A news item reports that chlorine gas leaked from one of the pipes crossing a road in a factory in Chennai. From the picture that is accompanying the article it appears that the leak occurred near a culvert. Read the full article in this link.
While I am not commenting on the cause of the leak, if you have pipes carrying hazardous chemicals crossing roads through culverts, ensure that they are inspected for corrosion and thickness reduction. Especially vulnerable are the drain and vent points. Your mechanical integrity program must cover this.
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