Harbin Boiler Fuel advises that, generally speaking, the actual operating temperature of any thermal oil product, particularly mineral oil types, should be at least 10℃ lower than its maximum allowable operating temperature to ensure a certain service life and good safety and economic performance.

To prevent over-oxidation, since thermal oil is prone to oxidation reactions at high temperatures in the heat carrier, leading to deterioration and quality degradation, nitrogen protection for the high-temperature expansion tank can ensure the system's sealed integrity and prevent contact with air, thereby extending the service life of the thermal oil.