Epoxy Coated Steel Tank: Coating Process and Performance
Created on 09.29
Epoxy Coated Steel Tank: Coating Process and Performance
What Is an Epoxy Coated Steel Tank?
An epoxy coated steel tank is a carbon-steel tank protected by a two-part liquid epoxy film on the interior (and often exterior). The epoxy gives a tough, chemical-resistant barrier for water and mild process duties, applied after blast-cleaning and cured before service.
How Does It Work?
Steel panels are abrasive-blasted to a clean profile, then a two-part epoxy is sprayed and cured to a specified film thickness. Bolted together with gaskets, the tank relies on the epoxy film as its corrosion barrier; holiday testing confirms continuity before commissioning.
Key Types, Components, and Features
Bolted epoxy tank. Shop-coated panels, field-bolted.
Welded epoxy-lined tank. Field-welded with internal epoxy.
Key components: steel panel, epoxy film, primer, gasket, roof, nozzles.
Applications
· - Potable and process water
· - Industrial wastewater (mild)
· - Fire-protection reserves
· - Mild chemical and reagent duties
Technical Considerations
Materials. Carbon steel + liquid epoxy film.
Surface prep. Abrasive blast to specified profile.
Film thickness. Measured and verified per coat.
Corrosion. Epoxy film is the barrier; below GFS inertness for some media.
Standards. AWWA, ISO 28765 context, NSF/ANSI 61 for potable where certified.
Installation / maintenance. Avoid film damage; inspect and touch up.
Service life. Good with film integrity and upkeep.
Project Case Study
Case Study — Namibia — Drinking water (44900m³, 4, completed 2022-09)
Project Background
Project type: Potable water storage. Industry: Municipal water supply. Location: Namibia. Application: Drinking water storage / treatment. Objective: provide a reliable, standards-referenced above-ground containment with controlled quality and a practical erection schedule. (Note: this is a verified bolted-steel tank reference illustrating the panelized, bolted construction that also underpins the supplier's bolted silos; silo projects apply the same shop-controlled panel quality to dry-bulk storage.)
Project Requirements
- Storage capacity: 44900m³
- Quantity: 4
- Tank size: φ41.26×8.4 m(H) 4 unit
- Storage medium: Drinking water
- Applicable standards: NSF/ANSI 61, ISO 28765, AWWA D103-09
- Site limitation: controlled quality, practical schedule
Technical Challenges
The duty required a large, code-compliant volume with quality that did not depend on variable field welding. A factory-controlled bolted system reduces on-site variables in coating and joint quality.
Engineering / Product Solution
- Tank type: Glass-Fused-to-Steel (GFS) bolted tank
- Material: low-carbon steel panels with vitreous enamel coating fused at 820–930°C
- Roof: Aluminum flat roof
- Structural configuration: bolted panel shell on a concrete ring beam with gasketed joints
- Foundation: engineered concrete ring beam with anchor bolts
- Standards applied: NSF/ANSI 61, ISO 28765, AWWA D103-09
Project Implementation
Panels were manufactured and (for GFS) shop-enameled under factory quality control, then shipped for bolted erection on site. Gasketed joints and structural fasteners were installed to procedure and inspected per the project quality plan. (Specific commissioning steps beyond the supplied record are not stated.)
Project Outcome
- Status: Completed (2022-09)
- Capacity achieved: 44900m³ across 4
- Outcome: above-ground storage delivered as a bolted, standards-referenced system
Project Information | Details |
Project Type | Potable water storage |
Location | Namibia |
Industry | Municipal water supply |
Application | Drinking water storage / treatment |
Product | Glass-Fused-to-Steel (GFS) bolted tank |
Capacity | 44900m³ |
Quantity | 4 |
Material | Glass-Fused-to-Steel (GFS) |
Standards | NSF/ANSI 61, ISO 28765, AWWA D103-09 |
Project Status | Completed (2022-09) |
Additional Reference — Canada — Livestock wastewater (1248m³, 1, completed 2025-02)
Project Background
Project type: Livestock wastewater treatment / anaerobic digestion. Industry: Livestock / agriculture. Location: Canada. Application: Livestock wastewater storage / treatment. Objective: provide a reliable, standards-referenced above-ground containment with controlled quality and a practical erection schedule. (Note: this is a verified bolted-steel tank reference illustrating the panelized, bolted construction that also underpins the supplier's bolted silos; silo projects apply the same shop-controlled panel quality to dry-bulk storage.)
Project Requirements
- Storage capacity: 1248m³
- Quantity: 1
- Tank size: φ13.76×8.4 m(H) 1 unit
- Storage medium: Livestock wastewater
- Applicable standards: ISO 28765, AWWA D103-09
- Site limitation: controlled quality, practical schedule
Technical Challenges
The duty required a large, code-compliant volume with quality that did not depend on variable field welding. A factory-controlled bolted system reduces on-site variables in coating and joint quality.
Engineering / Product Solution
- Tank type: Glass-Fused-to-Steel (GFS) bolted tank
- Material: low-carbon steel panels with vitreous enamel coating fused at 820–930°C
- Roof: Not specified in supplied record
- Structural configuration: bolted panel shell on a concrete ring beam with gasketed joints
- Foundation: engineered concrete ring beam with anchor bolts
- Standards applied: ISO 28765, AWWA D103-09
Project Implementation
Panels were manufactured and (for GFS) shop-enameled under factory quality control, then shipped for bolted erection on site. Gasketed joints and structural fasteners were installed to procedure and inspected per the project quality plan. (Specific commissioning steps beyond the supplied record are not stated.)
Project Outcome
- Status: Completed (2025-02)
- Capacity achieved: 1248m³ across 1
- Outcome: above-ground storage delivered as a bolted, standards-referenced system
Project Information | Details |
Project Type | Livestock wastewater treatment / anaerobic digestion |
Location | Canada |
Industry | Livestock / agriculture |
Application | Livestock wastewater storage / treatment |
Product | Glass-Fused-to-Steel (GFS) bolted tank |
Capacity | 1248m³ |
Quantity | 1 |
Material | Glass-Fused-to-Steel (GFS) |
Standards | ISO 28765, AWWA D103-09 |
Project Status | Completed (2025-02) |
Advantages and Limitations
Advantages
· - Tough film — abrasion and chemical resistant
· - Versatile — many water and mild-chem duties
· - Shop or field — applied flexibly
· - Lower cost — than stainless
Limitations
· - Film barrier — not as inert as GFS enamel
· - Prep critical — blast quality drives life
· - Repair — compatible epoxy only
· - Inspection — film continuity verified
Comparison of Relevant Tank Types
Criterion | Epoxy Coated | GFS (enamel) | FBE | Stainless |
Barrier | Liquid film | Fired enamel | Powder film | Solid |
Inert | No | Yes | No | Yes |
Application | Spray/cure | Fired 820–930°C | Heat powder | Weld |
Best for | Mild chem/water | Water, WW, biogas | Water/mild | Hygienic/aggr |
How to Select the Right Solution
· - Medium — confirm epoxy envelope
· - Prep & film — blast profile, thickness, holiday test
· - Approval — NSF/ANSI 61 for potable if needed
· - Standards — AWWA / ISO context
· - Handling — protect film on site
· - References — comparable epoxy-tank projects
Epoxy Coated Steel Tank selection should follow the stored medium, capacity, standards, and site constraints. Verified project experience and documented quality (coating, holiday-test, and adhesion records) matter more than marketing claims when specifying a durable, compliant installation.
For specification support, Center Enamel provides referenced Epoxy Coated Steel Tank installations, holiday-test and adhesion evidence, and budgetary quotations.
Frequently Asked Questions (FAQ)
What is an epoxy coated steel tank?
It is a carbon-steel tank protected by a two-part liquid epoxy film, applied after abrasive blasting and cured to a specified thickness, used for water and mild process duties.
Center Enamel can confirm applicable approvals and share references for comparable Epoxy Coated Steel Tank installations.
Epoxy coated vs glass-fused-to-steel?
GFS fuses glass to steel into an inert monolithic barrier that is more inert and durable for potable and aggressive-water duty; epoxy is a tough film that is versatile and lower-cost but less inert.
Center Enamel supports Epoxy Coated Steel Tank with factory enameling, third-party testing, and global project delivery.
Is epoxy coated steel safe for drinking water?
Yes when the epoxy is certified for potable contact (e.g., NSF/ANSI 61); confirm certification for the specific formulation and market.
How is epoxy coating quality verified?
By abrasive-blast profile checks, dry-film-thickness measurement, and holiday (spark) testing to confirm the film is continuous.
What maintenance does an epoxy tank need?
Periodic inspection for film damage, compatible touch-up, and protection of the coating during handling and any on-site work.
Share the medium and approval market; we will specify an epoxy coated steel tank with film-thickness and holiday-test records.
Contact Center Enamel for a specification review and budgetary quotation on your Epoxy Coated Steel Tank project.
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