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HDG Water Tank | Galvanized Panel Water Tank Factory
Hot-dip galvanized water tanks feature Q235 steel panels, 80μm+ zinc coating, and bolted modular design.
Durable, corrosion-resistant, and easy to install, they are ideal for building water supply, fire protection, industrial, and domestic water storage applications.
Key Points Tag :
What is a HDG Water Tank?
A Hot-Dip Galvanized Water Tank, also known as an HDG Water Tank, is a new type of modular steel water storage tank. It is one of the three major types of modular sectional water tanks, alongside stainless steel water tanks and FRP/GRP water tanks.
The tank is manufactured using Q235 carbon steel panels. Standard panel sizes include 1220×1220mm (4ft×4ft), 1000×1000mm, 1000×500mm, and 500×500mm. Before delivery, bolt holes are precisely drilled around the edges of each panel. During installation, silicone sealing strips are placed between the panels, and the panels are tightly connected with bolts to ensure a reliable, leak-proof structure.
The steel panels undergo a hot-dip galvanizing process, forming a zinc coating of more than 80 microns (μm) on the surface. This protective layer effectively prevents corrosion, improves weather resistance, and significantly extends the service life of the steel tank.
With advantages such as strong structural stability, flexible installation, and cost-effectiveness, hot-dip galvanized water tanks are widely used for:
- Building water supply
- Fire protection water storage
- Industrial circulating water
- Domestic water storage
- Municipal and engineering projects
Hot-Dip Galvanized Sectional Water Tank
Featuring a modular square panel design, the tank capacity can be customized according to project requirements. The bolt-connected structure allows for easy installation without the need for large lifting equipment.
Fire Fighting & Emergency Water Tank
Hot-dip galvanized water tanks are widely used for fire protection water storage, emergency water supply in modern civil defense projects, and backup water sources for large buildings.
Elevated Water Storage Tank
Hot-dip galvanized water tanks combined with steel tower structures are widely used in Africa and other regions with unstable power and water supplies, providing reliable elevated water storage and gravity-fed water distribution solutions.
HDG water tanks can also be combined with stainless steel, FRP/GRP, insulation materials, and composite materials to form advanced composite structures such as BDF and GSC water tanks, making them suitable for underground installation, cold climates, and other demanding applications.
Reference for Matching Water Tank Panel Thickness and Height Values
| Height | Bottom Board | 1st Layer | 2nd Layer | 3rd Layer | 4th Layer | 5th Layer | Top board |
|---|---|---|---|---|---|---|---|
| 5000 mm | 5 mm | 5 mm | 5 mm | 4 mm | 3 mm | 2.5 mm | 2 mm |
| 4500 mm | 5 mm | 5 mm | 5 mm | 4 mm | 3 mm | 2.5 mm | 2 mm |
| 4000 mm | 5 mm | 5 mm | 4 mm | 3 mm | 2.5 mm | 2 mm | |
| 3500 mm | 4 mm | 4 mm | 3 mm | 3 mm | 2.5 mm | 2 mm | |
| 3000 mm | 4 mm | 4 mm | 3 mm | 3 mm | 2 mm | ||
| 2500 mm | 4 mm | 4 mm | 3 mm | 3 mm | 2 mm | ||
| 2000 mm | 3 mm | 3 mm | 3 mm | 2 mm | |||
| 1500 mm | 3 mm | 3 mm | 3 mm | 2 mm | |||
| 1000 mm | 3 mm | 3 mm | 2 mm |
Modular Panel Standard
We offer a variety of panel sizes:
| Item | 2 mm | 2.5 mm | 3 mm | 4 mm | 5 mm |
|---|---|---|---|---|---|
| 500 x 500 mm | 5.3 kg | 6.9 kg | 8 kg | 11 kg | 13.9 kg |
| 500 x 1000 mm | 9.5 kg | 12.5 kg | 14.6 kg | 19.9 kg | 25.2 kg |
| 1000 x 1000 mm | 17.4 kg | 22.7 kg | 26.6 kg | 36.2 kg | 46 kg |
| 1220 x 1220 mm | # | 33.6 kg | 39.3 kg | 53.7 kg | 68 kg |
Among them, the 1220 × 1220 mm (4ft × 4ft) panel is our main product, supplied globally on a stable basis. It is especially popular in Southeast Asia, India, the Middle East, South America, and Africa.
The above weights are for reference only. Actual weights may vary slightly.
4ft × 4ft International Standard Module
Unlike non-standard tank systems, our product is designed based on the globally recognized 4ft × 4ft modular grid system:
- Standard panel size: 1220 × 1220 mm (4ft × 4ft)
- Compatible with international engineering design standards
- Optimized for container loading and shipping efficiency
- Reduces on-site labor and installation cost
- Improves construction efficiency
👉 Especially suitable for projects in the USA, Canada, Australia, the Middle East, and Africa.
Panel Reinforcement Rib Shape
Type1: Basic Panel
Type2 : Star Panel
Type3 : Star Reinforced Panel
Material and Galvanized Layer Quality Inspection
| Test Item | Technical Requirement | Test Result |
| Steel Plate Base Material | Q235B high-quality carbon structural steel | Qualified |
| Zinc Ingot Purity | Zinc content ≥99.995% | 99.996% |
| Welding Material | ER50-6 welding wire, conforming to GB/T 8110 standard | ER50-6 welding wire, intact package, surface free from rust and oil contamination |
| Sealing Gasket Material | Ethylene Propylene Diene Monomer (EPDM) | No odor, good elasticity |
| Bolt and Fastener Material | SUS304 stainless steel or hot-dip galvanized treatment, tensile strength ≥500MPa | SUS304 stainless steel, tensile strength 615MPa |
| Galvanizing Process | Hot-dip galvanizing | Hot-dip galvanized, smooth surface, no missed coating |
| Average Zinc Coating Thickness | ≥80μm (or ≥85μm) | 92μm |
| Minimum Local Zinc Coating Thickness | ≥70μm | 78μm |
| Zinc Coating Weight | ≥573.5g/m² | 578.6g/m² |
| Zinc Coating Uniformity | No iron exposure after 5 times copper sulfate test | No copper deposition and no exposed iron substrate after 5 immersions |
| Zinc Coating Adhesion | Cross-cut test grade ≥4B | 5B, smooth cutting edges without peeling |
| Salt Spray Resistance | No red rust after NSS salt spray test ≥96 hours | 240 hours continuous test, no red rust, only slight white rust |
Strength and Mechanical Property Inspection
| Test Item | Technical Requirement | Test Result |
| Yield Strength(ReH) | ≥235MPa | 265MPa |
| Tensile Strength(RM) | 370-500MPa | 415MPa |
| Elongation After Fracture | ≥20% | 29.5% |
| Cold Bending Performance | 180° bending, no cracks on outer surface | No visible cracks on tensile surface and edges after 180° bending |
| Hardness Test | HBW≤150 | HBW135 |
| Full Water Structural Deformation | Maximum deflection of tank wall ＜L/500 | Maximum deflection 2.1mm, standard limit 4.0mm |
Safety Immersion Test
| Test Item | Technical Requirement | Test Result |
| Color | Increment ≤5 degrees | ＜5 degrees |
| Turbidity | Increment ≤0.2NTU | 0.15NTU |
| Odor and Taste | No abnormal odor or taste after immersion | None |
| Visible Matter | Shall not contain | None |
| pH Value | Variation ≤0.5 | 0.15 |
| Oxygen Consumption | Increment ≤1mg/L | 0.65mg/L |
| Volatile Phenols | Increment ≤0.002mg/L | ＜0.002mg/L |
| Total Dissolved Solids | Increment ≤10mg/L | 188mg/L |
| Chromium(Hexavalent) | Increment ≤0.005mg/L | ＜0.004mg/L |
| Mercury | Increment ≤0.001mg/L | ＜0.0002mg/L |
| Aluminum | Increment ≤0.02mg/L | ＜0.001mg/L |
| Manganese | Increment ≤0.02mg/L | 0.0003mg/L |
| Iron | Increment ≤0.06mg/L | 0.015mg/L |
| Nickel | Increment ≤0.002mg/L | 0.0005mg/L |
| Copper | Increment ≤0.2mg/L | 0.004mg/L |
Leakage and Sealing Performance Inspection
| Test Item | Technical Requirement | Test Result |
| Full Water Leakage Test | Fill the tank with water and keep it for ≥2 hours, no leakage shall occur on the tank body and connections | Filled with water and kept for 24 hours, no water level drop, no leakage on tank body and connections |
| Flange Connection Sealing | No leakage under 1.5 times working pressure | Pressurized to 0.9MPa and maintained for 30 minutes, no leakage at joints |
| Weld Non-destructive Testing | No defects such as pores, slag inclusion and lack of fusion shall be found in sampled welds | 20 welds inspected by ultrasonic testing, internal quality meets Grade I requirements |
Water Tank Accessories
Internal Accessories
Horizontal Tie Rod
Enhances the structural stability of the water tank with a galvanized coating thickness of ≥100 μm.
Vertical Support
Provides support for the top, bottom, and horizontal bracing of the water tank.
Tie Rod Connection Plate
Welded to both ends of the horizontal tie rod and bolted to the tank side panels.
Rubber Sealing Strip
Food-grade sealing rubber installed between the tank panels to prevent leakage.
Leak Sealing Plug
Silicone or rubber corner blocks with stainless steel bolts to seal the internal tank corners.
Internal Ladder
Provides access to the inside of the water tank for installation and maintenance.
The complete tank structure consists of hot-dip galvanized steel panels, internal support structures, sealing materials, bolt fasteners, pipe connections, ladders, and other accessories. The tank panels are manufactured according to standardized processes in the factory and transported to the project site for modular assembly based on the required dimensions. This design offers convenient transportation, flexible installation, and shorter construction periods.
External Accessories
Bolts and Nuts
Used to fasten all panel connections.Fastener grade: A2-70 or A4-70.
Water Level Gauge
Float-type water level gauge made of 304 stainless steel
External Ladder
Provides access for workers to enter the top of the water tank for installation and maintenance.
Silicone Sealant
Applied for sealing the joints between panels and the corner sections.
Base Steel Beam
Increases the base contact area and distributes the weight of a fully filled tank.
Pipe terminal
The connection medium between the tank and the pipeline, which can be threaded or flanged.
What Customers Care About？
We cooperate with leading Chinese steel manufacturer TISCO (Taiyuan Iron & Steel Group) to ensure raw material quality. The tank is made of high-strength hot-dip galvanized steel with excellent toughness, structural strength, and corrosion resistance, ensuring quality from the source.
To maintain price competitiveness, we have established long-term strategic cooperation with raw material suppliers, enabling stable and cost-effective procurement. In addition, we maintain sufficient material inventory to reduce price fluctuations.
Our factory adopts semi-automated production lines, significantly reducing labor costs. Located in Linyi, China – the logistics capital, we also benefit from efficient and cost-effective transportation.
Compared with stainless steel welded tanks, our bolted modular water tank does not require on-site welding. It is easy to install, requires lower technical skills, and allows flexible expansion and convenient transportation. It is widely used in fire protection systems, potable water storage, industrial water systems, agricultural irrigation, and commercial building water supply systems.
We also provide on-site installation guidance and remote technical support, solving installation difficulties for customers without experience or engineering teams.
| Material | Q235 |
|---|---|
| Grade | Food Grade |
| Origin | China |
| Color | Nickel white |
| Panel Size | 0.5*0.5m, 1.22*1.22m, 1*0.5m, 1*1m |
| Certification | ISO3834, ISO9001 |
| HS Code | 730990 |
| Capacity | 1000Litres -Infinity |
| Foundation | Concrete Foundation, U-Steel Bottom Bas |
| Installation | Sitting Type |
| Production Capacity | 2000Ton/Month |
| Transport Package | Pallet Box, Plywood Pallet, Steel Frame |
| Sample | Provided |
| After-Sale Service | Online Technical Support |
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Professional Design Capability
Packing & Shipping
- The products are packaged using iron frames or plywood boxes to ensure they are not damaged during land transportation and shipping.
- Each individual package is covered with a waterproof film to prevent exposure to moisture during long-term sea transportation.
- Accurately label all panels and accessories to facilitate quick installation by customers.
Water Tank Panel Packaging 1
Plywood Box
Water Tank Panel Packaging 2
Steel Frame Support
Water Tank Panel Packaging 3
HDG
Water Tank Panel Packaging 4
GRP/FRP
Large Components
Loose Packing
Small Accessories Packaging
Plywood Box
Full Container Shipment
Steel Frame Packaging
Full Container Shipment
Simple Packaging
Qualification & Certification
Our water tank products are designed and manufactured in strict accordance with domestic and international standards and have passed multiple industry-recognized certifications, including ISO 9001 Quality Management System certification, food-grade stainless steel material standards (SUS304 / SUS316), and drinking water safety-related certifications.
Delivery
- For standard water tank less than 200m3, it would be 3-5 days;
- For non-standard water tank and customized water tank according to client’s specific requirements, it would be 7 to 15 days.
- The final delivery time shall be subject to the actual order confirmation.
The product information provided above may not be detailed or accurate enough. Please refer to actual communication for specific details. You are welcome to contact us！
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