[unclebilly]

Originally Posted by TimT

Apparently you've never seen the results of a fracture high pressure line..

If the bridge sinking impacted the pipeline.. there can be damage removed from the point of impact..

Also gas leaking underground has this odd habit of following the trench.. makes for interesting situations in populated areas

Don't be so sure... I've been the professional engineer that did the failure analysis on fractured and blown high pressure lines (rated to 15,000 psi) several times. And I've written peer reviewed SPE papers on the matter, one made the JPT.

We also deal with sour gas pipelines here - not something you have much of in the US. When H2S leaks, people die. Failures involving H2S usually involve HIC but thats a different story.