[CedarDave]

Environmental laws are one reason old pipelines are being rehabilitated; they are already on rights-of-way that have been previously and historically used for fuel delivery. Although environmental studies are needed, they are far less onerous that those required for new lines. And when new lines cross federal lands, look out for an endless parade of EIS's, public hearings, court fights, appeals, etc. Yes, they are very much a big part of why we occassionally have localized energy shortages leading to high commodity prices in the US.

[snopercod]

I'm just curious. If I am not mistaken, The ASME Code for piping requires hydrostatic proof-testing from time to time to certify that the piping can safely handle the operating pressure. I have it in my head that the proof-test is to 1.5 times the maximum operating pressure, but maybe is's less.

Do they do periodic pressure testing on pipelines?