Hot Oil Cleaning When maintenance is needed to arrest the aging process in the oil, the common recommendation is hot oil cleaning. It’s more than cleaning the oil, it’s cleaning the insulation. Not all hot oil cleaning is the same. SD Myers has a proprietary process which is proven to extend the life of the transformer. Heat, moisture and oxygen cause oxidation. Oxidation creates acids and other damaging by-products that attack and weaken the paper insulation. Our hot oil cleaning process removes oxidation decay products by recirculating clean hot oil through the transformer using our proprietary recyclable filter media. It is important to address the need for hot oil cleaning early to limit the damage to the solid insulation and “arrest” the aging process. Once the life of the paper is lost, it cannot be restored. Ongoing monitoring of flow rates and temperature is key to proper hot oil cleaning processing. Responsible equipment operators must have adequate instrumentation and quality test equipment on-site to ensure the oil and paper are thoroughly cleaned. Accurate processing will prevent any further damage to the paper quality years after the hot oil cleaning process has been performed. Our recyclable filter media means no waste left behind. Our hot oil cleaning process can be performed energized or de-energized. Cleaning the oil of contaminants will extend the life of your transformer.