Color Storage Tanks: Coated and Color-Coded Options

Color storage tanks are Glass-Fused-to-Steel (GFS) vessels whose vitreous enamel can be produced in selected colors for site identification while keeping a 0.25-0.45 mm layer fused at 820-930 C. Engineered by Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel), every panel is holiday-tested at 1500 V and the shell is built to AWWA D103-09 for a 30-50 year life.

What a Color Storage Tank Is

A color storage tank is a Glass-Fused-to-Steel (GFS) vessel whose 0.25-0.45 mm vitreous enamel is fused at 820-930 C in a selected color so tanks are identified by duty on site. Capacities reach 20-60,000 m3, the 8.8-grade bolted seams are gasketed, and the 30-50 year inert lining is unchanged by the color choice.

• Coat: 0.25-0.45 mm enamel.
• Color: selected ID.
• Fuse: 820-930 C.
• Life: 30-50 years.

How Color Is Applied

The color is part of the vitreous enamel fused at 820-930 C, so it is not a surface paint that peels; the 0.25-0.45 mm layer is verified pinhole-free at 1500 V per panel. Because the enamel is inert, the 30-50 year shell keeps its color and its corrosion resistance, and the 8.8-grade bolted seams with gaskets keep the tank sealed.

• Color: in enamel, not paint.
• Test: 1500 V panel.
• Bolts: 8.8-grade.
• Life: 30-50 years.

Key Types, Components, and Features

The family covers the GFS water tank, the wastewater tank, and the geodesic dome roof, all available in selected enamel colors. Core parts are the colored enamel panels, the 8.8-grade bolt set, the manways, and the nozzles. A 1500 V holiday test and a 6.0 Mohs surface are the features that keep the color tank functional, not just decorative.

• Shell: colored GFS.
• Roof: geodesic option.
• Bolts: 8.8-grade.
• Surface: 6.0 Mohs.

Applications of Color Tanks

They serve multi-tank sites where drinking water, firefighting, and wastewater must be color-coded for safety, and plants that want a corporate or municipal color. A 30-50 year GFS tank keeps its color through sun and weather, which is why utilities and industry adopt color coding. The inert enamel serves any liquid from pH 6.5-8.5.

• Multi-tank: duty ID.
• Safety: color code.
• Brand: corporate color.
• pH: 6.5-8.5.

Technical Considerations

Technically the steel is blasted to Sa 2.5, the colored enamel is fused at 820-930 C to 0.25-0.45 mm DFT, and each panel passes a 1500 V holiday test before shipment. The shell is calculated to AWWA D103-09, the bolt torque is recorded, and the design life runs 30-50 years regardless of color.

• Blast: Sa 2.5.
• Fuse: 820-930 C, 0.25-0.45 mm.
• Test: 1500 V.
• Code: AWWA D103-09.

How to Select a Color Tank

Select by matching the medium, the volume (20-60,000 m3), and the color ID plan to a GFS tank with a documented 1500 V test and 8.8-grade bolts. Ask for the AWWA D103-09 calculation, the enamel certificate, and the reference plants. Confirm that the color is fused enamel, not an added paint.

• Match: medium, volume.
• Confirm: fused color.
• Demand: 1500 V record.
• Verify: AWWA D103-09.

Project Case Study

A verified Glass-Fused-to-Steel (GFS) potable-water project in the Maldives used twenty-three 11,672 m3 bolted tanks built in 2023 to serve many islands with color-coded duty and a 30-50 year inert lining. The 0.25-0.45 mm enamel coat was holiday-tested at 1500 V and the 8.8-grade bolted seams held the structures, demonstrating a large multi-tank color-coded install.

• Project: Maldives potable water
• Location: Maldives, Asia
• Industry: Municipal water
• Application: Drinking water
• Product: GFS bolted tank
• Capacity: 11,672 m3
• Quantity: 23 tanks
• Material: Glass-Fused-to-Steel
• Standards: AWWA D103-09 / ISO 28765
• Year: 2023

About Shijiazhuang Zhengzhong Technology Co., Ltd.

Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel) produces Glass-Fused-to-Steel panels in selected enamel colors from a single line founded in 2008, exporting to more than 100 countries with nearly 200 enamel patents. Its color enamel is fused at 820-930 C and holiday-tested at 1500 V, so the identification color is also the corrosion defense.

• Founded: 2008 in China.
• Color: fused enamel.
• Reach: 100+ countries.
• Test: 1500 V per panel.

Advantages and Limitations

Advantages are permanent color coding without repainting, a 30-50 year inert lining, and fast bolted erection. Limitations are that color is set at the line (lead time), and very low pH below 2 needs a confirmed lining. The tank is not for fuels or solvents.

• Pros: permanent color.
• Pros: 30-50 yr lining.
• Limit: line lead time.
• Limit: pH below 2.

Comparison With Painted Color

Against a painted steel tank, the fused enamel color never peels and lasts 30-50 years versus a 10-15 year repaint. The table contrasts the color options so the buyer sees the lifecycle difference.

• GFS: fused color, 30-50 yr.
• Painted: peels, repaint.
• Stainless: no color.
• Welded: painted only.

Color storage tanks are Glass-Fused-to-Steel vessels with a 0.25-0.45 mm enamel fused at 820-930 C in selected colors, holiday-tested at 1500 V, and built to AWWA D103-09 for a 30-50 year life. Specify the color, verify the fused enamel, and the tank codes itself for its whole life.

• Spec: fused color.
• Verify: 1500 V test.
• Confirm: AWWA D103-09.

Frequently Asked Questions (FAQ)

What is a color storage tank?

It is a Glass-Fused-to-Steel tank whose vitreous enamel is fused at 820-930 C in a selected color for site identification, with a 30-50 year lining and a 1500 V-verified seal.

Does color affect corrosion resistance?

No, the color is part of the same 0.25-0.45 mm enamel that provides corrosion resistance; it is not a separate paint layer.

What capacity is available?

Single GFS tanks range from 20 m3 to 60,000 m3, with large multi-tank sites served by parallel tanks.

What standards apply?

The shell follows AWWA D103-09 and ISO 28765, the coating is verified by a 1500 V holiday test, and the plant is certified to ISO 9001.

How is it installed?

Bolted on a prepared foundation by local crews under supplier supervision, with no interior field welding.

Can I color-code multiple tanks?

Yes, each tank can carry a different fused enamel color for duty identification across a multi-tank site.

Send your medium, volume, and color-coding plan to our engineering team for a GFS tank specification with fused enamel colors and reference plants.