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51314-4337-Corrosion Protection of Soil Side Bottoms of Aboveground Storage Tanks

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Product Number: 51314-4337-SG
ISBN: 4337 2014 CP
Author: Efim Lyublinski
Publication Date: 2014
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Corrosion Protection of Soil Side Bottoms of Aboveground Storage TanksAbstractIn Aboveground Storage Tanks (ASTs) corrosion of soil side bottoms and double bottoms is unpredictable and can be up to 5 mm/year.  There are multiple tank bottom and foundation designs that address some of the corrosion problems but then cause other new corrosion issues. The soil side of tank bottom plates especially for larger ASTs cannot be effectively coated inspected or retroactively protected while the AST is in service. The typical corrosion protection method - cathodic protection system (CPS) is not universally effective and a viable alternative is needed. This paper focuses on case studies of bottom side floor corrosion protection using corrosion inhibitors. Once introduced under the AST by nature volatile corrosion inhibitors (VCIs) diffuse into all void spaces under tank bottoms – including the free space between sand/soil particles and protect the exposed metal plates. Soluble corrosion inhibitors (SCIs) mitigate corrosion when there is water under the tank bottoms. The systems are effective where a CPS is not and can be retrofitted under tanks in service. We will describe test results for a number of VCIs and SCIs that demonstrate their effectiveness in addressing corrosion problems. It is now possible to select a range of VCIs and SCIs based on the corrosive environmental conditions and the design of the tank bottoms to provide optimal protection. Initial testing in different aggressive corrosion environments has identified VCI and SCI compositions that can achieve efficiencies of 70-90% and exclude pitting corrosion.  Field trial and application experience has shown that inhibitor use can increase the anticipated tank service life from approximately 8-10 years to 25-30 years resulting in greatly reduced maintenance and replacement costs. We will also present synergistic systems (SS) that combine VCIs SCIs and CPS for double bottom corrosion protection.Keywords: Tanks AST bottom plate soil side inhibitor VCI SCI oil gas environment corrosion  retrofit design efficiency service life. 
Corrosion Protection of Soil Side Bottoms of Aboveground Storage TanksAbstractIn Aboveground Storage Tanks (ASTs) corrosion of soil side bottoms and double bottoms is unpredictable and can be up to 5 mm/year.  There are multiple tank bottom and foundation designs that address some of the corrosion problems but then cause other new corrosion issues. The soil side of tank bottom plates especially for larger ASTs cannot be effectively coated inspected or retroactively protected while the AST is in service. The typical corrosion protection method - cathodic protection system (CPS) is not universally effective and a viable alternative is needed. This paper focuses on case studies of bottom side floor corrosion protection using corrosion inhibitors. Once introduced under the AST by nature volatile corrosion inhibitors (VCIs) diffuse into all void spaces under tank bottoms – including the free space between sand/soil particles and protect the exposed metal plates. Soluble corrosion inhibitors (SCIs) mitigate corrosion when there is water under the tank bottoms. The systems are effective where a CPS is not and can be retrofitted under tanks in service. We will describe test results for a number of VCIs and SCIs that demonstrate their effectiveness in addressing corrosion problems. It is now possible to select a range of VCIs and SCIs based on the corrosive environmental conditions and the design of the tank bottoms to provide optimal protection. Initial testing in different aggressive corrosion environments has identified VCI and SCI compositions that can achieve efficiencies of 70-90% and exclude pitting corrosion.  Field trial and application experience has shown that inhibitor use can increase the anticipated tank service life from approximately 8-10 years to 25-30 years resulting in greatly reduced maintenance and replacement costs. We will also present synergistic systems (SS) that combine VCIs SCIs and CPS for double bottom corrosion protection.Keywords: Tanks AST bottom plate soil side inhibitor VCI SCI oil gas environment corrosion  retrofit design efficiency service life. 
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Picture for Corrosion Protection of Storage Tank Soil Side Bottoms—Application Experience
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51315-6016-Corrosion Protection of Storage Tank Soil Side Bottoms—Application Experience

Product Number: 51315-6016-SG
ISBN: 6016 2015 CP
Author: Efim Lyublinski
Publication Date: 2015
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Picture for Premature Failure of API 650 Oil Storage Tank Bottom Plates Due to Soil Side Corrosion
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Premature Failure of API 650 Oil Storage Tank Bottom Plates Due to Soil Side Corrosion

Product Number: 51317--9025-SG
ISBN: 9025 2017 CP
Author: Naif Abri
Publication Date: 2017
$20.00

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.

 
Picture for Mitigation of Soil-Side Bottom Corrosion of Aboveground Storage Tanks Utilizing Volatile Corrosion
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Mitigation of Soil-Side Bottom Corrosion of Aboveground Storage Tanks Utilizing Volatile Corrosion

Product Number: 51317--9462-SG
ISBN: 9462 2017 CP
Author: Kelly Baker
Publication Date: 2017
$20.00

Electrical resistance probes monitor mitigation of corrosion. Data will be presented from multiple installations demonstrating the ability of volatile corrosion inhibitors to mitigate corrosion for soil-side bottoms of aboveground storage tanks.
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