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What is the working principle of a hydrophobic expansion tank? Principle: When the steam from boilers and other devices under high pressure enters the steam trap tank, it passes through the expansion tank – which is equipped with cooling water pipes – where its pressure is reduced, and part of it vaporizes to become steam. The unvaporized hot water, after being cooled, is sent to the drain tank for reuse, which helps reduce heat loss and water loss. The steam can be fed into the plant’s low-pressure steam network for use. Additional information: The function of the hydrophobic expansion vessel is to receive various types of drainage from the steam turbine unit, including drainage from the main steam, reheat steam, extraction systems, high-pressure heaters in case of accidents, low-pressure heaters during normal operation as well as in case of accidents, small steam turbines, auxiliary steam systems, and the deaerator overflow. It expands, reduces the pressure, and lowers the temperature of this drainage in order to process the working fluid. During operation, care must be taken to ensure that the steam traps do not overheat or vibrate, as this could damage the equipment and affect the vacuum level of the main unit as well as the operation of the entire system. Additionally, since there are significant differences in the pressure and temperature of steam at various locations, it is necessary to categorize the steam traps based on their pressure levels. To avoid interference between hydrophobes under different pressures, which could lead to accidents and increased stress, those with similar pressures are connected to the same manifold. This unit is equipped with high and low pressure drain headers, which are located at the high-pressure condenser.