One thing I do know is that modern pipelines are now made with a Molybdenum allow--somewhere about 8% moly. Moly makes steels extremely corrosive resistant. Only Duplex Steel is better. They make Oceanic drill rigs with Duplex Steel, (Moly content between 16-20%).
Moly Steel can be dropped in the ocean for 100 years with no corrosion. If anyone has any experience with ships at sea, they will realize how significant that is.
Moly steel also has increased tensile strength. For that reason it is the steel of choice to build high-rise buildings, especially super hi-rises.
Will the use of this guarantee no problems ever? No. But people need to appreciate how the science has advanced. 40 year pipelines are a worry. In my opinion the variables should be tightened on them, and parts replaced with high priority.
Compared to Shipping and especially trucking, pipelines are incomparably more safe. However, one points out, while it is safer to fly in a jetliner than cross the street... but then again people are hit crossing the street occasionally--and if that happens to you, probability is little comfort.
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