Design Considerations for Glass Fused to Steel Tanks

21, Jul. 2025

 

Design Considerations for Glass Fused to Steel Tanks

What is Glass Fused to Steel?

Glass fused to steel, also known as glass-lined steel, involves fusing a layer of glass to a steel substrate at high temperatures. This process creates a strong bond between the materials, combining the mechanical strength of steel with the chemical resistance of glass.

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Benefits of Glass Fused to Steel Tanks

Glass fused to steel tanks offer numerous advantages:

- Corrosion Resistance: The glass coating provides excellent protection against corrosion.

- Durability: These tanks have a long lifespan due to their robust construction.

- Low Maintenance: The smooth, non-porous surface of the glass coating makes cleaning and maintenance easier.

- Versatility: Suitable for storing a wide range of materials, including potable water, wastewater, and chemicals.

Applications of Glass Fused to Steel Tanks

These tanks are used in various sectors, including:

- Water and Wastewater Treatment: For storing and processing water and wastewater.

- Agriculture: For storing feed, fertilizers, and water.

- Industrial: For holding chemicals, acids, and other industrial materials.

- Fire Protection: For storing water in fire protection systems.

Design Considerations

Material Selection

Selecting the right materials is crucial for ensuring the tank's performance and longevity. The steel must be of high quality, and the glass coating should be chosen based on the chemical nature of the stored contents.

Tank Size and Capacity

Determining the appropriate size and capacity of the tank involves considering the volume of material to be stored, space availability, and future expansion needs. It's essential to calculate the tank's capacity accurately to avoid overloading and ensure efficient storage.

Coating and Protection

The glass coating should be carefully selected based on the tank's application. Different coatings offer varying levels of resistance to chemicals, abrasion, and temperature changes. Ensuring the right thickness and uniformity of the coating is vital to prevent corrosion and leaks.

Structural Integrity

The tank's structural design must account for various stresses, including internal pressure, external environmental factors, and seismic activity. Proper structural design ensures the tank can withstand these forces without compromising its integrity.

Installation Environment

The installation environment plays a significant role in the tank's design. Factors such as temperature, humidity, wind load, and soil conditions must be considered to ensure the tank is adequately supported and protected from environmental damage.

Maintenance and Accessibility

Designing the tank with maintenance and accessibility in mind can significantly reduce long-term costs. Features such as manholes, inspection ports, and ladders facilitate easy access for routine inspections, cleaning, and repairs.

Manufacturing Process

The manufacturing process for glass fused to steel tanks involves several steps:

1. Steel Preparation: Cutting and shaping the steel panels.

2. Cleaning and Blasting: Removing impurities from the steel surface.

3. Glass Coating Application: Applying the glass frit to the steel panels.

4. Firing: Heating the coated panels in a furnace to fuse the glass to the steel.

5. Inspection: Conducting quality checks to ensure the coating is uniform and free from defects.

Standards and Regulations

Adhering to industry standards and regulations is essential for ensuring the safety and reliability of glass fused to steel tanks. Key standards include:

- AWWA D103: Standard for Factory-Coated Bolted Steel Tanks for water storage.

- ISO : Standard for Vitreous and Porcelain Enamels – Design of Bolted Steel Tanks for the Storage or Treatment of Water or Municipal or Industrial Effluents and Sludges.

- NSF/ANSI 61: Certification for drinking water system components.

Frequently Asked Questions (FAQs)

What are the advantages of glass fused to steel tanks?

Glass fused to steel tanks offer excellent corrosion resistance, durability, low maintenance, and versatility, making them suitable for various storage applications.

If you want to learn more, please visit our website Glass-Fused-to-Steel Tank.

How are glass fused to steel tanks made?

The process involves preparing steel panels, applying a glass coating, and firing the coated panels in a furnace to fuse the glass to the steel.

What industries use glass fused to steel tanks?

These tanks are commonly used in water and wastewater treatment, agriculture, industrial chemical storage, and fire protection.

How do you maintain glass fused to steel tanks?

Regular inspections, cleaning, and prompt repairs of any damage are essential for maintaining these tanks. Designing the tank with accessibility features can facilitate maintenance efforts.

Conclusion

Designing glass fused to steel tanks requires careful consideration of various factors, including material selection, coating, structural integrity, and environmental conditions. By adhering to industry standards and employing best practices, these tanks can provide long-lasting, reliable storage solutions for a wide range of applications.

Glass Fused To Steel Bolted Storage Tanks Manufacturer - CST

Glass Fused To Steel Bolted Storage Tanks  – Never Need Painting

Glass-fused-to-steel (porcelain enamel) is a single source strong, integrated porcelain enamel and steel material fused together at over ° F, creating a hard inert, inorganic coating that NEVER needs painting.  CST’s glass-fused-to-steel is the premium technology in the tank market.  The interior of all glass-fused-to-steel tanks feature VITRIUM™ coating technology enhanced with titanium dioxide (Ti02) for the toughest glass available. 

CST’s VITRIUM coating is the world’s leading glass-fused-to-steel process for bolted storage tanks and has been field proven for more than 69 years.  Along with VITRIUM coating, CST now offers EDGECOAT® II, the continuous innovative EDGECOAT technology and the ONLY process in the world that provides optimum glass encapsulation on all (4) sides of the sheet edges.  VITRIUM coating features and benefits include:

  • Tough Ti02 glass formulations provides longer life
  • White interior is easier to inspect than darker coatings
  • Factory certified holiday-free sheets
  • Designed for use in both cold and hot climates
  • Designed, fabricated, shipped and supported within the USA

EDGECOAT II is a result of CST’s commitment to an ongoing product development and improvement program.  This continuous innovative EDGECOAT technology is the ONLY process in the world that provides optimum glass encapsulation on all (4) four sides of the sheet edges.  CST took the best EDGECOAT technology in the world and made it better with EDGECOAT II.

Following Porcelain Enameling Institute guidelines (PEI-101), EDGECOAT II sheets are mechanically rounded to specific radii that provides maximum glass adhesion to steel.  The combination delivers the maximum corrosion resistance of VITRIUM glass coating with the greatest protection on every sheet.

  • Highest quality finish
  • Glass is applied on all (4) sides of the sheet offering the greatest protection
  • No sharp edges on tank sheets, eliminating safety hazards
  • Edges are engineered to ensure optimum radii for each individual gauge of steel providing the maximum and consistent glass edge
  • 5 mils of glass encapsulation on every sheet edge

Download Edgecoat II Technical Data Sheet

VITRIUM is our proprietary titanium Dioxide (TiO2) glassing process applied in a 3-coat, 1-fire (3c1f) process procedure. VITRIUM coating is also produced in a 3-coat, 2-fire (3c2f) process primarily when special colors are requested or thicker layers of glass are required.

The CST proprietary VITRIUM glass-fused-to-steel process provides:

  • Longer tank life
  • Base coat of glass frit containing nickel oxide ensures consistent quality
  • Maximum coating effectiveness without requiring excess coating thickness in order to provide the needed durability at competitive pricing
  • Unique process technologies and voltage testing on all interior side wall sheets provide a factory certified 100% holiday free surface.

The combination of glass quality and glass thickness provide the assurance that over 69 years of experience and over 100,000 structures successfully installed around the world will continue with each and every new structure installed.

Titanium Dioxide (TiO2)

In CST, formerly Engineered Storage Products, launched an R&D project to develop a process for the direct application of our proprietary Titanium Dioxide (TiO2) Glass.  The result is a totally new, patented “3-coat, 1-fire” (3c1f) process for applying TiO2 Glass.

TiO2 is a very common ingredient used by many coating manufacturers for various reasons:

    • It is considered inert and at high level in porcelain enamel, gives unique properties.
    • In the case of the interior VITRIUM coating, with its higher percentage of TiO2 in the final white layer, allows CST to provide an exceptional enamel surface.
    • During firing, the white layer’s higher viscosity has the effect of controlling bubble structure in addition to making the top TiO2 rich layer harder, more chemical resistant and the bubble structure finer.  This high TiO2 content is unique to AQUASTORE® and provides exceptional properties to fit colder conditions common to the North American market.

As a result of using higher amounts of TiO2 in the final white layer, a unique visual marker on the glass known as “VITRIUM threading” becomes apparent.  This is caused by thicker areas of the top white layer interspersed with thinner areas allowing the underlying bluecoat to show through opaquely.  This immediately identifies the coating as VITRIUM.

Manufacturing Excellence

CST’s DeKalb facility is ISO : quality system certified.  Engineers design tanks for a wide range of standards including AWWA D103 Standard for Bolted Steel Water Storage Tanks, AISC, FM codes and NFPA Standard 22.  Additionally, glass coatings meet ANSI/NSF Standard 61 requirements for indirect additives, making AQUASTORE®, HARVESTORE® and SLURRYSTORE® tanks ideal for liquid, feed, manure storage and digesters processes.  Most importantly, extreme pride is taken in craftsmanship for a tank that endures the test of time.

From the automated manufacturing processes through the stage-by-stage inspection and even down to careful inspection of the glass. Our glass-fused-to-steel quality is the best in the industry.  The best proof of the precision of CST’s manufacturing procedures can be seen in the thousands of tank installations around the world.

Glass-Fused-To-Steel Process

Glass-fused-to-steel is the premium technology in the tank market.  The factory-applied silica glass coating on AQUASTORE, HARVESTORE, SLURRYSTORE and NUTRISTORE tanks forms a hard, inert barrier for both the interior and exterior tank surfaces to guard against weather and corrosion.  Glass-fused-to-steel is impermeable to liquids and vapors, controls undercutting caused by corrosion and offers excellent impact and abrasion resistance.  The color won’t fade or chalk and most graffiti can easily be removed.  It NEVER needs painting!

    • Fabricated sheets are grit blasted to a uniform, near-white surface
    • Proprietary formulations of borosilicate, minerals, water and clays are blended into a sprayable slurry called “slip”
    • After inspection, the slurry is fused to the steel sheets at temperatures above 1,500° F to produce the distinctive glossy Aquastore finish
    • The molten glass reacts with the profiled steel surface to form an inert, inorganic chemical and mechanical bond

VITRIUM Coating Glass Finish

New process technology has resulted in the development of CST’s newest glass innovation – VITRIUM coating.  This coating combines the outstanding chemical and physical resistant properties of Titanium Dioxide (TiO2) saturated glass with a highly engineered ultra-fine glass structure surface to create a high-performance glass-fused-to-steel technology.  VITRIUM coating features and benefits include:

  • Tough TiO2 glass formulations provide longer life
  • Electrostatic base coat application ensures consistent quality
  • Maximum coating effectiveness without requiring increased coating thickness
  • Unique process technologies provide factory certified “holiday free” sheets
  • Process efficiencies lead to competitive pricing
  • Ideal for both cold and hot climates

Color Options

AQUASTORE glass coatings are available in standard cobalt blue or four other premium exterior colors.  Forest green, sky blue, desert tan or white premium colors are available at an additional cost. Inquire for custom colors.

History of Glass-Fused-To-Steel

CST (formerly A.O. Smith) first discovered the methodology of controlling corrosion by fusing glass to steel in the s.  The technology was initially used in the brewing and hot water heater industries.  While other uses for glass-fused-to-steel were explored, the first glass-fused-to-steel tank went into service in as a HARVESTORE silo.  This agricultural use to store feed while retaining quality has been widely used for almost 69 years.

In the s, our Municipal and Industrial Division was formed and we subsequently launched AQUASTORE tanks for water, wastewater and other industrial liquid uses.  Since , more than 100,000 AQUASTORE, HARVESTORE, SLURRYSTORE and NUSTRISTORE glass-fused-to-steel tanks have been installed in over 70 countries around the world.

Contact us to discuss your requirements of GFS Tank. Our experienced sales team can help you identify the options that best suit your needs.