Carbon Steel Tank
Storage Tanks
Carbon Steel Storage Tank
1. Product Overview
The carbon steel storage tank is a storage vessel fabricated by rolling and welding carbon structural steel plates, with an anti-corrosion coating system applied to the outer surface. It consists of the shell, wind girders, ladders and platforms, nozzles and anti-corrosion facilities.
Widely applicable to: crude oil and refined product storage, industrial water storage, neutral chemical liquid storage, fire water tanks, etc.
Key features: low cost, mature fabrication technology, extremely wide capacity range (up to tens of thousands of cubic meters), anti-corrosion grade adjustable to the stored medium.
2. Working Principle
The tank relies on the strength and thickness of the steel shell to withstand hydrostatic pressure and the pressure in the gas space; external wind girders provide the rigidity required for large-diameter thin-wall tanks; breather valves maintain slight positive or negative pressure inside; the anti-corrosion coating isolates the steel from the corrosive environment.
3. System Classification
By Stored Medium
| Type | Features | Typical Applications |
|---|---|---|
| Crude oil | Large, floating or internal floating roof | Oilfield gathering, refinery tank farms |
| Refined products | Fixed or internal floating roof | Gasoline, diesel, jet fuel storage |
| Water | No special anti-corrosion required | Industrial circulating water, fire water |
| Chemicals | Special internal anti-corrosion as required | Neutral or mildly corrosive chemicals |
4. Detailed Technical Parameters
4.1 Materials & Anti-corrosion Schemes
| Base Material | Anti-corrosion Scheme | Suitable Media | Remarks |
|---|---|---|---|
| Q235B/Q345R | Epoxy coal tar + glass cloth (reinforced grade) | Crude oil, heavy oil | Standard for above-ground oil tanks |
| Q235B/Q345R | Waterborne epoxy on inner wall | Fire water, industrial water | Standard for water tanks |
| Q235B/Q345R | Special anti-corrosion coating | Mildly corrosive chemicals | Customized by medium |
4.2 Typical Specification Table
| Effective Volume (m³) | Design Pressure | Shell Plate Thickness | Tank Diameter | Structure |
|---|---|---|---|---|
| 50～200 | Atm～0.02MPa | 4～6mm | DN4600～DN6500 | Vertical fixed roof |
| 500～2000 | Atm～0.02MPa | 5～8mm | DN7800～DN12000 | Fixed / internal floating roof |
| 3000～10000 | Atm～0.02MPa | 6～12mm | DN12000～D18000 | Internal / external floating roof |
| >10000 | Atm | 8～32mm | >DN18000 | Large external floating roof |
Note: large carbon steel tanks are normally fabricated on site or shipped as plates for field assembly.
4.3 Design Conditions & Performance Indicators
| Parameter | Specification |
|---|---|
| Shell design code | GB 50341-2014 (Design code for vertical cylindrical welded steel oil tanks) |
| Anti-corrosion grade | Normal / reinforced / extra-reinforced (matching coating thickness) |
| Accessories | Breather valve, hydraulic safety valve, gauge hatch, light hatch, drain nozzle |
| Ladders & platforms | Rooftop handrails, spiral stairway |
4.4 Electrical Parameters
Static equipment with no electrical parameters. If level instruments or lightning arresters are fitted, a low-voltage supply (220V) is required.
5. Core Component Selection
| Component | Typical Brands | Features & Applications |
|---|---|---|
| Breather / hydraulic safety valve | Premium domestic | Maintains tank pressure (-50Pa～+200Pa) |
| Level gauge | Radar / magnetic flap | Radar type preferred for large oil tanks |
| Lightning arrester | National standard | Rooftop lightning protection |
| Heating coil (optional) | Custom | Reduces viscosity of heavy oil |
6. Typical Application Fields
Petroleum refining: crude oil storage and product transfer; Petrochemical: solvent oil, lube base oil; Basic industry: industrial water, fire water; Chemical/environmental: mildly corrosive wastewater, neutralization liquids.
7. Design Standards & Certifications
| Standard | Description |
|---|---|
| GB 50341-2014 | Design code for vertical cylindrical welded steel oil tanks |
| GB 50128-2014 | Construction and acceptance code for vertical tanks |
| API 650 | Welded tanks for oil storage (optional for international projects) |
| ISO 9001:2015 | Quality management system |
| CE / EAC / GOST-R | Available upon request |
8. Customizable Options
| Option | Details |
|---|---|
| Structure | Fixed / internal floating / external floating roof |
| Heating | Steam coil, electric heating (heavy oil) |
| Anti-corrosion | Normal / reinforced / extra-reinforced |
| Insulation | Rock wool clad with galvanized steel or aluminum sheet |
| Accessories | Agitator (small chemical tanks), manholes, fire nozzles |
9. Warranty Terms
| Equipment Status | Warranty Period | Warranty Scope |
|---|---|---|
| New equipment | 12 months | Leak-free welds; coating free of blistering and peeling |
| Refurbished equipment | 6 months | Leak-free welds; repaired coating passes inspection |
| Idle equipment (as-is) | 3 months | Main functional parts |
Note: coatings are consumables. Final terms are subject to the contract. Installation guidance is included with all orders.
10. Packaging & Delivery
| Item | Packaging Method |
|---|---|
| Small (≤50m³) | Bare or wooden-framed |
| Medium/large | Shipped as knocked-down plates and profiles, or built on site |
| Accessories / piping | Wooden case or carton |
Container Estimation: a small 50m³ tank fits approx. one 40'HQ; large tanks are always shipped knocked-down.
Installation: on-site guidance and welding supervision provided (travel and accommodation borne by the buyer).
11. Information Required for Quotation
Stored medium, density and temperature; effective volume; whether a floating roof is required; anti-corrosion grade; heating coils; wind/snow/seismic loads; equipment condition preference (new/refurbished/idle); delivery terms (FOB/CIF/DDP); destination port or address.