Wound tube heat exchanger is a type of shell and tube heat exchanger. It is mainly composed of wound tube body, shell, tube box, connecting tube and other parts；The winding tube body is made of heat exchange tubes wound at a certain helix angle and consists of central cylinder, heat exchange tubes, spacer strips, pipe collars, jackets and other components. Wound tube heat exchangers can be simply divided into single flow and multi-flow wound tube heat exchangers based on the number of tube sides. Materials that can be made include: austenitic stainless steel, dual-phase stainless steel, carbon steel, copper and copper alloy, aluminum and aluminum alloy, Hastelloy and other wound tube heat exchangers; It is made of heat exchange tubes wound at a certain spiral angle. The medium in the tube flows in a spiral manner. The shell side medium passes through the heat exchange tubes in countercurrent and transversely. The heat exchange tubes between the heat exchanger layers are wound in reverse. The tube and shell side medium transfers heat in pure countercurrent, and the flow form is turbulent flow and the heat exchange coefficient is high; It is widely used in large-scale chemical fertilizer and coal chemical industry low-temperature methanol washing, air separation, natural gas liquefaction, coal-based olefins, refining and reforming, hydrocracking, olefin isomerization, food and medicine and other fields.

As a core component, quality control is particularly important. The heat exchange tubes are required to be delivered in an entire tray and meet the relevant requirements of GB/T24593 and enterprise standards. Eddy current testing and strength testing are carried out one by one at the same time, solid solution treatment and underwater airtightness. Only after the test is passed, and no negative deviation is allowed in the wall thickness of the heat exchange tube; during the winding process, the outer diameter of the tube bundle is measured layer by layer to ensure the outer diameter of the winding and prevent the diameter of the tube bundle from being too large. In order to ensure the quality of the heat exchange tubes after being wound, during the winding process, the first three layers should be inspected one by one, and 10%(no less than 5 pipes) of the tubes in each remaining layer should be randomly inspected for air pressure test.(1.1 times the design pressure), draw 10%(no less than 5 pieces) from the first three layers for ball passing test (75%-85% of the inner diameter); in order to ensure the welding quality of the welded joints between heat exchange tubes and tubesheet, 100% PT testing shall be carried out on the welded joints of heat exchange tubes and tubesheet. According to the owner's requirements, 5%-10% of the welded joints can be randomly inspected for rod positive X-ray testing.

Heart-to-Heart Intelligent Equipment has a professional X-ray inspection system for rod-level tube-sheet welds, which means that the intelligent equipment is at the domestic advanced level in terms of testing technology and heat exchanger quality control capabilities, and can provide customers with reassurance of high-quality. Wrapped tube heat exchanger.