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Heat exchangers are heat transfer devices that pass heat through the hot fluid to the cold fluid, also known as heat exchangers. Heat exchangers are chemical, oil, power, food and many other industrial sectors of the common equipment, occupies an important position in the production. Common heat exchangers in chemical production are heaters, coolers, condensers, evaporators and reboilers.

Whether the heat exchanger is in danger, except for the maximum working pressure, the key to see its structure and heat transfer fluid.

Water temperature below the boiling point of hot water and cold water heat exchanger heat exchanger is very dangerous, not a pressure vessel. The water-water heat exchanger is not a pressure vessel.

Hot water temperature is higher than the boiling point of hot water or steam, heat exchanger with cold water heat exchanger must be a pressure vessel? Not necessarily. If the high temperature side of the fluid in the tube, the tube outside the boiling point is below the low temperature water heat exchanger, nor is the pressure vessel. If the casing heat exchanger is not a pressure vessel.

Some heat exchangers are high temperature, high pressure, high volume, contain dangerous fluid, complex structure, but the risk is relatively small, design, manufacture in accordance with the pressure vessel for supervision, installation, use, maintenance, inspection and other aspects of the use of self-management units. Such as aluminum plate fin heat exchangers, shellless casing heat exchangers, spiral plate heat exchangers, brazed plate heat exchangers, and the like.