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Transformer Reclassification
Oil Transformer Retrofilling
Mineral oil transformers contaminated with less than 50 ppm PCBs can be reclassified to non-PCB status by draining the PCB-contaminated oil from the transformer tank and retrofilling the unit with clean oil. After the requisite 90-day energized period, the unit will be less than 50 ppm. Transformers that are originally less than 500 ppm PCBs can be reclassified to less than 50 ppm for the life of the unit with one single retrofill process. Transformers containing less than 500 ppm would require more than one refilling to leach the PCBs from the core. Experience has shown that 90% of the PCBs are removed from a transformer core with each retrofill.
On-Site Mineral Oil Decontamination
When quantities of oil at a site are greater than 1000 gallons, PCB Disposal provides our clients with the option of decontaminating the oil on site using our mobile PCB chemical destruction technology. Mineral oil that contains little or no water, detergent or solvent contaminants, can be decontaminated to less than 2 ppm PCBs. The process involves metallic sodium and a catalyst added to the oil. The exothermic reaction produces sodium chloride, sodium hydroxide and a polyphenylene polymer and is terminated by a water quench. The oil mixture can be sent to a waste oil facility for re-refining and reuse.
Improving Transformer Oil Dielectric
In those cases where a transformer contains unacceptable levels of water or other trace contaminants, PCB Disposal can improve the oil quality by processing the oil on-site using our mobile technology. The transformer oil is drained into our processing unit where it is degassified and filtered to improve it's properties including dielectric strength. PCB Disposal services many utilities to keep their transformers operating optimally.
Important Notes:
The new federal PCB Regulations published in the Canada Gazette Sept 17/08 require that all in-service PCB transformers must be replaced by Dec 31/09.
PCB Disposal provides clients with credits for transformers that are < 50 ppm (non-PCB) and depending on whether they have copper or aluminum cores. Also depending on the PCB concentration ( 0 – 49 ppm), we may dispose of the waste oil at no charge.
PCB and non-PCB disposal projects are evaluated on a case-by-case basis and all issues are taken into account when determining the final costs involved.
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A Division of Sanexen Environmental Services Inc.
