Which Company Manufactures Bolted Tanks for Water and Wastewater Duty
Created on 07.27
Which Company Manufactures Bolted Tanks for Water and Wastewater Duty
Bolted tanks are manufactured by factories that fuse or coat steel panels in a controlled shop and then ship them for field assembly with gasketed flanges and 8.8-grade bolts. The supplier you want is the one that can show a per-panel test record, an approval matching the gasket to the fluid, and a field supervisor through the final leak check, plus a foundation calculation matched to the soil report. Center Enamel (Shijiazhuang Zhengzhong Technology Co., Ltd) has built bolted storage tanks since 2008 and supplies glass-fused-to-steel, epoxy, galvanized and stainless designs to more than 100 countries.
The inquiry asks who manufactures bolted tanks, and the answer that matters is not a company name but a manufacturing model. A bolted tank is assembled from shop-built panels bolted together at the site, which means quality is decided in a factory and then proved by a crew in the field. That splits the responsibility between the manufacturer and the erector, and it is where most procurement mistakes happen, because a cheap tank with no supervision is a tank with no record. What follows is the practical way to ask which company manufactures bolted tanks for water and wastewater service, and the documents that separate a real bolted tank manufacturer from a trader buying panels in from somewhere else.
What Bolted Manufacturing Actually Involves
A bolted tank is a factory product delivered as a kit, and the factory is the risk. Panels are cut, formed, coated and tested in a shop under controlled temperature and humidity, then shipped as flat or nested stacks and assembled on site into rings around a centre column or a temporary mast. Because the shell is not welded in place, the corrosion protection has to be applied before delivery, which is exactly what glass-fused-to-steel does: each panel is enameled and fused at 820 to 930 °C, the enamel layer runs 0.25 to 0.45 mm and is rated above 3,450 N/cm², and every panel is spark tested at 1500 V DC before it leaves. Panel traceability from furnace log to erected panel is the backbone of the whole system, so ask for it as a matter of course.
Four Product Lines Under One Bolted Shell
The bolted shell is a platform; the interior defines the application. Glass-fused-to-steel is the default for drinking water, municipal and industrial wastewater, agricultural water and anaerobic digestion, with an inert surface over the pH 1 to 14 range and a finish of Ra below 0.8 µm that satisfies NSF/ANSI 61, WRAS, FDA and LFGB where required. Fusion-bonded epoxy powder, applied at 180 to 280 µm and cured at high temperature with a salt spray result beyond 4,000 hours under AWWA C550, serves mildly corrosive process streams and chemical service. Hot-dip galvanized panels to GB/T 13912-2020 give an economical answer for clean water and dry bulk. Stainless 304 or 316L panels cover high chloride and high purity duties. A supplier who can only sell one of these is steering you, so list your fluid first and let the interior follow.
Certifications and the Documents to Require
Approvals are worth having only when mapped onto parts of the tank. NSF/ANSI 61 and WRAS for potable lining and gasket, FDA and LFGB for food contact, CE (EN 1090) and ISO 28765 for the structural steel conformity and factory production control, FM for fire reserve water, and BSCI for social compliance, with ISO 9001 and ISO 45001 for the management systems. Beyond the certificate list, the documents that predict a good installation are a panel schedule with the serial numbers, the furnace and fusion log, the per-panel spark test record, the coating data sheet, the gasket material approval, the foundation load calculation, the erection method statement and the torque record from the field.
How Field Assembly Is Supervised
The last ten percent of the quality lives on site. A competent manufacturer sends a supervisor who checks each flange for gasket seating, verifies the bolt torque in a log at the flanges and at the column, watches for panel damage during unloading and storage, and stays for the final interior inspection and leak check. Foundation work is where bolted projects change character: panels are heavy and dimensionally fixed, so the ring beam has to be true, the anchors placed exactly, and the settlement difference controlled, or you will force a flange open at the top ring. If the supplier considers the tank delivered at the gate, that assumption needs correcting in the contract.
Technical Specification
Parameter | Typical Value / Range | Note |
Enamel fusion temperature | 820–930 °C | Single-pass fusion to the steel panel |
Enamel coating thickness | 0.25–0.45 mm | Inert barrier, pH 1–14 |
Enamel layer strength | ≥ 3,450 N/cm² | Bending and impact resistance |
Spark test voltage | 1500 V DC | Per panel, before shipment |
Surface roughness | Ra < 0.8 µm | Potable and food contact finish |
FBE epoxy film thickness | 180–280 µm | AWWA C550 interior alternative |
FBE salt spray resistance | > 4,000 h | Durability evidence |
Bolt grade | 8.8 | Torque recorded at assembly |
Writing an Inquiry That Produces Real Answers
Send the same brief to at least three manufacturers and require the same reply format. Give the fluid with pH, temperature and chloride content, the capacity in cubic metres and any diameter limit, the site wind snow and frost data, whether the water is potable or fire reserve, the soil conditions if known, the delivery window and the site access constraints such as gate width and crane availability. Then require each bidder to state the panel manufacturing and test regime, the interior recommendation with its approval, the foundation responsibility, the supervision hours included, and the warranty terms. The replies will differ, and the differences are the answer.
Project Case
Project | Location | Product | Capacity | Scope |
Large-diameter water storage | Namibia | GFS tank | 44,900 m³ | supply + supervision |
Fire reserve water | Sichuan, China | GFS tank, 2 units | 8,930 m³ | supply + installation guidance |
Municipal water storage | Malaysia | GFS tank | 20,380 m³ | supply + supervision |
Center Enamel Engineering Capability
Center Enamel (Shijiazhuang Zhengzhong Technology Co., Ltd) has designed and fabricated bolted storage tanks since 2008. As the first glass-fused-to-steel (GFS) tank manufacturer in China, the company holds close to 200 enamel-related patents, produces roughly 300,000 enamel-coated steel plates a year, has completed more than 30,000 installed projects and supplies its tanks to over 100 countries. The new 150,000 m² production base was added to raise output capacity, and single tanks are supplied up to 60,000 m³. Manufacturing runs under ISO 9001 and ISO 45001, with product certification including NSF/ANSI 61, WRAS, FDA, LFGB, CE (EN 1090), ISO 28765, FM, BSCI and EUROCODE, and design referenced to AWWA D103-09, AWWA C550 and NFPA where the application requires it.
For bolted tank supply this covers all four interior families above, panel traceability from furnace log to erected panel, the foundation input and the on-site supervision through the final leak check.
Frequently Asked Questions
Q1: What is the difference between a bolted tank and a welded tank?
A1: A welded tank is built from plate field or shop welded, so the corrosion protection is applied to the finished shell and repair is a cutting and welding job. A bolted tank arrives as pre-fused or pre-coated panels joined with gasketed flanges, so protection is factory applied and any panel can be locally replaced.
Q2: Is a bolted tank leak tight?
A2: Yes, when assembled correctly. Every flange is gasketed, commonly with EPDM or a fluid-specific compound, and each enamel panel is spark tested at 1500 V DC before shipment. The leak paths that matter in service are gasket seating and flange alignment, which is why field supervision is part of the scope.
Q3: Can a bolted tank be taken apart and moved?
A3: That is one of its real advantages. Panels and bolts are reusable, so a temporary site or a phased plant can be dismantled, moved and rebuilt, which is rarely economic for a welded tank.
Q4: Does a bolted tank handle deep drops or high filling rates?
A4: Within reason, yes. The shell is designed for the hydrostatic head of the specified filling range and for the wind and seismic cases of the site. Extreme deep drop conditions should be checked with the supplier for the gasket and interior selection.
Q5: How long does a bolted tank last?
A5: Thirty years or more is the design expectation with a correct interior system and an agreed inspection interval, provided the gasket material matches the fluid and the cathodic approach is discussed at design stage.
Q6: What information do I need to send for a proper quotation?
A6: The fluid and its pH, temperature and chloride content, the capacity and diameter limits, the potable or fire service requirement, site wind snow and soil data, the delivery window and the site access limits. That is enough for a real option, not a ballpark.
A bolted tank is fundamentally a manufacturing question, and the right manufacturer can prove the process with a furnace log, a per-panel spark test record and an approval tied to the gasket. The bolted shell then has to sit on a true ring beam and be assembled under supervision, which is why the contract should name the field supervisor and the final check. Put the fluid and the site data into the inquiry first, require the same document set from every bidder, and the choice of manufacturer becomes obvious from the replies.
Talk to an Engineer
Send us the fluid with pH, temperature and chloride content, the required capacity and any diameter limit, the potable or fire reserve requirement, the site wind snow and soil data, and the delivery window. You will receive an interior recommendation, the applicable approval list, a capacity option with the foundation input we need, and the full drawing and certification package.
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