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I think this list is a good start. I don’t know how you would determine “frequently”, either as a function of miles of pipe or time.

For more periods of time:

This link below also provides some useful information, although it’s an old post and some of the links are broken:

One of the key points is the number of pipeline inspectors for every mile of pipeline.

Even though older pipes are more likely to break/leak, it’s the potential for disaster that makes any pipeline dangerous.

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