Underground fuel tanks

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.
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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 capacityOuter diameter of internal tankLength of wallTotal length of tankClass A (S1, S2)Class B (S1, S2)Number of lifting lugs (min)
[m3][mm][mm][mm][mm][mm][pcs]
31 2502 3002 720551
51 2503 9004 320551
31 6001 5002 040552
51 6002 5003 040552
81 6004 0004 540552
101 6005 0005 540552
131 6006 5007 040552
161 6007 9007 440552
102 0003 0003 660662
132 0004 0004 660662
162 0005 0005 660662
19,72 0006 0006 660662
252 0008 0008 660662
302 0009 50010 160662
352 00011 00011 660662
202 5004 0004 800672
252 5005 0005 800672
302 5006 0006 800672
402 5008 0008 800672
502 50010 00010 800672
602 50012 00012 800672
702 50014 00014 800672
302 9004 1004 900792
402 9006 0006 900792
502 9007 5008 400792
602 9009 0009 900792
702 90010 50011 400792
802 90012 00012 900792
1002 90015 00015 900792
1203 00017 00017 960792

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.