Does the heat transfer oil in a heat transfer oil boiler need to be tested regularly on an annual basis?

The heat transfer oil in heat transfer oil boilers does indeed need to be tested regularly to ensure stable performance and safe use. This is because during the operation of the boiler, the heat transfer oil may experience changes in its properties due to high temperatures, oxidation, contamination, and other factors; deposits and acidic substances may even form. All of these can affect the heat transfer efficiency of the heat transfer oil, and may even pose a threat to the safe operation of the boiler. Generally, the inspection interval for heat transfer oil depends on various factors, such as the intensity of boiler usage, the type and quality of the heat transfer oil, and the manufacturer’s recommendations. It is generally recommended to conduct tests at least once a year; for boilers that are used more frequently or operate under more severe conditions, more frequent testing may be necessary. The following are some items and parameters that may need to be considered during the testing of heat transfer oil: 1. Viscosity: As it is used over time, heat transfer oil may become thicker, which can affect its flow properties and thermal efficiency. 2. Acid value: It reflects the degree of oxidation of the oil; a high acid value often indicates that the oil has begun to deteriorate. 3. Carbon residue: Excessive carbon residue can affect the circulation of hot oil and heat transfer. 4. Flash point and ignition point: Ensure the oil can be used safely within specified temperature ranges. 5. Moisture and impurity content: Excessive moisture and impurities can affect the heat transfer of the oil and cause corrosion of system components. The sampling method is usually carried out by professional maintenance engineers or technical personnel provided by the manufacturer; it is important to ensure that the samples taken represent the condition of the heat transfer oil throughout the entire system. Sampling points are generally selected at locations within the system where the hot oil flows well and where sampling is easy to perform. When sampling, care must be taken to avoid the inclusion of contaminants, and it should be stored and transported in accordance with the proper procedures. As for testing, some companies may have their own oil testing laboratories, but most choose to send samples to specialized third-party laboratories for analysis, as these laboratories possess more precise testing equipment and extensive experience. .