Comparative Study on Remaining Life Assessment of a Pressure Vessel, Working in Severe Conditions, Based on Results of Metallographic Replicas and Creep Tests

Abstract:

The paper presents and compares the results on the reliability and remaining life assessment of a reactor (coxing box) from a petrochemical plant. The reactor shell is made of 16Mo5 (W1.5423) steel, with a thickness of 25 mm, plated with 3 mm thick X6CrAl13 (W1.4002) stainless steel. The assessment was made in two steps. For preliminary remnant life assessment, specifications of section VII of the ASME code was used followed by iRiS‑Thermo expert system. Further, experimental creep and metallographic replica analysis were performed. Results comparison of the two methods applied revealed a reduction of the preliminary estimated remaining live obtained using metallographic replica analysis. Based on the results obtained, the possibility to extend the service duration of the coxing box in the safety condition, using current process parameters, with of 20.000 hours was highlighted.

• Periodical: Advanced Materials Research (Volume 1164)
• Pages: 67-75
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.1164.67
• Online since: June 2021
• Authors: Iuliana Duma*, Alin Constantin Murariu, Aurel Valentin Bîrdeanu, Radu Nicolae Popescu
• Keywords: Coxing Box, Expert System, Plated Shell, Reliability, Remaining Life Assessment

References

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[4] * * * ASTM E 606: Constant amplitude low-cycle fatigue testing.

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[6] * * * ASTM E 739-06: Statistical analysis of linear or linearized stress-life (S-N) and strain-life (e-N) fatigue data.