Issues regarding the corrosion protection of storage tank bottoms
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How to prevent corrosion on the lower surface of the storage tank bottom plate? If choosing an anti-corrosion coating, which type should be selected? What are the requirements for applying paint with a brush? Are there any specific standards that can be referred to?
The epoxy coal tar glass flake coating we used,…………
I’m not sure what kind of goods you’re referring to for storage – crude oil? Finished product? Or intermediate products? Go and check out the GB50393-2008 Technical Code for Corrosion Prevention of Steel Oil Storage Tanks; it provides detailed information on this topic. Table of Contents: 1 General Provisions… 5 2 Terms… 6 3 General Requirements… 9 4 Design… 11 4.1 Coating Protection… 11 4.2 Cathodic Protection… 13 5 Construction… 17 5.1 Qualifications of Construction Teams… 17 5.2 Surface Treatment… 17 5.3 Painting… 19 5.4 Application of Metal Coatings… 20 5.5 Implementation of Cathodic Protection… 21 5.6 Inspection and Control During Construction… 22 6 Heating Coils… 24 7 Acceptance… 25 8 Operation, Maintenance, and Inspection… 26 8.1 Coating Protection… 26 8.2 Cathodic Protection… 27 Appendix A Corrosion-Resistant Coatings for Oil Storage Tanks… 29 Appendix B Abrasives and Surface Treatment Equipment… 36 Appendix C Materials for Cathodic Protection in Oil Storage Tanks… 39 Appendix D Surface Treatment Grades and Their Determination… 43 Appendix E Dew Point Temperature Reference Table… 46 Appendix F Methods for Inspecting Painting Quality… 48 Appendix G Inspection and Acceptance Rules… 50 Appendix H Format for Acceptance Inspection Records… 52 Appendix J Testing Methods for Cathodic Protection Criteria… 55 Glossary of Terms Used in This Code… 58
Epoxy coal tar pitch coatings are suitable for anti-corrosion protection of pipes, oil tanks, gas holders, and the interior and exterior of concrete structures; they can also be used as coating layers for steel pipes, cast iron pipes, steel storage tanks, steel structures, as well as for concrete waterproofing and anti-corrosion purposes. There are several options available.
I talked to the designer today, and they said it’s not necessary to apply the coating, as the new regulations state that it’s optional. It seems there is no content related to corrosion prevention in GB50128
It’s better to brush it; once this thing is in use, it can’t be moved easily. There’s not even enough space for the text
Based on past experience, we usually brush it, but the designer said not to. We should be fine by following the design drawings for construction~
It definitely should be brushed. . . . . . . . . . . . . . . . . . .
According to **the standards, it should be coated; the bottom of the tank should be covered with asphalt sand, and this asphalt sand should be arranged so that it is higher in the center and lower at the edges. Under normal circumstances, this is fine. However, due to the temperature difference between the temperature inside the tank and the ground temperature, condensation water forms on the bottom of the tank. If no anti-corrosion measures are taken, corrosion will occur
The lower surface of the storage tank bottom plate should be protected against corrosion; there is a gap between the bottom plate and the bituminous sand, which makes it susceptible to corrosion by gases, otherwise it could lead to greater losses.