Corrosion Under Insulation

A recent PHMSA Advisory Bulletin warns the pipeline industry about Corrosion Under Insulation (CUI), which is frequently used on pipe transporting heavy crude oil.  Such products are often heated for more efficient transport, thus the pipe is wrapped with foam insulation over the coating, and then further covered with a tape wrap over the insulation.  The crude oil release from a Plains All American pipeline near Santa Barbara in May of 2015 used such thermal insulation, and the government’s investigation following that release prompted this Advisory from PHMSA.
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