Objective
Project aim is to develop calculation methods, instrumentation/measurement systems and computer algorithms to solve the major problems associated with the lifetime monitoring of piping components operating in the creep range in highly loaded power plants.
Software modules for calculating creep relevant stresses and strains in typical piping components loaded by internal pressure and external forces and moments have been developed. For straight pipes, bends, spherical fittings, reducers and wallthickness transitions the modules were evaluated using linear elastic and inelastic finite element calculation methods.
Software modules have been developed for prediction and monitoring of fatigue strains due to thermal transients by non intrusive temperature measurements on the outer surfaces of components. Online calculations of rapid changing thermal loadings requires effective algorithms. The reverse fast Fourier transformation method has shown significant advantages and will be used in the further project.
Calculation and monitoring of lifetime relevant dynamic loadings in high temperature piping system were examined. Improved methods based on the response analysis were used. A software programme was developed to aid the selection of optimum measuring points in piping system for online monitoring of the dynamic behaviour.
Development of advanced techniques for built determination of pipework (eg photogrammetry, tachymetry) has started.
In general the project has been successful and the main conclusions are:
creep relaxation can be included in an online life monitoring system by the use of simple stress reduction factors;
the effect of external loads can be taken into account with a modest increase in instrumentation and the use of precalculated influence coefficients;
realistic 3-dimensional thermal stresses can be calculated online or quasi online from simple nonintrusive thermocouples mounted on the outside of pipe components;
high cycle fatigue caused by thermohydraulic transients can be included in the lifetime monitoring system (LMS) by using a library of precalculated transients and a mixture of existing plant control instrumentation and sensors dedicated to the LMS system.
Exploitation of the complete system is anticipated in an advanced LMS system in power stations and chemical plants, and as part of an expert system for plant maintenance.
In addition the individual modules have promising applications:
as a design tool for evaluating the effect of a large number of different transients on a component;
as a stress management system for monitoring thermal stress online in conventional boilers with accelerated start up regimes or in gas turbine powered heat recovery boilers;
in nuclear applications such as pressurised water reactors (PWR) where creep is not a problem.
The advanced lifetime monitoring system will be capable of automatic, real-time estimation of the remnant lifetime taking into account external loads.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- natural sciences computer and information sciences software
- natural sciences computer and information sciences artificial intelligence expert systems
- engineering and technology electrical engineering, electronic engineering, information engineering electronic engineering sensors
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Coordinator
45138 Essen
Germany
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