Bolted Steel Tanks from the Factory

A bolted steel tanks factory produces panels in a controlled plant and ships them flat-packed for bolt-up on site, which is why Glass-Fused-to-Steel and Fusion Bonded Epoxy tanks avoid field welding and coating. Engineered by Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel), the enamel is fused at 820-930 C and every panel is holiday-tested at 1500 V before export, building to AWWA D103-09 and ISO 28765 for a 30-50 year life.

What a Bolted Steel Tank Factory Makes

A bolted steel tanks factory makes coated panels whose interior is protected by vitreous enamel fused at 820-930 C (GFS) or epoxy cured at 180-220 C (FBE). Capacities run from 20 to 60,000 m3 in a single tank, the panels bolt together with 8.8-grade fasteners, and the factory build gives a uniform 30-50 year lining rather than a field-applied coat.

• Coat: enamel at 820-930 C.
• Bolts: 8.8-grade joints.
• Range: 20-60,000 m3 single.
• Build: flat-packed, no weld.

How the Factory Build Works

The steel is blasted to Sa 2.5, the enamel is fused at 820-930 C to 0.25-0.45 mm DFT, and each panel is holiday-tested at 1500 V before it leaves the plant. Because the lining is factory-fused, quality is uniform and the tank ships flat-packed for fast local bolt-up. An ISO 9001 system documents the 30-50 year build from plate to panel.

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

Key Products and Features

The product family covers GFS bolted tanks, FBE bolted tanks, and aluminum geodesic dome roofs, each with 8.8-grade bolting and a sealed or vented roof. Core parts are the coated 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: GFS and FBE.
• Bolts: 8.8-grade joints.
• Roof: dome option.
• Adhesion: 3450 N/cm2.

Applications the Factory Serves

A bolted steel tanks factory 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 Bolted Tank Factory

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 certificate, and the holiday-test record. Reject any factory that ships untested panels or cannot show the enamel thickness certificate.

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

Project Case Study

A verified industrial wastewater project in Jiangxi, China used two 10,355 m3 Glass-Fused-to-Steel (GFS) bolted tanks built in 2023 from factory-made panels to treat paper-industry 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 bolted steel tanks factory delivery.

• Project: Jiangxi paper wastewater
• Location: China, Asia
• Industry: Paper / industrial
• Application: Industrial wastewater
• Product: GFS bolted tank
• Capacity: 10,355 m3
• Quantity: 2 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) is a Chinese bolted steel tanks factory founded in 2008 that fuses vitreous enamel at 820-930 C and cures FBE at 180-220 C onto steel plates, shipping flat-packed panels to more than 100 countries. Its lines holiday-test every panel at 1500 V, giving buyers a documented, factory-uniform bolted build.

• Founded: 2008 in China.
• Reach: 100+ countries.
• Fuse: 820-930 C enamel.
• Test: 1500 V per panel.

Advantages and Limitations

Advantages are the 30-50 year factory-fused lining, 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 Welded Tanks

Against welded painted steel, the bolted GFS or FBE tank wins on 30-50 year corrosion life, a 1500 V-verified seal, and factory uniformity; against concrete it wins on speed and weight. The table contrasts bolted and welded construction so the choice matches the duty and the budget.

• Bolted: factory coat, fast.
• Welded: field coat, slower.
• Concrete: slow build.
• Life: 30-50 years.

Conclusion

A bolted steel tanks factory 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 arrive ready to bolt up.

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

Frequently Asked Questions (FAQ)

What does a bolted steel tanks factory make?

It makes flat-packed coated panels for Glass-Fused-to-Steel and Fusion Bonded Epoxy tanks, with enamel fused at 820-930 C or epoxy cured at 180-220 C, rated for a 30-50 year life.

Why bolted instead of welded?

Bolted tanks ship factory-coated panels for fast on-site assembly with no field welding or coating, giving uniform quality and a 30-50 year lining.

What capacity is available?

Single bolted 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 factory a verified supplier?

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

Suggested CTA: Send your duty, volume, and target standard to our engineering team for a factory-built bolted tank specification and a verified reference list.