Abstract
In order to enable safe long-term operation, metallic pipes operated in the creep range at high temperatures require considerable wall thicknesses at significant operating pressures, such as those required in thermal power plants of all kinds or in the chemical industry. This paper presents a concept that makes it possible to design such pipes with thinner wall thicknesses. This is achieved by adding a jacket made of a ceramic matrix composite material to the pipe. The high creep resistance of the jacket makes it possible to considerably extend the service life of thin- walled pipes in the creep range. This is demonstrated in the present paper using hollow cylinder specimens. These specimens are not only investigated experimentally but also numerically and are further analyzed after failure. The investigations of the specimen show that the modeling approaches taken are feasible to describe the long-term behavior of the specimen sufficiently. Furthermore, the paper also demonstrates the possibility of applying the concept to pipeline components of real size in a power plant and shows that the used modeling approaches are also feasible to describe their long-term behavior.
