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51313-02242-Mitigating Soil-Side Corrosion on Crude Oil Tank Bottoms Using Volatile Corrosion Inhibitors

Picture for Mitigating Soil-Side Corrosion on Crude Oil Tank Bottoms Using Volatile Corrosion Inhibitors
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Product Number: 51313-02242-SG
ISBN: 02242 2013 CP
Author: Tim Whited
Publication Date: 2013
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Soil-side corrosion of the bottom plates of above ground crude oil storage tanks is a major corrosion challenge in the oil & gas industry especially when these tanks are constructed on oiled-sand pads. Severe corrosion has been identified on tank bottoms at a crude oil tank farm in the Arabian Peninsula. Corrosion led to the costly replacement of bottom plates. The soil-side surfaces of the bottom plates were designed to be protected by a shallow anode impressed current cathodic protection (CP) system. The oily sand layer and air gaps under the bottom plates reduced CP effectiveness and resulted in severe corrosion.

To reduce corrosion damage volatile corrosion inhibitor (VCI) was injected into the air gap between the sand pad and the underside of the tank bottom during a scheduled maintenance outage. An electrical resistance (ER) probe corrosion monitoring system was also installed underneath the tank. Effectiveness of the VCI treatment was monitored using the ER probe system. Corrosion rate data from ER probes indicated that VCIs were effective in mitigating corrosion on carbon steel bottom plates during the first year after application. Extended monitoring will continue in subsequent years and be the subject of future papers. VCI technology has good potential to reduce crude tank bottom corrosion reduce maintenance costs and provide extended service life.
 

Soil-side corrosion of the bottom plates of above ground crude oil storage tanks is a major corrosion challenge in the oil & gas industry especially when these tanks are constructed on oiled-sand pads. Severe corrosion has been identified on tank bottoms at a crude oil tank farm in the Arabian Peninsula. Corrosion led to the costly replacement of bottom plates. The soil-side surfaces of the bottom plates were designed to be protected by a shallow anode impressed current cathodic protection (CP) system. The oily sand layer and air gaps under the bottom plates reduced CP effectiveness and resulted in severe corrosion.

To reduce corrosion damage volatile corrosion inhibitor (VCI) was injected into the air gap between the sand pad and the underside of the tank bottom during a scheduled maintenance outage. An electrical resistance (ER) probe corrosion monitoring system was also installed underneath the tank. Effectiveness of the VCI treatment was monitored using the ER probe system. Corrosion rate data from ER probes indicated that VCIs were effective in mitigating corrosion on carbon steel bottom plates during the first year after application. Extended monitoring will continue in subsequent years and be the subject of future papers. VCI technology has good potential to reduce crude tank bottom corrosion reduce maintenance costs and provide extended service life.
 

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Premature Failure of API 650 Oil Storage Tank Bottom Plates Due to Soil Side Corrosion

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The above ground storage tanks in the refinery are experiencing bottom plate underside (soil) corrosion at a high rate of 1mm/year. Results: Failure of 4 tanks within a period of 9 years. Observations, details of the CP survey, tests, results and forward path taken up.

 
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