Structure: there is only one tube plate, the tube bundle consists of a number of U-shaped tube, tube ends are fixed in the same tube plate, the heat exchanger tube can be free to expand and contract.

Advantages: The problem of temperature difference stress is solved by the free floating of the end of U-shaped tube. Simple structure, cheap price, strong pressure capacity. Few sealing surfaces, reliable operation, low cost. The tube bundle can be withdrawn, and it is convenient to clean between the tubes (shell course).

Disadvantages: due to the limitations of the tube bending radius, the distribution of fewer tubes. Shell process fluid is easy to form a short circuit. Bad a U-shaped tube is equivalent to bad two tubes, the scrap rate is high. Tube process cleaning difficulties, tube process fluid must be clean and not easy to scale the material.

Scope of application: is a heat exchanger can be used for high temperature, high pressure, high temperature difference in the heat exchanger. Apply to the shell wall temperature difference or shell process media scaling need to be cleaned, and is not suitable for the floating head type and fixed tube plate occasions.