THERMAL STRESS RELIEVING DEVICE

PURPOSE:To prevent a container for treating a high-temperature and low-temperature fluids from being cracked due to thermal stress or the like, by a method wherein substances having high heat capacity and various heats of fusion are packed into an inlet part of the container. CONSTITUTION:A header 3 is provided at the inlet part 2 of the container 1 for treating high-temperatue and low-temperature fluids, guide vanes 4 for uniformly distributing the fluid (which is introduced into the container through the inlet part 2) into each passage are provided in the inside of the header 3, each of the guide vanes 4 is provided with a plurality of holes 5, and substances having high heat capacity and various heat of fusion are packed into the holes 5. Accordingly, the fluid is passed uniformly and smoothly. In addition, even when an extremely large temperature differency exists between the flowing-in fluid and the container or between the flowing-in fluid and the fluid contained in the container, high temperature is controlled stepwise by the substances packed in the guide vanes 4, and accordingly, the container 1 can be prevented from being cracked due to thermal stress or the like.