PROGNOSIS OF THE AGING OF THE PIPE ELBOW IN THE LITHUANIAN POWER STATION

Abstract

In this paper there were given the results from the investigation of the mechanical properties of pipe elbow modeled with finite element under the working conditions of 550ºC. The pipe elbow was modeled with three different boundary conditions: i.e. when the pipe is constructed from the separate tensile, compression and the neutral zones. Analysis was performed with mechanical properties from neutral and tangential zones. The second test has been investigated under the dynamical load conditions.

After the investigation of mechanical properties of overheated steam pipe elbow under the working performance of 45000 exploitation time at AB Lithuania power plant and under the working temperature of 550ºC there can be draw a conclusion that stress do not  exceed the admissible stress limit.

At the dynamical load case, more then 95% of working pressure reaches its load limit in less then the 1% of total intended time. Such an imitation of the load causes resonance processes.

http://dx.doi.org/10.5755/j01.mech.17.5.723