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Cleaning of thermal oil in heating systems: Solids can often be removed through bypass filtration when the system can be operated effectively (that is, reasonably), the thermal oil is only slightly oxidized, or the wetted surface of the system is only slightly corroded. Filtration can be performed at low temperatures using several filters capable of removing nominal particle sizes of 100 microns or less. The thermal oil can also be bypassed and filtered through a glass fiber wound filter cartridge while the system is running. These fiberglass filters are suitable for organic heat transfer oils below 400°C and are available from filter manufacturers. The causes of insoluble matter, such as overheating and contamination, must be removed to ensure proper system operation in the future. When the bypass is equipped with a 30 micron fiberglass filter, the system can stay clean and run for months without clogging. Cleaning of the Heating System After Drainage of Thermal Oil When the heat transfer performance of the heating system is reduced due to fouling, or the solids content of the thermal oil is too high for ordinary filtration, chemical cleaning of system components may be effective. Sludge and sediment are usually metal oxides and thermal oil decomposition products. These contaminants can generally be dissolved and dispersed with organic chemical cleaning agents to remove dirt deposits and silt. The recommended cleaning procedure is as follows. Preparation for chemical cleaning of the system When the temperature of the thermal oil is as safe as possible (below 60°C), drain it through the low drain port. Dispose of hot oil from the system in accordance with prescribed disposal methods. If possible, install a fine-mesh filter between the system return line and the circulation pump. Additional installation of low-level and high-level exhaust devices on major system components. Have auxiliary equipment ready such as: Transfer pumps, oil storage tanks, empty oil drums, etc. to transport cleaning agents and store waste thermal oil and waste cleaning agents. Appropriate safety measures should be taken before cleaning agents are introduced into the heating system.