GLS Water Storage Solutions Supplier for Potable and Process Water
Created on 09.02
GLS Water Storage Solutions Supplier for Potable and Process Water
A GLS water storage solutions supplier provides a glass-lined steel tank configured for the water duty rather than sold as a generic vessel. The enamel is fused into the carbon steel panels at 820 to 930 °C, 0.25 to 0.45 mm thick and rated above 3,450 N/cm², with a per panel 1500 V DC spark test, a surface roughness below Ra 0.8 µm, and a potable water contact certification where the project requires it. The same platform covers potable storage, industrial process water, fire reserve and rainwater harvest, all as atmospheric bolted storage with 8.8-grade bolts and EPDM gaskets and a design life of 30 years or more.
Water storage looks like a commodity until the day the water has to meet a standard. A potable tank and a fire reserve tank have the same shape and a very different specification behind them: one needs a lining that cannot migrate anything into the water and a certification to prove it, the other needs availability and a level indication that the authority can audit. Industrial process water sits in between, with a purity and rust concern rather than a compliance one. This is where the value of a solutions supplier over a panel vendor shows up: the vessel, the lining package, the level and isolation details and the document file get configured together for the actual duty.
Matching the tank to the water duty
Four water duties, four specification emphasises. Potable storage needs the drinking water contact certification the project requires, typically NSF/ANSI 61 or WRAS, a sealed interior and a cleanable flange detail; it is atmospheric, and the pump or the gravity outlet sits below the low level. Industrial process water cares about no rust colour and no flaked coating in the line, which a fused enamel interior at Ra below 0.8 µm delivers. Fire reserve cares about availability: locked isolation, a control room level indication, a low level alarm distinct from a low low trip, a testable outflow connection and freeze protection. Rainwater harvesting cares about first flush and sediment, so the inlet arrangement and the bottom drain matter more than the lining chemistry.
That last point generalises: the lining handles corrosion, but the inlet, the outlet elevation and the drain decide whether the stored water stays usable. An inlet that enters above the water line and splashes deposits sediment along the bottom, and an outlet at the lowest point walks the settled layer into the downstream unit. A baffled inlet well and a clear well with a wall is a small drawing addition that changes real performance.
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 | No rust colour, easy washdown |
Spark test | 1500 V DC | Per panel before shipment |
pH tolerance | 1–14 | Wide raw and treated water range |
Potable certification | NSF/ANSI 61, WRAS | Where the project requires it |
Design life | 30 years or more | Atmospheric water 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 site logistics |
Roof options | bolted dome, floating pan, gas tight membrane | Per the process requirement |
What the solution package contains
A complete water storage solution is a drawing package plus a supply package. On the drawing side it is the tank diameter and height, the effective and dead volume breakdown, the inlet and outlet elevations, the overflow and the level control arrangement, the manways and nozzles, the foundation load with the permitted settlement, the ring beam detail, and the roof interface. On the supply side it is the enamelled panels, the bolt set and gaskets, the roof, the level instrumentation and its alarm set points, the isolation valve arrangement, the test connection, the site supervision or assembly crew, the hydrostatic test at atmospheric pressure, and the document file.
For a fire reserve the same package gains the items an audit looks for: a level indication readable from the control room, a low level alarm, a locked isolation so the fire margin is not drained by process demand, an outflow test procedure and a freeze protection method, usually heat trace and insulation rather than a drain. Those are far cheaper on the drawing than in the field.
Sizing and certification
Volume follows from the duty. Potable and process water are sized from the consumption demand plus the service reserve and the cleaning volume; fire reserve from the design area, application density, hose allowance and duration agreed for the occupancy, with NFPA 22 governing the tank and NFPA 20 the pump where the project is in that scope; rainwater from the catchment area and the storage season. In each case the usable volume is the geometric volume less the freeboard, the sediment and the level band, so specify the level range explicitly and test it, rather than assuming the tank holds everything between the overflow and the bottom.
Certification is the part that gets left to the end and causes the delay. Fix the required drinking water contact certification for potable water, the CE and ISO 28765 or EN 1090 references for a European project, and the manufacturing quality system statement, and put all of it in the order with the coating supplier named rather than left to the shop floor.
Project Case
Project | Location | Product | Capacity | Scope |
Large diameter potable water storage | Namibia | GLS water tank | 44,900 m³ | supply + supervision, potable duty |
Fire water tank, two units | Sichuan, China | GLS water tank | 8,930 m³ | supply + supervision, φ19.87 × 14.4 m × 2 |
Municipal effluent tank programme, 10 units | Sichuan, China | GLS water tank | 17,420 m³ | supply, multi-tank site |
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 water storage solutions this covers the duty specific configuration, the potable water contact certification file, the level and fire reserve instrumentation, and the bolted assembly with a small site crew for remote projects.
Frequently Asked Questions
Q1: Does one lining cover potable, process and fire water?
A1: The fused enamel surface does, and it covers pH 1 to 14. What differs is the documentation: potable work needs the drinking water contact certification the project requires, and fire work needs the level, isolation and test details.
Q2: How is the potable certification handled?
A2: By supplying the lining system with NSF/ANSI 61 or WRAS as the project requires, together with the material declarations, the enamel firing record and the per panel spark test record in the same file.
Q3: Is a fire water tank the same vessel as a process water tank?
A3: Structurally yes, it is atmospheric storage. The difference is in the accessories: locked isolation, control room level, low level alarm, a testable outflow and freeze protection.
Q4: How do I size a rainwater tank?
A4: From the catchment area and the rainfall distribution over the storage season, with an allowance for first flush and sediment. Usable volume is geometric volume less freeboard and sediment.
Q5: What is the design life?
A5: Thirty years or more for atmospheric water storage, with the enamel interior free of the internal recoating cycle that a welded carbon tank carries, and attention going to gaskets and bolt torque.
Q6: Can the roof be upgraded later?
A6: Yes. The roof is a separate package on the same rim, so a bolted tank can take a floating pan, an aluminium dome or a gas tight membrane cover as the process needs change.
Q7: What is the largest capacity available?
A7: Single tanks are supplied up to 60,000 m³, so the practical limit is the transport route and the crane at site rather than the factory.
A GLS water storage solutions supplier should configure the vessel, the lining file, the level and isolation details and the roof together for the actual water duty. The fused enamel fired at 820 to 930 °C with a 0.25 to 0.45 mm layer and a 1500 V per panel spark test handles corrosion and protects water quality; the inlet, outlet and drain layout decide whether the stored water stays usable; and the certification and audit details decide whether the tank passes review. Send the duty, the volume, the standard and the site data to the engineering desk and the solution configuration and document package will follow.
Talk to an Engineer
Send the water storage data for a solutions review: the duty, potable, process, fire reserve or rainwater, and the relevant standard, the demand or sizing basis, the required certification, the diameter limits, the site coordinates, soil and foundation condition, crane capacity, transport route and port. We will return the tank diameter and height, the sizing calculation, the lining and certification package, the nozzle and level control layout, the roof option, and the full tender document package. Engineering review first, no obligation.
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