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The expansion tube serves as the main channel that connects the heat transfer oil system to the overhead tank. Given the special characteristics of the heat transfer oil system, strict requirements are placed on these expansion tubes: 1. As the temperature rises in the system, the volume of the heat transfer oil increases; the excess volume flows into the overhead tank through the expansion tube, thereby reducing the operating pressure of the system. 2. During the heating and operation of the heat transfer oil system, the water and low-boiling substances present in the heat transfer oil vaporize, generating a large amount of gas that increases the pressure within the system. The vaporized gas is released from the expansion tube into the overhead tank and then discharged from there. 3. During operation, the removal of water and low-boiling substances from the heat transfer oil leads to a lack of oil in the system, causing the oil to coker and affecting the normal operation of the system. Therefore, the heat transfer oil in the high-level tank is replenished into the system through expansion tubes to ensure the proper operation of the heat transfer oil system. 4. When the heat transfer oil system is in operation and a power outage or an emergency shutdown occurs, the flow of heat transfer oil within the system comes to a halt. The heat transfer oil in the furnace tubes continues to heat up due to the residual heat from the oil furnace, which accelerates the overheating, cracking, and aging of the heat transfer oil. Therefore, to prevent the heat transfer oil from aging, the cold oil in the high-level tank is replaced by the hot oil in the expansion tube replacement system, and the hot oil in the system is slowly transferred into the low-level storage tank. For more inquiries and technical support regarding heat transfer oils, please visit Schultz Heat Transfer Oils’ official website at www.shschultz.com