Thermal and stress analyses of a novel coated steam dual pipe system for use in advanced ultra-supercritical power plant

Xiaofeng Guo*, Wei Sun, Adib Becker, Andy Morris, Martyn Pavier, Peter Flewitt, Michael Tierney, Christopher Wales

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

14 Citations (Scopus)
44 Downloads (Pure)


Improving the energy efficiency of advanced ultra-supercritical power plants, by increasing steam operating temperature up to 700 °C, can be achieved, at reduced cost, by using novel engineering design concepts, such as coated steam pipe systems manufactured from high temperature materials commonly used in current operational power plants. This paper describes a preliminary feasibility analysis of the design concept of a novel coated dual pipe system under steady-state operation, using analytical and finite element models to evaluate the possible thermal gradients and stresses generated. The results show that the protective coating layer contributes to the effective reduction in the surface temperature of the primary steel pipe. Thermal stresses generated due to the significant difference in the thermal and mechanical properties of the coating and substrate pipe are larger than the mechanical stresses generated by the combined effects of the internal steam pressure in the primary steam pipe and external pressure from the counter-flow cooling steam during steady-state operation. Compared with the stress relaxation of the coating and substrate pipe, creep has a significant impact on the stress distribution within the coating layer. Several key factors have been identified, such as the coating thickness, conductivity, thermal expansion, heat transfer coefficient of cooling steam, cooling steam temperature and cooling steam pressure, which are found to govern thermal and stress distributions during steady-state operation.

Original languageEnglish
Article number103933
Number of pages11
JournalInternational Journal of Pressure Vessels and Piping
Early online date13 Jul 2019
Publication statusPublished - 1 Sept 2019


  • Creep
  • Thermal and stress analyses
  • Dual pipe system
  • Thermal barrier coating
  • Advanced ultra-supercritical


Dive into the research topics of 'Thermal and stress analyses of a novel coated steam dual pipe system for use in advanced ultra-supercritical power plant'. Together they form a unique fingerprint.

Cite this