The supply to about 56, 800 households was stopped due to the earthquake. The gas pipe damage feature is that the main part had concentrated on the screw joint. Moreover, the case where the polyethylene pipe is damaged is not confirmed though about 25% of struck entrepreneur's low-pressure gas pipe was a polyethylene pipe. It was able to be confirmed that such a situation looked like the damage situation in the southern part of Hyogo Prefecture earthquake in 1995. The assistant outside the prefecture restored, and it took 2-4 week to the supply restart.