Menu
Search
Filters
Close
Menu

51318-11567-Methodologies to Evaluate Compatibility between Cathodic Protection and Vapor Corrosion Inhibitors for Tank Bottom Applications

Picture for Methodologies to Evaluate Compatibility between Cathodic Protection and Vapor Corrosion Inhibitors for Tank Bottom Applications
Available for download

Compatibility between vapor corrosion inhibitors (VCI) and cathodic protection (CP) for the tank bottom application. Guidelines presented for selecting an effective corrosion mitigation strategy for combined VCI and CP systems.

Product Number: 51318-11567-SG
Author: Sujay Math / Pavan K. Shukla
Publication Date: 2018
Industry: Pipelines, Tanks, and Underground Systems
$0.00
$20.00
$20.00

 

Sujay Math / Pavan K. Shukla

 

Compatibility between vapor corrosion inhibitors (VCI) and cathodic protection (CP) for the tank bottom application. Guidelines presented for selecting an effective corrosion mitigation strategy for combined VCI and CP systems.

 

Prevention of soil-side corrosion of the bottom plates of Aboveground Storage Tanks (ASTs) is a major challenge for the oil and gas storage industry. AST bottom plates are generally 0.25 inch (6.35 mm) thick A36 carbon steel. Literature suggests that the corrosion rate of the soil–side bottoms can be up to 200 mpy (5 mm/year). The soil-side surfaces of the bottom plates are usually protected by an impressed current cathodic protection (CP) system. However, when the bottom plate flexes the tank fill levels are varied, creating air gaps between the bottom plate and the tank bed leading to reduced CP effectiveness and potential corrosive conditions for the tank bottoms. Furthermore, in many situations, CP could become ineffective due to the poor ionic conductivity within tank beds and failure of anodes. Limited research and fieldwork have shown that vapor corrosion inhibitors (VCIs) by themselves or in combination with CP can be used to protect the bottoms of ASTs from external corrosion. VCIs could reduce corrosion incidents by 70–90 percent and decrease the incidence of pitting corrosion. This paper discusses methodologies to evaluate the compatibility between VCI and CP for the tank bottom application. Experimental work is reported to evaluate the CP criteria applicability in presence of VCIs, the work also provides a guideline for selecting an effective corrosion mitigation strategy for combined VCI and CP systems. In summary, VCI and CP, used in combination, are found to have a synergistic interaction to mitigate tank–bottom corrosion to acceptable levels.

Key words: Vapor Corrosion Inhibitors, Cathodic Protection, Above Ground Storage Tanks, CP Criteria

 

 

Sujay Math / Pavan K. Shukla

 

Compatibility between vapor corrosion inhibitors (VCI) and cathodic protection (CP) for the tank bottom application. Guidelines presented for selecting an effective corrosion mitigation strategy for combined VCI and CP systems.

 

Prevention of soil-side corrosion of the bottom plates of Aboveground Storage Tanks (ASTs) is a major challenge for the oil and gas storage industry. AST bottom plates are generally 0.25 inch (6.35 mm) thick A36 carbon steel. Literature suggests that the corrosion rate of the soil–side bottoms can be up to 200 mpy (5 mm/year). The soil-side surfaces of the bottom plates are usually protected by an impressed current cathodic protection (CP) system. However, when the bottom plate flexes the tank fill levels are varied, creating air gaps between the bottom plate and the tank bed leading to reduced CP effectiveness and potential corrosive conditions for the tank bottoms. Furthermore, in many situations, CP could become ineffective due to the poor ionic conductivity within tank beds and failure of anodes. Limited research and fieldwork have shown that vapor corrosion inhibitors (VCIs) by themselves or in combination with CP can be used to protect the bottoms of ASTs from external corrosion. VCIs could reduce corrosion incidents by 70–90 percent and decrease the incidence of pitting corrosion. This paper discusses methodologies to evaluate the compatibility between VCI and CP for the tank bottom application. Experimental work is reported to evaluate the CP criteria applicability in presence of VCIs, the work also provides a guideline for selecting an effective corrosion mitigation strategy for combined VCI and CP systems. In summary, VCI and CP, used in combination, are found to have a synergistic interaction to mitigate tank–bottom corrosion to acceptable levels.

Key words: Vapor Corrosion Inhibitors, Cathodic Protection, Above Ground Storage Tanks, CP Criteria

 

Product tags
Also Purchased
Picture for Premature Failure of API 650 Oil Storage Tank Bottom Plates Due to Soil Side Corrosion
Available for download

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 Cathodic Protection System for Hot Sulphur Tank Bottom
Available for download

51316-7019-Cathodic Protection System for Hot Sulphur Tank Bottom

Product Number: 51316-7019-SG
ISBN: 7019 2016 CP
Author: Salim Debbache
Publication Date: 2016
$20.00

Cathodic protection of hot tank bottom tanks requires specific design parameters. This paper presents the design, installation details and commissioning results for two hot sulphur tank cathodic protection using impressed current titanium / Mixed Metal Oxide ribbon anode grid system.

 
Picture for Successful Implementation of a Corrosion Management Strategy by Online Injection of Vapor Phase Corrosion Inhibitors to Extend Storage Tank Floor Life
Available for download

51318-11428-Successful Implementation of a Corrosion Management Strategy by Online Injection of Vapor Phase Corrosion Inhibitors to Extend Storage Tank Floor Life

Product Number: 51318-11428-SG
Author: Asad Al Ghafri / Jayant R Nair / Naif Al Abri / Latifa Al Shibli
Publication Date: 2018
$20.00

Oil storage tanks experienced accelerated corrosion from the soil side. The short term strategy adopted was to drill under the tanks and inject vapor phase corrosion inhibitors to extend the tank floor life in a risk-rated phased effort for the 48 tanks.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support