| http://www.w3.org/ns/prov#value | - Based on the type of pipe and the degree of damage, we assign a letter ranking (A through F) to that location -- not to the pipeline itself.It is not correct to say that the F-ranks (or the A thru Es) are all the result of corrosion.Ranking can be the result of corrosion (typically, rust on the pipe exterior), mechanical damage such as nicks or dents, or a specific design or circumstance.
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