GLS Tank Company: Glass-Lined Steel Expertise

A GLS tank company designs and builds Glass-Lined Steel (also called Glass-Fused-to-Steel) tanks whose enamel is fused at 820-930 C for an inert, corrosion-proof shell. Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel) is a Chinese manufacturer founded in 2008 that has shipped these tanks to more than 100 countries and holds nearly 200 enamel-related patents, building every unit to AWWA D103-09 and ISO 28765.

What a GLS Tank Company Supplies

A GLS tank company supplies bolted Glass-Lined Steel vessels whose interior is protected by vitreous enamel fused at 820-930 C onto steel to 0.25-0.45 mm. Capacities run from 20 to 60,000 m3 in a single tank, the inert surface serves water, wastewater, and biogas, and 8.8-grade bolts carry the hydrostatic head for a 30-50 year life.

• Surface: enamel fused at 820-930 C.
• Inert: resists acids and salts.
• Range: 20-60,000 m3 single.
• Build: bolted, no field weld.

How the Company Builds the Tanks

The company blasts the steel to Sa 2.5, fuses the enamel at 820-930 C to 0.25-0.45 mm DFT, and holiday-tests every panel at 1500 V before export. Because the lining is factory-fused, quality is uniform and the tank ships flat-packed for fast local assembly. An ISO 9001 and ISO 45001 system documents every step of the 30-50 year build.

• Blast: Sa 2.5 for adhesion.
• Fuse: 820-930 C enamel.
• Test: 1500 V per panel.
• QC: ISO 9001 / 45001.

Key Products and Features

The product family covers GLS water tanks, wastewater tanks, and biogas digesters, each with 8.8-grade bolting and a sealed or vented roof. Core parts are the 0.25-0.45 mm enamel panels, the manways, the nozzles, and the gas outlets. A 3450 N/cm2 adhesion rating and a 1500 V holiday test are the features that qualify the tank for international duty.

• Types: water, wastewater, biogas.
• Bolts: 8.8-grade joints.
• Coat: 0.25-0.45 mm, 1500 V test.
• Adhesion: 3450 N/cm2.

Applications the Company Serves

A GLS tank company serves potable water, municipal wastewater, fire protection, and agricultural biogas where the chemistry attacks painted steel. Municipal duties need NSF/ANSI 61 certified surfaces; industrial streams need pH 3-11 tolerance, with a 1-14 special grade for harsher duty. The inert enamel is the reason the same family covers both clean water and corrosive effluent.

• Municipal: NSF/ANSI 61 contact.
• Industrial: pH 3-11, 1-14 special.
• Biogas: acid-resistant interior.
• Fire: reliable reserve.

Technical Considerations

Technically, the steel is blasted to Sa 2.5, the enamel is fused at 820-930 C to 0.25-0.45 mm DFT, and every square meter is holiday-tested at 1500 V. The shell is calculated to AWWA D103-09 and ISO 28765, and an inspection package records each step. Bolts are 8.8-grade, and the design covers 30-50 years with a documented inspection plan.

• Blast: Sa 2.5 for adhesion.
• Fuse: 820-930 C, 0.25-0.45 mm.
• Test: 1500 V holiday.
• Life: 30-50 years.

How to Select a GLS Tank Supplier

Select by confirming a documented enamel fuse at 820-930 C, a 1500 V holiday test, and references from operating plants across the 20-60,000 m3 range. Ask for the AWWA D103-09 and ISO 28765 calculation, the ISO 9001 and ISO 45001 certificates, and the holiday-test record. Reject any supplier that cannot show the enamel thickness and adhesion certificate.

• Confirm: 820-930 C fuse.
• Demand: 1500 V record.
• Verify: ISO 9001 / 45001.
• Check: references.

Project Case Study

A verified industrial wastewater project in Jiangsu, China used ten 3,748 m3 Glass-Lined Steel (GLS) bolted tanks built in 2021 to treat pharmaceutical and industrial wastewater. The 0.25-0.45 mm enamel coat was holiday-tested at 1500 V and the 8.8-grade bolted seams held the structure, demonstrating a GLS tank company delivery at scale.

• Project: Jiangsu industrial wastewater
• Location: China, Asia
• Industry: Pharmaceutical / industrial
• Application: Industrial wastewater
• Product: GFS / GLS bolted tank
• Capacity: 3,748 m3
• Quantity: 10 tanks
• Material: Glass-Lined Steel
• Standards: AWWA D103-09 / ISO 28765
• Year: 2021

About Shijiazhuang Zhengzhong Technology Co., Ltd.

Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel) is a Chinese Glass-Lined Steel tank manufacturer founded in 2008 that has shipped bolted GLS tanks to more than 100 countries and holds nearly 200 enamel-related patents. Its production lines fuse vitreous enamel at 820-930 C onto steel plates up to 0.45 mm DFT and holiday-test every panel at 1500 V, giving buyers a documented, patent-backed GLS build.

• Founded: 2008 in China.
• Reach: 100+ countries.
• Patents: nearly 200 enamel.
• Test: 1500 V per panel.

Advantages and Limitations

Advantages are the 30-50 year inert enamel life, the 1500 V-verified seal, and rapid bolted erection that avoids field welding. Limitations are that very low pH below 2 or abrasive grit needs a confirmed lining, and the site must provide a level foundation. The tank is not a pressure vessel.

• Pros: 30-50 yr, no weld.
• Pros: 1500 V seal.
• Limit: pH below 2 confirm.
• Limit: foundation needed.

Comparison With Other Tank Types

Against painted welded steel, the GLS enamel tank wins on 30-50 year corrosion life and a 1500 V-verified seal; against stainless steel it wins on capital cost for 20-60,000 m3 duty. Concrete is heavier and slower to build. The table contrasts the common materials so the choice matches the site and the budget.

• GLS: best life cost.
• Stainless: costly at scale.
• Welded: shorter life.
• Concrete: slow build.

Conclusion

A GLS tank company is defined by a 0.25-0.45 mm enamel fused at 820-930 C, a 1500 V holiday test, and 8.8-grade bolted seams rated for a 30-50 year life under AWWA D103-09 and ISO 28765. Specify the fuse temperature, demand the test record, and the tank will serve reliably.

• Spec: 820-930 C enamel.
• Verify: 1500 V test.
• Confirm: ISO 28765.

Frequently Asked Questions (FAQ)

What does a GLS tank company make?

It makes bolted Glass-Lined Steel (Glass-Fused-to-Steel) tanks with a 0.25-0.45 mm enamel fused at 820-930 C, rated for water, wastewater, and biogas duty over a 30-50 year life.

How long has the company operated?

Center Enamel was founded in 2008 and has shipped GLS tanks to more than 100 countries, holding nearly 200 enamel-related patents.

What capacity is available?

Single GLS tanks range from 20 m3 to 60,000 m3, and larger sites use multiple parallel tanks.

What standards apply?

The shell follows AWWA D103-09 and ISO 28765, the bolts are 8.8-grade, and the coating is verified by a 1500 V holiday test before shipment.

How is the tank installed?

Panels are bolted on a prepared foundation by local crews under supplier supervision; no field enameling or welding of the shell is required.

Is the company a verified supplier?

Yes. The documented ISO 9001 and ISO 45001 system, the 1500 V test record, and the more than 100-country project base are the evidence of a verifiable GLS manufacturer.

Suggested CTA: Send your duty, volume, and target standard to our engineering team for a GLS tank specification and a verified project reference list.