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Some 1,401 underground diesel storage tanks were analyzed for average maximum pit depths over the years 2003 till 2016. The results showed that since the addition of biodiesel the average pit depth increased due to Microbiologically Influenced Corrosion (MIC).
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CP coupons have been used since the 1930s by several of the pioneers of the corrosion-control industry, both in North America and in Europe. Over the last two decades, the use of CP coupons has been rediscovered as a practical method to determine the level of polarization of a buried structure and to confirm the voltage drop in a potential measurement. Acceptance of CP coupon technology is slowly occurring. Research sponsored by the pipeline industry has explored the use of CP coupons and has helped validate the use of this technology.
HISTORICAL DOCUMENT. Applications for cathodic protection (CP) coupons attached to buried pipelines to determine the level of corrosion protection provided by a CP system.