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Oil transformer bund - retention tank

Many industrial devices such as immersed power transformers contain several thousand liters of transformer oil in their internal cooling or insulation systems. These oils belong to the hydrocarbons classification and may cause severe soil or water pollution in case of leakage.

In order to mitigate this pollution risk, such industrial equipment must be paired with retention equipment of a volume at least equal to the volume of hydrocarbons they contain: the full retention principle. The European standard EN 61936-1 (§ 8.6.2.) for transformers requires a watertight retention representing 100% of the oil volume oil contained in the transformer. Additional protection such as extinguishing cover or suffocating gratings are recommended to avoid slippery stones or pebbles below the transformer in the concrete retention pit. It avoid fire to take too much power, pass through fire protection wall and spread to all your installation.

Furthermore, when the equipment is installed outside it is subject to rainwater that can fill this primary retention tank. To overcome this rainwater/oil leak overflow risk, the tank must be equipped with a system that filters and continuously discharges rainwater while retaining hydrocarbons within a secondary retention device. Authorities have set the hydrocarbon contamination limit to no more than 5ppm hydrocarbon in discharged water (EN 858-1: "light liquid separations facilities").

Leaking transformer with no retention bund
Dielectric oil leakage below transformer not being equipped with retention bund retention pit or tank SANERGRID in the substation and water drainage system with oil interceptor in offset pit
Hydrocarbons fire pool below electrical oil transformer
hydrocarbons fire pool below oil transformer after transformer explosion without fire extinguishing system SANERGRID of fire suffocating grating instead of sones or pebbles
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ERT® Extinguishing...

SANERGRID® ERT® product range allows you to comply with all regulatory and technical requirements regarding retention, fire suppression and oil spill. ERT® tanks are mainly used in the field of electrical transformer oils but they can also apply to any...
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TRT® Welded retention...

SANERGRID® TRT® product range allows you to comply with all regulatory and technical requirements regarding hydrocarbons retention in outdoor conditions. TRT® tanks are mainly used in the field of electrical transformer oils bund but they can also apply to...
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BDRSA Assembled...

SANERGRID® BDRSA product range allows you to comply with all regulatory and technical requirements regarding hydrocarbons retention in indoor conditions. BDRSA tanks has its 4 walls that can be disassembled to fasten installation process. Mainly used in the...
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SANERVIB™ low...

Silentbloc SANERVib  for noise and vibration reduction especially designed for transformers to erase the vibrations frequencies of the electrical transformers (fundamental 100Hz & harmonic vibrations) 
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ERT-MODULO™ Modular...

SANERGRID® ERT-MODULO™ product range allows you to comply with all regulatory and technical requirements regarding retention, fire suppression and oil spill. Modular extinguishing retention tanks in 2,3,4 parts for big substation transformers where...
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TRT-MODULO™ Modular...

SANERGRID® TRT-MODULO™ retention tank for power transformer product range allows you to comply with all regulatory and technical requirements regarding hydrocarbons retention in outdoor conditions. Modular extinguishing retention tanks in 2,3,4 parts for...
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TRFLEX® REFOR Flexible...

Oil transformer temporary storage flexible retention tank TRFLEX®-REFOR Tubular reinforced metallic structure for long period storage. High resistance tarpaulin  especially reinforced mechanically, to corrosion, hydrocarbons and ultraviolet. Deploy the...
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EXTICOV™ Extinguishing...

SANERGRID® Extinguishing cover for transformers pits EXTICOV™ range allows you to comply with all regulatory and technical requirements regarding fire suppression and oil spill. Tested by independent laboratory, it allows to avoid the classical pebbles and...
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TRFLEX®-ECO Flexible...

Oil transformer temporary storage of heavy equipment in outdoor condition, truck, oil immersed transformers... TRFLEX®-ECO : L square metallic structure for short period storage. High resistance tarpaulin  especially reinforced: mechanically, to corrosion,...
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