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Underground Drainage Tank Vol.20m³ (UDT-20)

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  • Our standard or individual design
  • Anti-corrosion coating selected for your product

 To order

EuroTankWorks produces underground 20 m³ drainage storage tanks with and without heating-up, used for storing the rest of oil products discarded from the technological pipelines, including water mixed. The use of tanks for storing harsh chemicals is also allowed.

The UDT-20 tank is a shop-welded vessel with a storage volume of 20 cubic meters.

Our standard UDT-20 tank

Our customers are always able to purchase an underground 20 m³ storage tank, produced according to our standard graphical drafts. We are also ready to consider Your specific demands or produce an underground storage tank on the basis of your own draft.

  Underground drainage tank Vol.20 cbmUDT-20 scheme

Our standard UDT-20 is a horizontal steel cylindrical apparatus with conical bottoms. The body of the tank has 2 manway plates installed, the 1st being used for operating service, the 2nd – for pumping out the product from the tank with a semi-submersible electric pump.

The outreach of the manway plates is more than 1 m, that is why the plates and the fitting pipes are cut at 0,4 m point from the shell.

The electric motor of the pump is protected by the maintenance shaft (included in the scope of delivery). For the purpose of controlling the technological operation fitting pipes and chokes are provided for the level glass, temperature log and pressure indicator.


Type Nominal volume, m3 Inner diameter, mm Length, mm Necktube height, mm Net weight, kg Heated surface, m2
Underground storage tanks without heating-up 20 2400 4830 900-1600 3590  
Underground storage tanks with heating-up  20 2400 4830 900-1600 3650 3,2


Parameter: Rate:
  Underground tank with/without heating-up Stab in heater:
Maximum operating pressure 0,07 MPa 0,5 MPa
Estimated pressure 0,07 MPa 0,7 MPa
Trial pressure 0,2 MPa 1 MPa
Maximum operating temperature 80ºС 164ºС
Estimated temperature 100ºС 180ºС
Vessel group according to branch standard OST 26 29 1-94 5a  
Corrosion allowance 2,0 мм  
Estimated operating life period 20 years  
seismic activity rated on Richter scale 6  



UDT-20 with heating-up

If necessary, UDT-20 can be equipped with heating and thermal insulation systems. As a rule, we use heating with an electric heating cable, or spiral heating inside the tank.

Underground drainage tank with heating spiral:

Drainage tank with spiral heaterThe design provides a built-in heater in the form of a coil. Saturated water vapor, water or a 60% DEG solution can be used as a heat carrier.

The tank is additionally equipped with metal structures of a heated well.

The choice of the type of heating device is made jointly with the Customer based on the specifics of the stored product and the location of the container.

Underground drainage tank with electrical heating:

Electric heating

Electrical heating is provided by the self-control heating cable.

The heating-up system consists of:

  • the heating module (cable),
  • the distributing & information module,
  • the operating system (control box, temperature detectors and regulators).

Heat Insulation:

heat insulation

Heat insulation of our standard underground storage tank is performed by sputtering method with rigid polyurethane foam. The sputtering is done on the outside surface of the tank. The characteristics of the heat insulation coating are determined separately for each tank depending on chemical composition and the required temperature of the stored product, climate features in the location area, etc. Overall energy loss decrease by 40 % at minimum as a result of heat insulation.

Rigid polyurethane foam coating is an effective measure, as it provides air insulation, steam insulation as well. It is highly resistant to aggressive atmosphere and shows maximum integrity with the tank surface (1.0-1.5 kg/cm²). Due to this the polyurethane foam is considered to be a perfect corrosion preventive coating.

To ensure additional toughness of the heat insulation coating it has protective seal of polyuria. The seal is also meant to increase the operating life of the coating (from 35 years) and of the tank itself as well. If the customer demands we can also provide heat insulation with the mineral wool and protective layer of galvanized steel. This type of heat insulation is considered to be more low-budget, but it has, at the same time, certain disadvantages compared to polyurethane foam coating. They are to be seen in lower rates of steam impermeability, seams on the protective layer, shorter period of operating life.

The pump for the UDT-20

The pumps for underground storage tanksThe standard design of EuroTankWorks underground storage tanks implies semi-submersible vertical pumps of HB type. Depending on the atmosphere characteristics the pumps with double seal can be used, in corrosion preventive or explosion preventive versions. Electric motor of the pump is installed in the maintenance shaft, included in the scope of delivery.

The high-pressure pumps do not require special service, control and don’t have to be equipped by additional automatic systems. This pump was worked out specially for underground drainage storage tanks for pumping over polluted water and oil products with the rate of viscosity up to 500 sSt.

The basic characteristics of the pump:

  • ime to failure – not less than 7000 hours, average operating life resource preceding the total overhaul — 10000 hours.
  • Rate of delivery (through flow): 50 m³/h, depth of immerse: 0,5 — 9 m.
  • Cubic hard impurity content up to 10 mm in the pumped product: up to 3 %.
  • Operating temperature from -65° to + 130°С;
  • Material of flow tube — steel 35HML.

The pump has two mechanical seals and a middle section with barrier fluid. The runoff of the fluid is controlled by a special device.

The tank may be equipped by a different pumping system with suitable characteristics on the customer’s demand.


Other tank volumes:

UDT-5 < UDT-8 < UDT-12,5 < UDT-16 < UDT-20 > UDT-25 > UDT-40 > UDT-63

Underground Drainage Tank Vol.20m³ (UDT-20)
To order