This double stage oil filtration plant is suitable for treating used transformer oil by first heating it and then passing it through specially designed filter and then subjecting it to vacuum treatment which dehydrates and degasifies the oil to achieve the desired improvements after filtration as per IS 335-1993 for new transformer oil purification and IS 1866 for used transformer oil filtering.rolley Mounted Degassing Chamber (Double Stage Degasification) Heaters Coarse Filter (Consumable)