Abstract
Damage in recent earthquakes showed the importance of piping joint for deflection absorbing. The joint absorbs the deflection caused by subsidence of ground and earthquakes, and prevent the pipes from damage. In this paper, the author classifies the piping joint seeing the mechanism how to absorb the deflection, and sets up a list which shows the relation between the classification from and the absorbing direction of the deflection. He also clarifies and suggests the necessary items to check the deflecting character of the piping joint, the conditions and consequences of each test, and the necessary items to check the capable absorbing direction of the piping joint. In the latter part, the existing state of performance and test of the piping joint is investigated, and he found that most of the piping joint are not tested as for its performance of the deflection absorbing. Consequently, the author proposes to establish a concreter method of testing the piping joint for deflection absorbing.
