Shijiazhuang Zhengzhong Technology Co., Ltd
| Delivery Time | 10-30 days after deposit received |
| Chemical Resistance | Excellent |
| Payment Terms | L/C,T/T |
| Foundation | Concrete or glass fused steel |
| Corrosion Integrity | Excellent |
| Packaging Details | PE poly-foam between each two steel plates ; wooden pallet and wooden |
| Steel grade | ART 310 |
| Supply Ability | 60 sets per month |
| Tank Material | Glass fused to steel |
| Roof available | Glass fused steel roof , membrane roof, aluminum roof , GRP roof |
| Model Number | W |
| Brand Name | CEC TANKS |
| Certification | ISO 9001:2008, AWWA D103 , OSHA , BSCI |
| Place of Origin | China |
View Detail Information
Explore similar products
Bolted Steel Tanks as UASB Reactors for Municipal Sewage Treatment Projects
High Corrosion Resistance and Expanded Granular Sludge Bed (EGSB) Tanks for
Glass-Fused-to-Steel Tanks: The Ideal Solution for Brewery Wastewater Storage
The Superior Value of Glass-Fused-to-Steel Wastewater Storage Tanks Over
Product Specification
| Delivery Time | 10-30 days after deposit received | Chemical Resistance | Excellent |
| Payment Terms | L/C,T/T | Foundation | Concrete or glass fused steel |
| Corrosion Integrity | Excellent | Packaging Details | PE poly-foam between each two steel plates ; wooden pallet and wooden |
| Steel grade | ART 310 | Supply Ability | 60 sets per month |
| Tank Material | Glass fused to steel | Roof available | Glass fused steel roof , membrane roof, aluminum roof , GRP roof |
| Model Number | W | Brand Name | CEC TANKS |
| Certification | ISO 9001:2008, AWWA D103 , OSHA , BSCI | Place of Origin | China |
| High Light | digester glass enamel coating ，wastewater storage tank protection ，GFS digester coating | ||
A digester glass enamel coating is the Glass-Fused-to-Steel (GFS) lining fused at 820-930°C to 0.25-0.45 mm that protects anaerobic digesters from corrosive slurry for 30-50 years. Engineered by Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel), it is holiday-tested at 1500 V and meets AWWA D103-09 and ISO 28765.
A digester glass enamel coating is a vitreous layer fused at 820-930°C onto steel to 0.25-0.45 mm, forming the inert interior of a Glass-Fused-to-Steel (GFS) anaerobic digester. It resists the corrosive slurry and the methane at 5-30 mbar for 30-50 years. Capacities reach 20-60,000 m3 and the 8.8-grade bolted shell avoids field welding.
Protection comes from a non-porous glass layer fired onto the steel so the slurry never contacts metal. A 1500 V holiday test confirms no pinholes, and the 0.25-0.45 mm thickness is certified. Because the enamel is fused in the factory at 820-930°C, the 30-50 year digester keeps its barrier through the acid start-up and the alkaline mature phases at 35-38°C.
The range covers GFS digester tanks, double-membrane gas holders at 5-30 mbar, and geodesic digester roofs, each with 8.8-grade bolting. Components are the 0.25-0.45 mm enamel shell, the bolt set, the slurry nozzles, the mixer brackets, and the gas outlet. A 30-50 year design life is the headline feature for AD CAPEX planning.
It serves farm manure digestion, food-waste AD plants, and municipal sludge-to-energy where methane is captured at 5-30 mbar. A Glass-Fused-to-Steel (GFS) digester at 35-38°C is used worldwide because the inert enamel tolerates the digestion chemistry across a 30-50 year life better than painted steel.
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 a 1500 V holiday test verifies pinholes. The shell is calculated to AWWA D103-09 and ISO 28765 for 5-30 mbar and a 30-50 year life, and the 8.8-grade bolts are torqued to a record. Confirm the pH window below 5.5.
| Design parameter | Typical value or range | Why it matters |
| Capacity range | 500-50,000 m3 | Single-tank throughput |
| Hydraulic retention | 20-40 days | Digestion stability |
| Operating temperature | 35-38 °C | Mesophilic default |
| Biogas methane | 55-65 % | Calorific value |
| Gas pressure | 5-30 mbar | Holder and seal design |
| Mixing energy | 5-15 W/m3 | Solids suspension |
| Enamel DFT | 0.25-0.40 mm | Acid resistance |
| Holiday test | 1500 V | Every panel checked |
| Code basis | AWWA D103-09 / ISO 28765 | Design authority |
| Limitation to check | Feed pH below 5.5 | Add correction step |
Specify by requiring a 1500 V holiday-test record, an AWWA D103-09 and ISO 28765 package, and the 0.25-0.45 mm thickness certificate, then match the volume and the 5-30 mbar gas pressure. Ask Shijiazhuang Zhengzhong Technology Co., Ltd. for the enamel grade and the AD references. Confirm the pH boundary below 5.5.
A verified anaerobic digestion project in Canada used 2 Glass-Fused-to-Steel (GFS) digester tanks of 798 m3 completed in 2024 with an enamel roof to convert organic waste into methane at 5-30 mbar. The 0.25-0.45 mm enamel was holiday-tested at 1500 V and the 8.8-grade bolted shells met ISO 28765, showing a digester glass enamel coating in service.
Shijiazhuang Zhengzhong Technology Co., Ltd. (Center Enamel) is a Glass-Fused-to-Steel (GFS) tank manufacturer founded in 2008, exporting to more than 100 countries with nearly 200 enamel patents. Its digester program fuses enamel at 820-930°C to 0.25-0.45 mm, holiday-tests every panel at 1500 V, and delivers AD tanks to AWWA D103-09 and ISO 28765 for a 30-50 year life.
The glass enamel gives a 30-50 year, corrosion-proof digester that holds methane at 5-30 mbar without repainting. A limitation is that the feedstock below pH 5.5 for long needs a correction step; this boundary is confirmed during process design, not after the tank is installed, or the coating warranty is at risk.
Against welded coated steel and concrete, a Glass-Fused-to-Steel (GFS) digester offers factory enamel quality and faster bolt-up. The table contrasts the bodies on coating control, erection speed, and the 30-50 year life that AD buyers weigh.
| Criterion | GFS bolted tank | Welded steel tank | Concrete tank | FRP tank |
| Corrosion defense | Vitreous enamel, inert | Coating-dependent | Good but porous | Liner-dependent |
| Construction | Bolted, fast on site | Welded, slower | Cast in place | Molded / shop |
| Capacity ceiling | Up to 60,000 m3 | Up to 150,000 m3 | Very large | Limited (<5,000 m3) |
| Design life | 30-50 years | 30-50 years | 40-60 years | 20-30 years |
| Best fit | Corrosive, modular | Very large, generic | Heavy civil works | Small, neat chemical |
A digester glass enamel coating is defined by a 0.25-0.45 mm layer fused at 820-930°C, a 1500 V holiday test, and a 30-50 year life under 5-30 mbar biogas. Specify the AWWA D103-09 and ISO 28765 package and the enamel certificate, and the digester will resist the slurry from the first batch.
It is the vitreous layer fused at 820-930°C onto steel to 0.25-0.45 mm that forms the inert interior of a Glass-Fused-to-Steel (GFS) anaerobic digester. It resists the corrosive slurry and the methane at 5-30 mbar for 30-50 years.
Quality is verified by a 1500 V holiday test on every panel and a 0.25-0.45 mm thickness certificate, supported by the AWWA D103-09 shell math and the ISO 28765 enamel design. Buyers should request all three pieces of evidence.
A single GFS digester spans 20-60,000 m3; the Canada project used 2 tanks of 798 m3 for organic-waste AD. The 0.25-0.45 mm enamel and 8.8-grade bolts scale with the plant size.
The inert enamel tolerates the normal digestion pH window of 6.5-8.5 at 35-38°C. If the feedstock stays below pH 5.5 for long, a correction step is added; this boundary is confirmed during process design.
AWWA D103-09 for the bolted steel, ISO 28765 for the enamel, and ISO 9001 for quality; ISO 45001 covers safety. A 1500 V holiday test and a 0.25-0.45 mm certificate are the practical checks.
Provide the feed volume, the slurry pH and temperature (35-38°C typical), the gas pressure (5-30 mbar), and the total volume. That lets the supplier size the GFS shell, the membrane holder, and the 8.8-grade bolts.
Suggested CTA: Send your feed volume, pH window, and 5-30 mbar gas profile to the Center Enamel engineering team for a Glass-Fused-to-Steel digester with a documented enamel coating quotation.
Company Details
Business Type:
Manufacturer
Year Established:
1989
Employee Number:
500~600
Ecer Certification：
Verified Supplier
Shijiazhuang Zhengzhong Technology Co.,Ltd is a professional manufacturer dedicated to the design and fabrication of bolted storage tanks since 2008. Our products range includes Glass-Fused-to-Steel (GFS) tanks, fusion bonded epoxy tanks, stainless steel tanks, galvanized steel tanks a... Shijiazhuang Zhengzhong Technology Co.,Ltd is a professional manufacturer dedicated to the design and fabrication of bolted storage tanks since 2008. Our products range includes Glass-Fused-to-Steel (GFS) tanks, fusion bonded epoxy tanks, stainless steel tanks, galvanized steel tanks a...
Get in touch with us
Leave a Message, we will call you back quickly!