Underground storage vessels - for whom?
Underground tanks are designed to storage fuels and various types of toxic and non-toxic, caustic and poisonous liquid substances used in:
- fuel distribution points for road traffic,
- industrial facilities and agricultural facilities,
- transport companies,
- military units and facilities.
Steel tanks for fuel - specification
Technical specification of underground storage vessel
Number of compartments
from 1 to 8
capacity [m3]
from 3 to 200 m3
Work
temperature [°C]
from -20 to +50oC
Diameter [mm]
from 1000 to 3600 mm
Wall's structure
double wall or single wall
Material
certified carbon steel S235JR
General information
- preparation of the outer and internal surfaces by blasting to grade
Sa 2.5 acc. to ISO 8501-1 - adaptation of the tank to the wet and dry method of leakage detection system
Standard
accordance with EN-12285, DIN 6608
Construction
horizontal, cylindrical tank
External
coating
with Endoprene tested for breakthrough of 6.000 V
Internal
coating
as an option
Designation
- storage of fuels at fuel distribution points
- storage of other flammable, caustic or poisonous liquids
Number of compartments
from 1 to 8
capacity [m3]
from 3 to 200 m3
Work
temperature [°C]
from -20 to +50oC
Diameter [mm]
from 1000 to 3600 mm
Wall's structure
double wall or single wall
Material
certified carbon steel S235JR
General information
- preparation of the outer and internal surfaces by blasting to grade
Sa 2.5 acc. to ISO 8501-1 - adaptation of the tank to the wet and dry method of leakage detection system
Standard
accordance with EN-12285, DIN 6608
Construction
horizontal, cylindrical tank
External
coating
with Endoprene tested for breakthrough of 6.000 V
Internal
coating
as an option
Designation
- storage of fuels at fuel distribution points
- storage of other flammable, caustic or poisonous liquids
Standard equipment of underground storage vessel
- Manhole DN 600
- Suction pipe DN 50 or DN 40
- Venting pipe DN 50 with venting valve
- Drain pipe DN 40
- Filling pipe DN 50 – 100 with overfill prevention valve DN 50 and camlock
- Socket for manual measurement DN 50 with camlock
- Socket for automatic measurement DN 100 with camlock
Additional customization options
- Traffic zone sump 920×920, H950 mm
- Traffic zone sump 1400×740, H950 mm
- Traffic zone cover 920x920mm with concrete ring
- Waterproof traffic zone cover 1400×740 mm, 400 kN with concrete ring
- Green zone sump 1200×1400 mm, H1100 mm
Standard dimensions of underground tanks
| Nominal capacity | Outer diameter of internal tank | Length of wall | Total length of tank | Class A (S1, S2) | Class B (S1, S2) | Number of lifting lugs (min) |
|---|---|---|---|---|---|---|
| [m3] | [mm] | [mm] | [mm] | [mm] | [mm] | [pcs] |
| 3 | 1 250 | 2 300 | 2 720 | 5 | 5 | 1 |
| 5 | 1 250 | 3 900 | 4 320 | 5 | 5 | 1 |
| 3 | 1 600 | 1 500 | 2 040 | 5 | 5 | 2 |
| 5 | 1 600 | 2 500 | 3 040 | 5 | 5 | 2 |
| 8 | 1 600 | 4 000 | 4 540 | 5 | 5 | 2 |
| 10 | 1 600 | 5 000 | 5 540 | 5 | 5 | 2 |
| 13 | 1 600 | 6 500 | 7 040 | 5 | 5 | 2 |
| 16 | 1 600 | 7 900 | 7 440 | 5 | 5 | 2 |
| 10 | 2 000 | 3 000 | 3 660 | 6 | 6 | 2 |
| 13 | 2 000 | 4 000 | 4 660 | 6 | 6 | 2 |
| 16 | 2 000 | 5 000 | 5 660 | 6 | 6 | 2 |
| 19,7 | 2 000 | 6 000 | 6 660 | 6 | 6 | 2 |
| 25 | 2 000 | 8 000 | 8 660 | 6 | 6 | 2 |
| 30 | 2 000 | 9 500 | 10 160 | 6 | 6 | 2 |
| 35 | 2 000 | 11 000 | 11 660 | 6 | 6 | 2 |
| 20 | 2 500 | 4 000 | 4 800 | 6 | 7 | 2 |
| 25 | 2 500 | 5 000 | 5 800 | 6 | 7 | 2 |
| 30 | 2 500 | 6 000 | 6 800 | 6 | 7 | 2 |
| 40 | 2 500 | 8 000 | 8 800 | 6 | 7 | 2 |
| 50 | 2 500 | 10 000 | 10 800 | 6 | 7 | 2 |
| 60 | 2 500 | 12 000 | 12 800 | 6 | 7 | 2 |
| 70 | 2 500 | 14 000 | 14 800 | 6 | 7 | 2 |
| 30 | 2 900 | 4 100 | 4 900 | 7 | 9 | 2 |
| 40 | 2 900 | 6 000 | 6 900 | 7 | 9 | 2 |
| 50 | 2 900 | 7 500 | 8 400 | 7 | 9 | 2 |
| 60 | 2 900 | 9 000 | 9 900 | 7 | 9 | 2 |
| 70 | 2 900 | 10 500 | 11 400 | 7 | 9 | 2 |
| 80 | 2 900 | 12 000 | 12 900 | 7 | 9 | 2 |
| 100 | 2 900 | 15 000 | 15 900 | 7 | 9 | 2 |
| 120 | 3 000 | 17 000 | 17 960 | 7 | 9 | 2 |
S1 – thickness of the inner tank shell
S2 – thickness of the inner dish end
At the customer’s request, we can make tanks with other diameters and capacities.
Underground single- and double-skinned tanks
The type of medium to be stored is an important factor influencing the design of the fuel tank. One of the structural elements of an underground tank is the number of shells i.e. walls of the tank. For substances that are neutral and do not pose a threat in case of a leakage, one wall is used as standard. The single-wall tanks offered by Ekonstal are fully safe, tight and highly resistant to external factors.
Storage of flammable, corrosive, toxic, chemical or aggressive liquids requires additional protection and reinforcement. Additionally, some of the substances (e.g. diesel oil or diesel fuel) may only be stored in double-skinned tanks, which is subject to the applicable law. Double-walled tanks allow for safe storage of all kinds of aggressive and environmentally hazardous substances. In this case the medium is stored in the internal tank (main tank) and the second shell (outer) is an additional protection against uncontrolled leakage. It must contain at least 110% of the volume of the substance in the inner tank. Such design ensures tightness and enables safe operation of the underground fuel tank.
Methods of detection leakage from underground tanks
In the case of double-walled tanks by Ekonstal, the interstitial area (space between the inner tank and outer wall) can be monitored with dry or wet method. Both methods of leak detection enable to effectively and quickly protect the environment against the effects of a possible leakage of the tank. Depending on the customer’s measurement system, we adapt the underground fuel tanks to the indicated monitoring method. These types of systems enable to quickly identify a possible leak and take an immediate action to limit the potential effects, e.g, soil or groundwater contamination. Such technologies contribute to the improvement of efficiency and safety of storage of liquid fuels and other substances.