GLS Tank Supplier for Glass Lined Steel Storage and Process Tanks
Created on 09.04
GLS Tank Supplier for Glass Lined Steel Storage and Process Tanks
A GLS tank supplier delivers a glass-lined steel tank as a complete package: enamelled panels fired at 820 to 930 °C with a 0.25 to 0.45 mm layer rated above 3,450 N/cm², per panel 1500 V DC spark test records, a bolt set and gaskets, the roof, nozzles and manways, the foundation loads, the assembly or supervision crew, and the export document pack. The vessel is atmospheric storage, the enamel covers pH 1 to 14, and the design life is 30 years or more. Single tanks are supplied up to 60,000 m³, and bolted panels ship in containers or breakbulk for long inland hauls.
The word supplier carries a wider range of responsibilities than manufacturer in a tank project. The manufacturer owns the furnace and the panel; the supplier owns the vessel as it will be operated, which includes the shipping route to a site that may be a thousand kilometres inland, the bolt and gasket set that has to arrive with the panels, the roof that has to seal, and the documents that have to clear customs and the engineer. When a procurement team evaluates a GLS tank supplier for an overseas project, the failure they are most worried about is a container arriving without a gasket set or without the spark test record, and the project sitting idle for three weeks. This article covers what a complete supply looks like and what to put in the contract.
What a complete supply includes
The vessel is more than the panels. A complete glass-lined steel supply covers the enamelled panels and the roof, the 8.8-grade bolt set and the EPDM gaskets with the correct quantity and identification, the manways and nozzles with their flanges, the internal ladder or the access hatch, the rim and roof interface for the cover system, the foundation load drawing with the permitted settlement value, the assembly and torque procedure, the site supervision or assembly crew, the hydrostatic test at atmospheric pressure, and the document pack. Leaving any of those out produces a well made tank that cannot be commissioned.
The panel itself is the part people check and the rest is the part that gets forgotten. A panel is fired at 820 to 930 °C, carries an enamel layer of 0.25 to 0.45 mm rated above 3,450 N/cm², and comes out rougher-free at Ra below 0.8 µm with a per panel 1500 V DC spark test result. Every panel is numbered so that the packing list, the spark test record and the site assembly sequence all match.
Technical Specification
Parameter | Typical Value / Range | Note |
Enamel firing temperature | 820–930 °C | Glass fused into the steel panel |
Enamel layer thickness | 0.25–0.45 mm | Rated above 3,450 N/cm² |
Surface roughness | Ra < 0.8 µm | Potable and food contact capable |
Spark test | 1500 V DC | Per panel before shipment |
pH tolerance | 1–14 | Wide chemistry envelope |
Design life | 30 years or more | Atmospheric storage |
Panel width and bolts | ~1.2 m panels, 8.8-grade bolts | EPDM gasket flange joints |
Single tank capacity | up to 60,000 m³ | Diameter driven by route and crane |
Roof options | bolted, dome, floating pan, gas tight membrane | Per the process requirement |
Export documents | packing list, MT, spark test record, certificates | Per the project requirement |
Working with an overseas supply
Three logistics facts decide the diameter. The first is the shipping mode: panels travel as containers or as breakbulk, and both have envelope limits that translate directly into a maximum panel width and therefore a maximum tank segment. The second is the inland route, because a long haul may pass mountain passes, ferry crossings or bridge restrictions that a larger diameter cannot accept. The third is the crane at site, which sets the weight of the largest single lift and therefore the ring lift plan. Fix all three before the diameter is confirmed, not after the drawings are issued.
The commercial side of an overseas supply needs the same attention. Agree the Incoterm, who handles the customs documentation, which certifications the destination requires for import, whether the bolts and gaskets ship with the panels or separately, and whether the roof and the cover ship as a separate consignment. Confirm who provides the site supervision crew and on what basis, and where the spare gasket, bolt and manway sets are held for the first five years of operation.
Documents that clear both customs and the engineer
Ask for one list and measure the supplier against it. The packing list reconciled to panel numbers, the material test report for the steel panels, the enamel schedule with the firing temperature and the layer thickness, the per panel 1500 V DC spark test record, the coating or dimensional inspection record, the gasket and bolt material certificates, the assembled tank drawing with the final diameter and height, the foundation drawing with the loads and the permitted settlement, the anchor bolt setting drawing, the assembly and bolt torque procedure, the coating repair procedure, the product certification the project requires such as NSF/ANSI 61 or WRAS for water or CE to EN 1090 and ISO 28765 for European work, and the quality system statement for the shop under ISO 9001 with ISO 45001. Where the application requires it, the design is referenced to AWWA D103-09, AWWA C550 and NFPA.
Project Case
Project | Location | Product | Capacity | Scope |
Large diameter potable water storage | Namibia | GLS tank | 44,900 m³ | supply + supervision, export shipment and site assembly |
Fire water tank, two units | Sichuan, China | GLS tank | 8,930 m³ | supply + supervision, φ19.87 × 14.4 m × 2 |
Industrial effluent tank programme, 27 units | Xinjiang, China | GLS tank | 30,469 m³ | supply + supervision, phased multi-tank delivery |
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 overseas supply this covers the export document pack, the container or breakbulk shipping plan, the bolt and gasket set with the panels, the site supervision crew, and the spare parts supply for the first years of operation.
Frequently Asked Questions
Q1: What is the difference between a manufacturer and a supplier for a tank?
A1: The manufacturer owns the furnace and the panels. The supplier owns the vessel as delivered, which includes the gaskets and bolts, the roof and nozzles, the shipping plan, the site crew and the document pack.
Q2: Do the gaskets and bolts ship with the panels?
A2: They should, identified and packed separately with the panel numbers they belong to. Agree this in the contract, because a missing gasket set is a three week delay on site.
Q3: How is a large diameter shipped?
A3: As panels in containers or as breakbulk, to the destination port and then overland. Confirm the route and the crane before fixing the diameter.
Q4: What documents does a customs and engineer review need?
A4: Packing list, material test report, enamel schedule, per panel spark test record, gasket and bolt certificates, dimensional and foundation drawings, torque procedure, and the product certification the project requires.
Q5: Can the supplier provide the site crew?
A5: Yes, as a supervised assembly crew or as a supervision visit with your own crew. The basis, the duration and the scope belong in the order.
Q6: What is the lead time?
A6: It depends on the furnace queue, the panel count and the shipping method. Get the furnace booking date and the weekly production plan in writing at tender stage.
Q7: Are spare parts available later?
A7: Gaskets, bolts, manways and roof panels are standard items keyed to the panel numbering, so the supplier can ship a spare set years later for a tank that is still in service.
A GLS tank supplier is judged on the completeness of the package and the reliability of the paperwork as much as on the panels. The glass is fused at 820 to 930 °C, the layer is 0.25 to 0.45 mm rated above 3,450 N/cm², and every panel carries a 1500 V DC spark test record; the rest of the job is the bolt and gasket set, the roof, the shipping plan, the site crew and the export file. Fix all of it in the order and the tank goes into service on schedule and stays there for thirty years or more. Send the capacity, the fluid, the port and the site data to the engineering desk and the supply scope and document package will follow.
Talk to an Engineer
Send the supply data for a review: required capacity, stored fluid with its pH range, potable or process grade and required certification, the destination port and inland route, crane capacity at site, soil and foundation condition, the project deadline, and whether you need the supplier's assembly crew or supervision only. We will return the tank diameter and height, the panel count and production sequence, the shipping method, the bolt and gasket packing plan, the document pack, and the full tender submission. Engineering review first, no obligation.
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