SF Double-Wall Underground Fuel Tanks
An SF double-wall tank is an underground fuel tank with a steel inner tank and a fibreglass-reinforced plastic (FRP) outer tank. The space between the two walls is monitored, so a breach in either wall can be detected while the other wall still holds the fuel.
We build five standard sizes, SF-10 to SF-50, from 10 to 50 m³. The inner tank is Q235B steel, 6 mm thick. The outer tank is FRP, 6 mm thick, built up on our FRP spray lines.
Tanks are manufactured to SH/T 3178. Our UL 1746 certificate is 20161115-MH61687, for jacketed underground tanks for flammable liquids, issued 2016. We supply SF tanks under framework agreements to a national fuel retailer's provincial station networks.
| Construction | Steel inner tank + FRP outer tank, interstitial space for leak detection |
|---|---|
| Inner tank | Q235B steel, 6 mm |
| Outer tank | FRP, 6 mm |
| Nominal capacity | 10 to 50 m³ |
| Inside diameter | Φ2400 to Φ2800 mm |
| Overall length | 3,600 to 9,800 mm |
| Service | Underground storage of petrol and diesel |
| Manufacturing standard | SH/T 3178 |
| UL certificate | UL 1746, certificate 20161115-MH61687, jacketed underground tanks for flammable liquids, issued 2016 |
Standard models
| Model | Nominal capacity (m³) | Inside diameter (mm) | Overall length (mm) | Inner tank | Outer tank |
|---|---|---|---|---|---|
| SF-10 | 10 | Φ2400 | 3600 | Q235B, 6 mm | FRP, 6 mm |
| SF-20 | 20 | Φ2400 | 6000 | Q235B, 6 mm | FRP, 6 mm |
| SF-30 | 30 | Φ2600 | 7200 | Q235B, 6 mm | FRP, 6 mm |
| SF-40 | 40 | Φ2800 | 8500 | Q235B, 6 mm | FRP, 6 mm |
| SF-50 | 50 | Φ2800 | 9800 | Q235B, 6 mm | FRP, 6 mm |
- Fuel stations: underground petrol and diesel storage
- Multi-grade stations, using compartmented SF tanks
- Skid-mounted refuelling units of the JY series
- Material verification of Q235B plate against mill test reports.
- CNC cutting and rolling of the inner-tank shell.
- Inner-tank seams welded by SAW to qualified WPS/PQR.
- Weld NDT and air-tightness testing of the steel inner tank.
- CNC shot blasting of the steel inner tank.
- FRP outer tank built up to 6 mm on our FRP spray lines.
- Final inspection, marking and loading with overhead cranes up to 50 t.
- Documents supplied: certificate of conformity, quality certificate, as-built drawings, MTRs, WPS/PQR welding records, NDT and test reports, and packing list.
How does a double-wall tank help monitor leakage?
The interstitial space between the steel inner tank and the FRP outer tank is monitored. Fuel entering it from an inner-wall breach, or water from an outer-wall breach, is detected while the other wall still contains the fuel.
What must we verify before selecting a double-wall tank for a fuel station?
Capacity and dimensions against the pit and site layout, the standard and certificates your authority requires, the leak-monitoring method, the manway and nozzle layout, compartments for several grades, and the groundwater level for anchoring.
Which standard and certificate apply to your SF tanks?
Tanks are manufactured to SH/T 3178. Our UL 1746 certificate is 20161115-MH61687, for jacketed underground tanks for flammable liquids, issued 2016. Confirm with your authority which approvals your project needs.
Do you provide installation support?
Our crews have set SF tanks in station pits on projects in China. For projects elsewhere, tell us the site and the scope you need, and we confirm what support we can offer.
Quote this product.
Send the medium, design pressure, temperature and quantity. An engineer replies with questions or a quotation.
- Sales contact
- Mr. Yu Jiakang
- WhatsApp / WeChat
- +86 183 1791 9067
- Factory
- No. 2666 Jinxian Avenue, High-tech Industrial Park, Jinxian Economic Development Zone, Nanchang, Jiangxi, China 331700
Pressure vessels, storage tanks, SF double-wall tanks, steel structures and skid-mounted units, fabricated in Jinxian, Jiangxi since 2003.
Jiangxi Wanlong Industrial Co., Ltd.
No. 2666 Jinxian Avenue, High-tech Industrial Park, Jinxian Economic Development Zone, Nanchang, Jiangxi, China 331700
Contact
- Mr. Yu Jiakang
- WhatsApp +86 183 1791 9067
- jiakang@wanlongindustrial.com
